While SN 1991bg is an unusual type Ia SN in such a feature as the brief duration of the photospheric

Feb 13, 2008 ... The new method they used provides great future promise for ... The supernova, known as SN 2007on, was identified as a Type Ia supernova. ...

users only when distances are based on Type Ia Supernova (SNIa), Type II Supernova optical (SNII optical), or Type II Supernova radio (SNII radio) methods, stating which SN...

The validity of carbon-deflagration models white dwarf models for type Ia supernovae is investigated

The Canada-France-Hawaii Telescope Supernova Legacy Survey (CFHT SNLS) has created a large homogeneous database of intermediate redshift (0.2 < z < 1.0) type Ia supernovae (SNe Ia). The SNLS team has shown that correlations exist between SN Ia rates, properties, and ...

We analyze the influence of the evolution of light absorption by gray dust in the host galaxies of type Ia supernovae (SN Ia) and the evolution of the mean combined mass of close-binary carbon-oxygen white dwarfs merging due to gravitational waves (SN Ia precursors) on the ...

Recent analyses of the rise-times of Type Ia supernovae (SNe Ia) have suggested that there may exist two distinct populations of SNe Ia. In order to help resolve the controversy, we use the Schwarz Information Criterion (SIC) to quantify the belief that SN Ia rise-times are ...

SNLS1 � SN Ia Hubble Diagram M = 0.263 � 0.042 (stat) � 0.032 (sys) =-1.02 � 0.09 (stat) � 0.054 (sysThe Supernova Legacy Survey:The Supernova Legacy Survey: Dark Energy and SNe IaDark Energy and SNe Ia Mark SullivanMark Sullivan University of OxfordUniversity of ...

Type Ia Supernova (SN Ia) are a powerful, albeit not completely understood, tool for cosmology. Gaps in our understanding of their progenitors and detailed physics can lead to systematic errors in the cosmological distances they measure. We use UV data in two context to help further our understanding of ...

Optical photometry for 185 Supernovae Type Ia (SN Ia) from the F. L. Whipple Observatory is presented, more than doubling the nearby sample. Over 11500 CCD observations were acquired during the years 2001-2008. Our photometry is internally consistent and agrees to a few hundredths mag with that of other groups in ...

We present an analysis of supernova (SN) light curves simulated for the upcoming Dark Energy Survey (DES). We employed a code suite (SNANA) that generates and fits realistic SN light curves. We forecast that the DES sample of well measured Type Ia supernovae (SNe Ia) will ...

The Dark Energy Survey (DES) will conduct a dedicated Supernova Survey to discover and obtain multi-band light curves of Type Ia supernovae over a broad redshift range of 0.1 < z < 1. We describe our hybrid survey strategy that targets both high-redshift SN Ia for improved constraints on ...

The Type Ia supernova science working group of the Palomar Transient Factory (ATEL#1964) reports the discovery of the Type Ia supernova PTF10mwb. A spectrum of PTF10mwb was taken on Gemini North on June 30 UT. The redshift is approximately z=0.03 ± 0.01, from a fit to the SN. Matches to ...

The discovery of SN 2002ic by the Supernova Factory and the subsequent spectroscopic studies have led to the surprising finding that SN 2002ic is a type Ia supernova with strong ejecta-circumstellar interaction. Here we show that nearly 1 year after the explosion the ...

The Nearby Supernova Factory reports that a preliminary spectrum (range 320-1000 nm) of SN 2005eu (IAUC #8611), obtained Oct 6.5 UT with the Supernova Integral Field Spectrograph (SNIFS) on the University of Hawaii 2.2- meter telescope exhibits weak Si II 6100 AA absorption, Ca II IR triplet and S II "W." The ...

We develop a method to measure the strength of the absorption features in type Ia supernova (SN Ia) spectra and use it to make a quantitative comparisons between the spectra of type Ia supernovae at low and high redshifts. In this case study, we apply the method to 12 ...

The host galaxy environments of type Ia supernovae (SNe Ia) provide our best opportunity for constraining the mechanism(s) of the SN Ia progenitor system, i.e., the stars involved, the incubation times, and the sensitivity of SNe Ia to changes in the local gas-phase ...

TypeIa supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe. Among the most important unsolved questions about supernovae are how the explosion actually proceeds and ...

Type Ia supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe. Among the most important unsolved questions about supernovae are how the explosion actually proceeds ...

We used 3 years of SuperNova Legacy Survey (SNLS) data to constraint the SN Ia progenitor scenarios. We searched for an excess in the early portion of SNLS lightcurves, signature of shocking by a companion, as predicted in Kasen 2010. We find no evidence of such excess and we are able to constrain the contribution of single degenerate ...

The author presents new measurements of the type Ia SN rate from the SDSS-II Supernova Survey. The SDSS-II Supernova Survey was carried out during the Fall months (Sept.-Nov.) of 2005-2007 and discovered {approx} 500 spectroscopically confirmed SNe Ia with densely sampled (once every {approx} 4 ...

UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found to be underluminous compared to ``normal'' Type Ia ...

Multiple outbursts of type Ia SNe in one galaxy present a unique opportunity to study the homogeneity of these objects. NGC 3147 is only the second known galaxy with three SNe Ia, another one is NGC 1316. We present CCD UBVRI photometry for SN Ia 2008fv and compare the light and color curves of this object to those ...

We show that when a procedure is made to remove the tension between a supernova Ia (SN Ia) data set and observations from BAO and CMB, there might be the case where the same SN Ia set built with two different light-curve fitters behaves as two separate and distinct ...

Physical models of Type Ia supernovae (SN Ia) that do not depend on secondary calibrators have indicated that the Hubble Constant must be about 65 km/s/Mpc for well over a decade with the range of uncertainty shrinking with the sophistication of the models. This estimate is in good agreement with those based on HST ...

The nature of Type Ia supernova (SN Ia) explosions has not yet been clarified, despite their importance in astrophysics and cosmology. Recent theoretical investigations suggest that asymmetric distribution of initial thermonuclear sparks may be a key in the SN Ia explosion ...

We present a new dataset of low-redshift nearby-Hubble-flow Type Ia supernova (SN Ia), a new compilation of the world's SN Ia datasets and new analysis procedures to work with these heterogeneous compilations. This ``Union'' compilation of nearly 400 SN ...

We present measurements of the Type Ia supernova rate in both high-redshift galaxy clusters and the field. For the first time, we detect a significant increase in the cluster rate with redshift, when compared to lower-redshift measurements. Our field rate measurement indicates an SN Ia rate that is flat or ...

We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of supernovae (SNe) includes 516 SNe Ia at redshift z <~ 0.3, of which ...

In recent years, type Ia supernovae (SNe Ia) have been used successfully as cosmological probes of the Universe. However, the nature of their progenitors has remained somewhat of a mystery. It is widely accepted that they represent the disruption of a degenerate object, but there are also numerous progenitor models, but most of these ...

A spherically symmetric hydrodynamic code is used to study the evolution of a young supernova remnant on the basis of a carbon deflagration model for type Ia supernovae. The nonequilibrium X-ray emission has been determined for the elemental composition of the model. The discrepancy between the derived intensity of the Fe D-alpha line ...

Increasingly large photometric surveys of transient phenomena, such as Pan-STARRS, DES and LSST, will locate thousands to millions of SNe Ia candidates per year, a rate prohibitive for acquiring spectroscopy to determine each candidate's type and redshift. Multiple supernova photometric classification/photo-z algorithms have been developed in recent years ...

We discuss the expansion velocities of different elements in the ejecta of the intermediate--z Type Ia supernovae (SNe Ia) discovered as a part of the International Time Programme (ITP) project ``? and ? from Supernovae and the Physics of Supernovae Explosions'' at the European Northern ...

The purpose of this work is the computation of the cosmic Type Ia supernova rates, namely the frequency of Type Ia supernovae per unit time in a unitary volume of the Universe. Our main goal in this work is to predict the Type Ia supernova rates at very high redshifts and ...

We explore the relationship between the models for progenitor systems of Type Ia supernovae and the properties of the supernova remnants that evolve after the explosion. Most models for Type Ia progenitors in the single-degenerate scenario predict substantial outflows during the presupernova evolution. Expanding on ...

The remarkable uniformity of Type Ia supernovae has allowed astronomers to use them as distance indicators to measure the properties and expansion history of the Universe. However, Type Ia supernovae exhibit intrinsic variation in both their spectra and observed brightness. The brightness variations have been ...

Using light curves and host galaxy spectra of 101 Type Ia supernovae (SNe Ia) with redshift z {approx}< 0.3 from the Sloan Digital Sky Survey Supernova Survey (SDSS-SN), we derive the SN Ia rate as a function of progenitor age (the delay time ...

I have constructed a comprehensive statistical model for Type Ia supernova light curves spanning optical through near infrared data simultaneously. The near infrared light curves are found to be excellent standard candles (sigma(MH) = 0.11 +/- 0.03 mag) that are less vulnerable to systematic error from dust extinction, a major confounding factor for ...

The type Ia supernova (SN Ia) rate in galaxy clusters can be a powerful probe of both the SN Ia progenitor system and the intracluster medium of the clusters themselves. The cluster SN Ia rate has recently been measured at redshifts ...

We present a measurement of the rate of high-z Type Ia supernovae (SNe Ia) using multi-epoch observations of Subaru/XMM-Newton Deep Field (SXDF) with Suprime-Cam on the Subaru Telescope. Although SNe Ia are regarded as a standard candle, progenitor systems of SNe Ia have not been resolved yet. ...

Stars that explode as supernovae come in two main classes. A type Ia supernova is recognized by the absence of hydrogen and the presence of elements such as silicon and sulphur in its spectrum; this class of supernova is thought to produce the majority of iron-peak elements in the Universe. They are also used as ...

The light curve of SN 1572 is described in the terms used nowadays to characterize Type Ia supernovae (SNe Ia). By assembling the records of the observations done in 1572-1574 and evaluating their uncertainties, it is possible to recover the light curve and the color evolution of this ...

The observations of Type Ia supernovae (SN Ia), Baryon Acoustic Oscillations (BAO) and Cosmic Microwave Background radiation (CMB) provide powerful tools for the measurement of cosmological parameters. One of the most useful information encodes in the distance measured by those probes. In this Letter, we test the ...

We present multi-band photometry and multi-epoch spectroscopy of the peculiar Type Ia supernova (SN Ia) 2007qd, discovered by the SDSS-II Supernova Survey. It possesses physical properties intermediate to those of the peculiar SN 2002cx and the extremely low-luminosity ...

Optical light curves and spectra of the Type Ia supernovae 1986G in NGC5128 (Centaurus A) are presented. SN 1986G was discovered approximately one week before maximum light. The initial rate of decline of the B light curve was remarkably fast and characte...

SN 1006 is one of the supernova remnants (SNR) recorded in the Japanese diary 'Meigetsuki'. From the historical records including Meigetsuki, we conclude that SN 1006 was the brightest type Ia supernova remnant. We report on the observations of SN 1006 ...

Some calculations relevant to {gamma}-ray astronomy, carried out by the author and his collaborators, are reported: limits on the amounts of {sup 57}Ni and {sup 44}Ti in SN1987A and other similar Type II explosions; nucleosynthesis of {sup 26}Al in massive stars and supernovae; the delayed denotation model for Type Ia ...

As part of our ongoing program to investigate X-ray emission from supernovae with Chandra, we triggered 10-ksec Chandra ToO observations of the Type IIb supernova 2011dh (ATel #3398, CBET #2736) and the Type Ia SN 2011by (CBET #2708). We confirm that the X-ray emission detected with Swift/XRT (ATel #3400, #3414) ...

The basic features and astrophysics of supernovae of types Ia, Ib, and II and of SNRs are discussed,

Aims: We present the first theoretical SN Ia light curves calculated with the time-dependent version of the general purpose model atmosphere code PHOENIX. Our goal is to produce light curves and spectra of hydro models of all types of supernovae. Methods: We extend our model atmosphere code PHOENIX to calculate type ...

We study the effect of environment on the properties of Type Ia supernovae by analyzing the integrated spectra of 57 local Type Ia supernova host galaxies. We deduce from the spectra the metallicity, current star formation rate, and star formation history of the host and compare these to the ...

For my Astronomy Ph.D. thesis at Harvard University, I used the PAIRITEL 1.3m robotic telescope at the Fred Lawrence Whipple Observatory on Mt. Hopkins, Arizona to observe Near-Infrared (NIR) JHKs band light curves of over 100 Type Ia Supernovae (SN Ia) in nearby galaxies, compiling a data set that will more than ...

We analyse behavior of stellar winds of evolved stars and the outcome of SN Ia explosions in the AGN driven relativistic bubble. We find that the expansion of wind shells is efficiently decelerated by the relativistic pressure; their bulk motion however is preserved so they cross the bubble together with the parent star. The wind material occupies a small ...

We describe a database of 431 low-dispersion optical spectra of 32 Type Ia supernovae (SNe Ia) that also have well-calibrated light curves. The coverage ranges from 6 epochs to 36 epochs of spectroscopy per SN, with over 200 spectra within 14 days of maximum. The consistency of the method of observation and the ...

The time delay between the formation of a population of stars and the onset of type Ia supernovae (SNe Ia) sets important limits on the masses and nature of SN Ia progenitors. Here, we use a new observational technique to measure this time delay by comparing the spatial distributions of SNe ...

Optical spectroscopy and photometry of the Type Ia supernova SN 1988G obtained shortly after dicovery are presented. The redshift of the parent galaxy is determined to be 7055 km/sec. Adopting a distance of 88 Mpc, the supernova has an absolute magnitude of M(B) = -18.8. Based on the luminosity and the ...

We present an analysis of the host galaxy dependencies of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We re-discover, to high significance, the strong correlation between host galaxy type and the width of the observed SN light curve, i.e., ...

We present an analysis of the host galaxy dependences of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We re-discover, to high significance, the strong correlation between host galaxy type and the width of the observed SN light curve, i.e., ...

We present an analysis of the host galaxy dependences of Type Ia Supernovae (SNe Ia) from the full three year sample of the SDSS-II Supernova Survey. We re-discover, to high significance, the strong correlation between host galaxy type and the width of the observed SN light curve, i.e., ...

Type Ia Supernovae (SNe Ia) have high and homogeneous luminosities, making them an essential tool for measuring distances on a cosmic scale, useful to gauge the geometry and evolution of the Universe. However, the nature of the progenitor system of these explosions is still uncertain. The consensus view is that SNe ...

We present STRESS (Southern intermediate redshift ESO Supernova Search) a Supernova (SN) survey successfully carried out with ESO telescopes. This SN survey distinguishes itself by other ones for its main goals that are to obtain an estimate of both type Ia and core collapse ...

Atomic and molecular physics of supernovae is discussed with an emphasis on the importance of detailed treatments of the critical atomic and molecular processes with the best available atomic and molecular data. The observations of molecules in SN 1987A are interpreted through a combination of spectral and chemical modelings, leading to strong constraints ...

SN 2006bt displays characteristics unlike those of any other known Type Ia supernova (SN Ia). We present optical light curves and spectra of SN 2006bt which demonstrate the peculiar nature of this object. SN 2006bt has broad, slowly declining light ...

Brighter Type Ia supernovae (SNe Ia) have broader, more slowly declining B-band light curves than dimmer SNe Ia. We study the physical origin of this width-luminosity relation (WLR) using detailed radiative transfer calculations of Chandrasekhar-mass SN Ia models. We find ...

With the advent of large dedicated Type Ia supernova (SN Ia) surveys, K-corrections of SNe Ia and their uncertainties have become especially important in the determination of cosmological parameters. While K-corrections are largely driven by SN Ia ...

Context. The Sloan Digital Sky Survey II (SDSS-II) Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of type Ia supernovae around z ~ 0.2, the redshift "gap" between low-z and high-z supernova searches. The survey has provided multi-band (ugriz) photometric lightcurves for ...

The use of type Ia supernova (SN Ia) as standard candles has shifted from testing whether the Universe is accelerating to making a precision measurement of the dark energy equation of state to test the current Lambda-CDM paradigm. However, we still lack a clear understanding of the SN ...

From the well-sampled light curves, we find that SN 2005cf reached a B-band maximum ... The UV light curves show similar evolution to the broadband ...

Staff Sunfall Documents For Students Internal Links Contact Type Ia Reddening Law paper by N. Chotard et al. 2011, A&A, 529, 4 SN2007if Host Properties paper by M. Childress...

We present extensive u{prime}g{prime}r{prime}i{prime} BV RIY JHK{sub s} photometry and optical spectroscopy of SN 2005hk. These data reveal that SN 2005hk was nearly identical in its observed properties to SN 2002cx, which has been called 'the most peculiar known type Ia ...

A decade ago, two teams studying distant type Ia supernovae discovered that the expansion of the Universe is speeding up, at odds with the expectation that gravity would gradually slow it down. Since then, supernova surveys from the ground and from space have brought tremendous improvements in the quality and quantity of ...

We computed optical and infrared light curves of the pulsating class of delayed detonation models for Type Ia supernovae (SNe Ia). It is demonstrated that observations of the IR light curves can be used to identify subluminous SNe Ia by testing whether secondary maxima occur in the IR. Our pulsating delayed ...

We present an updated version of the Multicolor Light Curve Shape method to measure distances to type Ia supernovae (SN Ia), incorporating new procedures for K-correction and extinction corrections. We also develop a simple model to disentangle intrinsic color variations and reddening by dust, and expand the method ...

We performed the Southern inTermediate Redshift ESO Supernova Search (STRESS), a survey specifically designed to measure the rate of both SNe Ia and CC SNe, in order to obtain a direct comparison of the high redshift and local rates and to investigate the dependence of the rates on specific galaxy properties, most notably their colour. We found that the ...

We analyse the behaviour of the stellar winds of evolved stars and the outcome of Type Ia supernova (SN) explosions in a relativistic bubble driven by active galactic nuclei (AGNs). We find that the expansion of wind shells is efficiently decelerated by the relativistic pressure; however, their bulk motion is preserved, so they cross ...

Type Ia supernovae (SNe Ia) are excellent tools in cosmology. Their intrinsic luminosities are found to vary systematically with the light-curve widths, providing an empirical calibration. This property, called the width-luminosity relation (WLR), is the basis of modern SN Ia cosmology and led ...

Because Type Ia supernovae (SNe Ia) are not perfect standard candles, it is important to be able to use distance--independent observables (DIOs) to define subsets of SNe Ia that are "nearly standard candles" or to correct SN Ia absolute magnitudes to make them nearly ...

We present Keck optical spectra of SN 2002cx, the most peculiar known Type Ia supernova (SN Ia), taken 227 and 277 days past maximum light. Astonishingly, the spectra are not dominated by the forbidden emission lines of iron that are a hallmark of thermonuclear SNe in the nebular phase. ...

Type Ia Supernova (SN Ia) are a powerful, albeit not completely understood, tool for cosmology. Gaps in our understanding of their progenitors and detailed physics can lead to systematic errors in the cosmological distances they measure. We use UV data in two context to help further our understanding of ...

We still lack knowledge about the origin of thermonuclear supernovae (SN Ia) despite their huge cosmological and galactochemical importance. It seems likely that the evolution leading up to the SN Ia explosion involves mass transfer from a companion star onto the progenitor white dwarf. ...

The rate of occurrence of supernovae (SNe) is linked to some of the basic ingredients of galaxy evolution, such as the star formation rate, the chemical enrichment and feedback processes. SN rates at intermediate redshift and their dependence on specific galaxy properties have been investigated in the Southern inTermediate Redshift ESO ...

The historical supernova remnant (SNR) Tycho SN 1572 originates from the explosion of a normal Type Ia supernova that is believed to have originated from a carbon-oxygen white dwarf in a binary system. We analyze the 21 cm continuum, H I, and 12CO-line data from the Canadian Galactic Plane Survey in the direction ...

We present early-time optical and near-infrared photometry of supernova (SN) 2005cf. The observations, spanning a period from about 12 d before to 3 months after maximum, have been obtained through the coordination of observational efforts of various nodes of the European Supernova Collaboration and including data obtained at the 2-m ...

The thermonuclear explosion of a C/O white dwarf as a Type Ia supernova (SN Ia) generates a kinetic energy comparable to that released by a massive star during a SN II event. Current observations and theoretical models have established that SNe Ia are asymmetric, and ...

The thermonuclear explosion of a C/O white dwarf as a Type Ia supernova (SN Ia) generates a kinetic energy comparable to that released by a massive star during a SN II event. Current observations and theoretical models have established that SNe Ia are asymmetric, and ...

An analysis of the effect of microlensing by a cosmologically dominant density of compact objects is performed, using high-redshift Type Ia supernovae (SN Ia's) as probes. The compact objects are modeled as a three-dimensional distribution of point masses, and Monte Carlo simulations are done to calculate ...

We propose to study the physics of type Ia supernovae at late and very-late phases of their evolution. Type Ia events synthesize radioactive elements that keep the expanding debris glowing for years after the explosion. Our Spitzer observations combined with archival images show a wide range of mid-IR luminosities between 100 and 200 ...

The largely unknown type Ia supernova mechanism remains one of the largest sources of possible systematic uncertainty in achieving precise measures of dark energy. The host galaxy environments of SNe Ia provide our best opportunity for constraining the mechanism(s) of the SN Ia progenitor ...

We present the results of an analysis of the world SNe data, complemented by a new dataset of low-redshift nearby-Hubble-flow SN Ia. This "Union" compilation of nearly 400 SN Ia includes the recent large samples of SNe Ia from the Supernova Legacy Survey and the ESSENCE ...

Spectroscopic analyses of Type Ia supernovae have shown that there exist four spectroscopic groups-cool, broad line, shallow silicon, and core normal-defined by the widths of the Si II features ?5972 and ?6355. The 1991bg-like SNe Ia are classified as "cool." Cool SNe Ia are dim, undergo ...

We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains the largest number of homogeneously observed and reduced nearby SNe ...

We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains the largest number of homogeneously observed and reduced nearby SNe ...

Recent applications of type Ia supernovae (SNe Ia) in cosmology have successfully revealed the accelerating expansion of the universe. However, as distance indicators used in measuring the expansion history of the universe and probing the nature of dark energy, these objects must pass more strict tests. We propose a K-S test to ...

We argue here that models of SN Ia based on gravitational collapse with the ejection of only a small amount of matter and nickel will be subluminous, and are likely to have problems with the light curve and especially with the spectral evolution. Canonical thermonuclear explosion models can account for the light curves not only in the optical but in the IR ...

We analyze the three-year Sloan Digital Sky Survey II (SDSS-II) Supernova (SN) Survey data and identify a sample of 1070 photometric Type Ia supernova (SN Ia) candidates based on their multiband light curve data. This sample consists of SN candidates ...

We present a measurement of the volumetric Type Ia supernova (SN Ia) rate based on data from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The adopted sample of supernovae (SNe) includes 516 SNe Ia at redshift z {approx}< 0.3, of ...

As announced in CBET 1521 (Monard and Morrell; Daniel W.E. Green, editor), SN 2008fw, a supernova of type Ia, has been discovered in the spiral galaxy NGC 3261 by L.A.G. "Berto" Monard of South Africa. The most recent observation placed the supernova at an unfiltered magnitude of 14.2 on 2008 September 26.123 UT. ...

We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement of the detection efficiency, using a Monte Carlo simulation, provides the type Ia supernova ...

We report the successful identification of the type of the supernova responsible for the supernova remnant SNR 0509-675 in the Large Magellanic Cloud (LMC) using Gemini spectra of surrounding light echoes. The ability to classify outbursts associated with centuries-old remnants provides a new window into several aspects of supernova ...

Our lack of understanding of Type Ia supernova {SN Ia} explosions limits our confidence in their use for cosmology. While there is broad agreement that these objects represent the explosions of white dwarfs, the details of the explosion mechanism are not well-understood. Recently, we have identified an internally ...

Throughout history, observational supernova studies have focused almost exclusively on their strong optical emission powered by the radioactive decay of Nickel. Yet many of the leading breakthroughs in our understanding of supernovae and their progenitors have been enabled by observations at other wavelengths. In particular, X-ray observations of young ...

Observation of SN 19841 in the Sc galaxy ESO 323-G99 are presented. This object was discovered about 15 days before maximum light and was observed photometrically over a period of five weeks. A spectrum obtained near maximum shows that this supernova was a relatively distant Type-Ib event. Like other Type-Ib supernovae, 19841 was ...

The nature of the 'delayed detonation' mechanism of Khokhlov for the explosion of Type Ia supernovae

This interactive feature details the demise of a two-star system and its concluding event, a Type Ia supernova.

We discuss the comprehensive analysis of spectrophotometric time-series observations of the Type Ia supernova SNF20080514-002. The data consist of 20 SuperNova Integral Field Spectrograph (SNIFS) spectra sampled over 50 days, commencing at 10 days before peak brightness. The analysis is part of a systematic effort to map out the ...

Using data drawn from the Sloan Digital Sky Survey and the SDSS-II Supernova Survey, we study the local environments of confirmed type Ia supernovae (SNe Ia) in the nearby universe. At 0.05 < z < 0.15, we find that SN Ia events in blue, star-forming galaxies ...

We present a comprehensive statistical analysis of the properties of Type Ia supernova (SN Ia) light curves in the near-infrared using recent data from Peters Automated InfraRed Imaging TELescope and the literature. We construct a hierarchical Bayesian framework, incorporating several uncertainties including ...

We use models of the rates of Type Ia supernovae (SNe Ia) and core-collapsed supernovae, built in such a way that both are consistent with recent observational constraints at z<~ 1.6 and can reproduce the measured cosmic star formation rate, to recover the history of metal accumulation in the intracluster ...

The element abundance distributions in the ejecta of Type Ia supernova (SN) is studied by modelling a time series of optical spectra of SN 2003du until �1 yr after the explosion. Since SN 2003du is a very normal Type Ia SN both photometrically and ...

We present mid-infrared (5.2-15.2 ?m) spectra of the Type Ia supernovae (SNe Ia) 2003hv and 2005df observed with the Spitzer Space Telescope. These are the first observed mid-infrared spectra of thermonuclear supernovae, and show strong emission from fine-structure lines of Ni, Co, S, and Ar. The detection of Ni ...

We have obtained 1087 NIR (JHKs) measurements of 21 SNe Ia using PAIRITEL, nearly doubling the number of well-sampled NIR SN Ia light curves. These data strengthen the evidence that SNe Ia are excellent standard candles in the NIR, even without correction for optical light-curve shape. We construct fiducial NIR ...

Aims: We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the ESO/VLT during the first three years of the Canada-France-Hawa� Telescope (CFHT) supernova legacy survey (SNLS). This homogeneous data set is used to test for redshift evolution of SN ...

High-quality observations of B and V light curves obtained at Las Campanas Observatory for local Type Ia Supernovae (SNe Ia) show clear evidence that SNe Ia with the same brightness decline or stretch may have systematic and independent deviations at times t {approx}< 5 days before and at times t ...

This paper presents spectroscopy of supernovae discovered in the first season of the Sloan Digital Sky Survey-II Supernova Survey. This program searches for and measures multi-band light curves of supernovae in the redshift range z = 0.05-0.4, complementing existing surveys at lower and higher redshifts. Our goal is to better ...

We present an analysis of the rise-time distribution of nearby (z< 0.05) Type Ia supernovae (SNe Ia). Drawing mostly from the recently published Lick Observatory Supernova Search (LOSS) SN Ia sample along with other published nearby SNe Ia with data ...

The high-redshift SN Ia data are taken from the SNLS. This programme used optical imaging data taken as part of the deep component of the five-year Canada-France-Hawaii Telescope Legacy Survey (CFHT-LS) using the square-degree 'MegaCam' camera, located in the prime focus environment 'MegaPrime' on the CFHT. (1 data file).

2006 astro-ph/0502262 Probing the curvature and dark energy Yungui Gong College of Electronic dark energy representations ! = ! 0 =(1 + z) and ! = ! 0 e z=(1+z) =(1 + z) are used to probe the geometry of the Universe and the property of dark energy. The combined type Ia supernova (SN Ia), Sloan

We present initial results from the IfA Deep Survey, a survey carried out during the fall and winter of 2001/2002 which included a supernova search component. Over the course of approximately 6 months fields with an area of 2.5 square degrees were observed typically 15 times in multiple colors (RIZ) with wide-field imagers atop Mauna Kea, Hawaii. The continuous nature of the ...

We present the discovery, photometric, and spectroscopic follow-up observations of SN 2010X (PTF 10bhp). This supernova decays exponentially with ? d = 5 days and rivals the current recordholder in speed, SN 2002bj. SN 2010X peaks at M r = -17 mag and has mean velocities of 10,000 km s-1. Our light curve ...

We present four spectra of the Type Ia supernova SN Ia 2006Dextending from -7 to +13 days with respect to B-band maximum. The spectrainclude the strongest signature of unburned material at photosphericvelocities observed in a SN Ia to date. The earliest spectrum exhibits ...

For more than a decade observations and analyses of type Ia supernova (SNe Ia) explosions have resulted in profound insights into the nature of our universe. However, in spite of the amazing discoveries, the list of fundamental things that we still do not understand about SNe Ia is quite long. We attempt to address ...

The Type Ia supernova science working group of the Palomar Transient Factory (ATEL#1964) reports the discovery of two early Type Ia supernovae: PTF10nlg and PTF10ndc. PTF 10nlg is located at RA=16:50:34.48, DEC=+60:16:35.0 (J2000). It was discovered July 2 (all dates UT) on the Palomar 48 inch at approximately ...

We continue and extend studies of the late light curves of nearby Type Ia supernovae in the optical and near-infrared. Our goal is to measure the color evolution to late enough epochs to measure the shift of power (as seen already in a few Supernovae) into the near infrared, and perhaps observe the as yet unobserved subsequent decline ...

Analysis of spatially resolved ASCA spectra of the intracluster gas in Abell 496 confirms there are mild metal abundance enhancements near the center, as previously found in a joint analysis of spectra from Ginga Large Area Counter and Einstein solid state spectrometer. Simultaneous analysis of spectra from all ASCA instruments (SIS+GIS) shows that the iron abundance is 0.36+/-0.03 solar 3'-12' ...

We propose to continue our calibration experiment for M{max} of type Ia supernovae {SNe Ia} by determining Cepheid distances to their parent galaxies. To date we have completed the calibration for 6 SNe Ia, from Cycles 1, and 3 - 5. The results for 5 SNe Ia have been published in extenso. A ...

Late-time (t ~ 300 d) observation of near-infrared (NIR) [Fe II] lines has proven to be a very powerful tool for probing the physics of Type Ia supernova (SN Ia) explosions. The few available examples have revealed that at least some SNe Ia exhibit a layered ejecta structure which persists down ...

Context. The SDSS-II Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of Type Ia supernovae (SNe Ia) around z~0.2, the redshift �gap� between low-z and high-z SN searches. The survey has provided multi-band photometric lightcurves for variable ...

We present a new method to standardize type Ia supernova (SN Ia) luminosities to ?0.13 mag using flux ratios from a single flux-calibrated spectrum per SN. Using Nearby Supernova Factory spectrophotomery of 58 SNe Ia, we performed an unbiased search for ...

When the afterglow fades at the site of a long-duration {gamma}-ray burst (LGRB), Type Ic supernovae (SN Ic) are the only type of core collapse supernova observed. Recent work found that a sample of LGRB had different environments from a collection of core-collapse supernovae identified in a high-redshift sample ...

Context. Based on the single degenerate (SD) scenario, a super-Chandrasekhar mass model derived from the rapid rotation of a progenitor star may account for the overluminous type Ia supernovae (SNe Ia) like SN 2003fg. Previous authors calculated a series of binary evolution and showed the parameter spaces for the ...

Using data from the Sloan Digital Sky Supernova Survey-II, we measure the rate of Type Ia Supernovae (SNe Ia) as a function of galaxy properties at intermediate redshift. A sample of 342 SNe Ia with 0.05<0.25 is constructed. Using broad-band photometry we use the PEGASE spectral energy ...

The Type Ia supernova science working group of the Palomar Transient Factory (ATEL#1964) reports the discovery of the Type Ia supernova PTF10ygu at RA=09:37:30.30, Dec=+23:09:33.6 (J2000) in the host galaxy NGC 2929 at z=0.025. The supernova was discovered on Oct. 12.5 UT when it was at ...

The results of the observations of the young supernova remnants are reviewed with the emphasis on the nature of supernovae. Galactic supernovae of the last millenium are shown to give the remnants of three different types: SN 1 remnants, SN 2 remnants and...

We present the first mid-infrared (5.2-15.2 micron) spectra of Type Ia supernovae (SNe 2003hv and 2005df). The detection of Ni emission in SN 2005df 135 days after the explosion provides direct observational evidence of high-density nuclear burning forming a significant amount of stable Ni in a Type Ia ...

We show that the cosmic microwave background (CMB) data of WMAP can give subelectronvolt limit on the neutrino mass. We investigate how much we can make it more stringent by using 'standard ruler' measurements such as baryon acoustic oscillation (BAO) and type Ia supernovae (SN)

19 y-1 SN Ia within D = 50 Mpc (Peak 847 keV Flux e 1.2 10-6 cm-2 s-1) ... SN Iln (bright only) D < 8 Mpc. Plan in place for extensive coverage of ...

The pre-supernova winds of type I SN are very difficult to detect: they are of low mass, rather slow (hundreds of km/s) and almost immediately swept by the SN envelope expanding at very high speed. No Type Ia supernova has ever been observed in radio. Nevertheless the SNe 1981B and 1990M give ...

Type Ia SN 2003lx was first discovered in X-ray through two serendipitous Swift observations in 2008 January and the corresponding merged image revealed a 7-sigma source detection at 2.1pm1.2 arcsec (0.9 pm 0.5 Swift pixels) from the optical position of the supernova. We propose a XMM-Newton observation of Type Ia ...

Type Ia supernovae (SNe Ia) play an important role in the study of cosmic evolution, especially in cosmology. There are several progenitor models for SNe Ia proposed in the past years. By considering the effect of accretion disk instability on the evolution of white dwarf (WD) binaries, we performed detailed binary ...

We present a study of twin supernovae with spectrophotometric timeseries of nearby Type Ia supernova from the Nearby Supernova Factory (Aldering, et al. 2002). One advantage of "twins� is they offer the best opportunity for having objects with the same intrinsic luminosities and colors, ostensibly leaving only ...

Dark energy and the accelerated expansion of the universe have been the direct predictions of the distant supernovae Ia observations which are also supported, indirectly, by the observations of the CMB anisotropies, gravitational lensing and the studies of galaxy clusters. Today these results are accommodated in what has become the concordance cosmology: a ...

Aims:To measure the supernova (SN) rates at intermediate redshift we performed a search, the Southern inTermediate Redshift ESO Supernova Search (STRESS). Unlike most of the current high redshift SN searches, this survey was specifically designed to estimate the rate for both type Ia and core ...

Advances in the measurement of cosmological parameters using Type Ia supernovae [see poster by Knop et al.] require improvements in the empirical and physical understanding of supernova peak brightnesses. The range of supernova properties must also be determined so that the effect of selection biases on future ...

Models are used to explore the outcome of explosive ignition of ONeMg cores, which result from the evolution of stars in a mass range between 8 and 10 solar masses. Arguments are presented showing that the thermonuclear supernova production or the 'iron' dwarf formation by milder outbursts are possibile outcomes of the explosive ignition of ONeMg cores. It is suggested that ...

SN 2009ku, discovered by Pan-STARRS-1, is a Type Ia supernova (SN Ia), and a member of the distinct SN 2002cx-like class of SNe Ia. Its light curves are similar to the prototypical SN 2002cx, but are slightly broader and have a ...

We analyze the rise-time of over 300 type Ia supernova light curves from the Sloan Digital Sky Survey II (SDSS-II) Supernova Survey. The SDSS-II Supernova Survey was a three-year search covering 300 square-degrees of sky every two days. The relatively low redshift of the 500 spectroscopically confirmed type ...

Type Ia Supernovae(SNe Ia) have large and very homogeneous luminosities, making them an important tool for measuring distances on a cosmic scale, helping to study the evolution of the Universe. However, the nature of the progenitor system of these explosions is still uncertain. The consensus view is that SNe Ia ...

The Supernova Acceleration Probe (SNAP) will use Type Ia supernovae (SNe Ia) as distance indicators to measure the effect of dark energy on the expansion history of the Universe. (SNAP's weak-lensing program is described in a separate White Paper.) The experiment exploits supernova ...

The distribution of absolute blue magnitudes among Type Ia supernovae (SNs Ia) is studied. Supernovae were used with well determined apparent magnitudes at maximum light and parent galaxies with relative distances determined by the Tully-Fisher or Dn - sigma techniques. The mean absolute blue magnitude is given and ...

We have obtained optical spectra of 29 early-type (E/S0) galaxies that hosted Type Ia supernovae (SNe Ia). We have measured absorption-line strengths and compared them to a grid of models to extract the relations between the supernova properties and the luminosity-weighted age/composition of the host galaxies. Such ...

One of NuSTAR's primary science goals is the detailed study of supernova explosions, both historical supernova in our Galaxy and current supernova in our local Universe. NuSTAR will directly measure the 44-Ti yield in a sample of young Galactic remnants (Cas A, Tycho) as well as SN 1987A, providing a detailed probe ...

The Palomar Transient Factory (PTF) is an astronomical wide-field survey designed to search for optical transient and variable sources. PTF began on-sky operations in early 2009. It is fully-automated, including a wide-field survey camera, an automated real-time data reduction pipeline and transient classifier, a dedicated photometric follow up telescope, and a full archive of all detected ...

The Supernova Acceleration Probe (SNAP) will use Type Ia supernovae (SNe Ia) as distance indicators to measure the effect of dark energy on the expansion history of the Universe. (SNAP's weak-lensing program is described in a separate White Paper.) The ex...

We present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (v) approaching �15,500 km s ...

We know Type Ia supernovae are thermonuclear explosions of CO white dwarfs, but we don't know the specifics of how the nuclear burning proceeds from the core outward to the surface once it starts. Thermonuclear instability in a WD core is thought to start off as a subsonic, turbulent deflagration wave or "burning" wave but then may, at some point, ...

This is the third paper of a series in which we present new measurements of the observed rates of supernovae (SNe) in the local Universe, determined from the Lick Observatory Supernova Search (LOSS). We have considered a sample of �1000 SNe and used an optimal subsample of 726 SNe (274 SNe Ia, 116 SNe Ibc and 324 SNe II) to determine ...

We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe) and its dispersion using high signal-to-noise ratio Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for ...

In this paper, we present and analyse optical photometry and spectra of the extremely luminous and slowly evolving Type Ia supernova (SN Ia) 2009dc, and offer evidence that it is a super-Chandrasekhar mass (SC) SN Ia and thus has a SC white dwarf (WD) progenitor. Optical ...

Although we know that many supernovae are aspherical, the exact nature of their geometry is undetermined. Because all the supernovae we observe are too distant to be resolved, the ejecta structure can't be directly imaged, and asymmetry must be inferred from signatures in the spectral features and polarization of the supernova ...

Although we know that many supernovae are aspherical, the exact nature of their geometry is undetermined. Because all the supernovae we observe are too distant to be resolved, the ejecta structure can't be directly imaged, and asymmetry must be inferred from signatures in the spectral features and polarization of the supernova light. ...

This paper exploits the gravitational magnification of Type Ia supernovae (SNe Ia) to measure properties of dark matter haloes. Gravitationally magnified and de-magnified SNe Ia should be brighter and fainter than average, respectively. The magnification of individual SNe Ia can be computed ...

The Type Ia supernova (SN Ia) rate, when compared to the cosmic star formation history (SFH), can be used to derive the delay-time distribution (DTD; the hypothetical SN Ia rate versus time following a brief burst of star formation) of SNe Ia, which can ...

Timmes et al. found that metallicity variations could theoretically account for a 25% variation in the mass of 56Ni synthesized in Type Ia supernovae (SNe Ia), and thus account for a large fraction of the scatter in observed SN Ia luminosities. Higher-metallicity progenitors are more neutron ...

We report results from the Supernova Photometric Classification Challenge (SNPhotCC), a publicly released mix of simulated supernovae (SNe), with types (Ia, Ibc, and II) selected in proportion to their expected rates. The simulation was realized in the g r i z filters of the Dark Energy Survey (DES) with realistic observing conditions ...

Type Ia supernovae (SNe Ia) are good cosmological distance indicators due to their high luminosities and remarkable uniformity, and thus are used for determining cosmological parameters. However, several key issues related to the nature of their progenitor systems are still not well understood. In this thesis, the progenitors of SNe ...

This paper presents an LTE analysis of the photospheric epoch optical and IUE UV spectra of the recent Type Ia supernovae SN 1990N and SN 1991T. It is found that SN 1990N has matter moving as fast as 40,000 km/s, while SN 1991T has matter moving as fast as 20,000 km/s. The ...

We use multi-wavelength, matched aperture, integrated photometry from the Galaxy Evolution Explorer (GALEX), the Sloan Digital Sky Survey, and the RC3 to estimate the physical properties of 166 nearby galaxies hosting 168 well-observed Type Ia supernovae (SNe Ia). The ultraviolet (UV) imaging of local SN ...

We use multi-wavelength, matched aperture, integrated photometry from the Galaxy Evolution Explorer (GALEX), the Sloan Digital Sky Survey, and the RC3 to estimate the physical properties of 166 nearby galaxies hosting 168 well-observed Type Ia supernovae (SNe Ia). The ultraviolet (UV) imaging of local SN ...

The single-degenerate model is the most widely accepted progenitor model of Type Ia supernovae (SNe Ia), where a carbon-oxygen white dwarf (CO WD) accretes hydrogen-rich material from its companion to increase its mass. The companion may be a main-sequence (MS) star or a subgiant star (WD + MS). When the CO WD approaches the ...

I observed the peculiar SN 2008ha (CBET #1567) with the Very Large Array on 2008 Nov 21.99 UT at a frequency of 8.46 GHz. No radio source is detected at the optical SN position to a limit of 93 microJy (3 sigma). At a distance of 21 Mpc, this corresponds to a radio luminosity limit similar to those of nearby Type Ia ...

A search for cosmological supernovae has discovered a number of a type Ia supernovae. In particular, one at z = 0.458 is the most distant supernovae yet observed. There is strong evidence from measurements of nearby type Ia supernovae that they can be con...

The single-degenerate (SD) channel for the progenitors of type Ia supernovae (SNe Ia) is one of the most popular channels, in which a carbon-oxygen white dwarf (CO WD) accretes hydrogen-rich material from its companion, increases its mass to the Chandrasekhar mass limit, and then explodes as a SN ...

Large photometric surveys of transient phenomena, such as Panoramic Survey Telescope and Rapid Response System and Large Synoptic Survey Telescope, will locate thousands to millions of Type Ia supernova (SN Ia) candidates per year, a rate prohibitive for acquiring spectroscopy to determine each candidate's ...

With a redshift of z {approx} 1.7, SN 1997ff is the most distant type Ia supernova discovered so far. This SN is close to several bright, z = 0.6-0.9 galaxies, and we consider the effects of lensing by those objects on the magnitude of SN 1997ff. We estimate their velocity dispersions using the ...

We report photometric observations of two nearby type Ia supernovae, SN 1994ae and SN 1998aq, and the farthest direct observations of Cepheids, using the Advanced Camera for Surveys on HST. Both of these SNe Ia are spectroscopically and photometrically normal with low-reddening, precise and ...

We report the independent discovery and follow-up observations of supernova 2005gj by the Nearby Supernova Factory. This is the second confirmed case of a ''hybrid'' Type Ia/IIn supernova, which like the prototype SN 2002ic, we interpret as the explosion of a ...

Large samples of high-redshift supernovae (SNe) are potentially powerful probes of cosmic star formation, metal enrichment and SN physics. We present initial results from a new deep SN survey, based on re-imaging in the R,i', z' bands, of the 0.25deg2 Subaru Deep Field (SDF), with the 8.2-m Subaru telescope and Suprime-Cam. In a single ...

Type Ia supernovae (SNe Ia) have been very successful tools for studying the history of cosmic expansion and led to the discovery of the accelerating universe and dark energy. However, the explosion mechanism and progenitors for SNe Ia are still not fundamentally well understood. We present results from late time ...

We combine the CfA3 supernovae Type Ia (SN Ia) sample with samples from the literature to calculate improved constraints on the dark energy equation of state parameter, w. The CfA3 sample is added to the Union set of Kowalski et al. to form the Constitution set and, combined with a BAO prior, produces 1 + w = ...

Recovery of the supernova (SN) delay-time distribution (DTD) - the SN rate versus time that would follow a hypothetical brief burst of star formation - can shed light on SN progenitors and physics, as well as on the time-scales of chemical enrichment. Previous attempts to reconstruct the DTD have been based either ...

We analyze the mean rest-frame ultraviolet (UV) spectrum ofType Ia Supernovae(SNe) and its dispersion using high signal-to-noiseKeck-I/LRIS-B spectroscopyfor a sample of 36 events at intermediateredshift (z=0.5) discoveredby the Canada-France-Hawaii TelescopeSupernova Legacy Survey (SNLS). Weintroduce a new method for removinghost ...

The distance and redshift of a type Ia supernova can bedetermined simultaneously through its multi-band light curves. This factmay beused for imaging surveys that discover and obtain photometry forlarge numbers of supernovae; so many that it would be difficult to obtaina spectroscopic redshift for each. Using available ...

We compare the B-band light curves for 11 normal and 7 peculiar 91T/99aa-like Type Ia supernovae, all found from low-redshift searches. Each was chosen based on two criteria: 1) the SN was spectroscopically identified as either ``normal'' (i.e., resembling SNe 1990N, 1992A, 1992al) or ``peculiar'' (i.e., resembling ...

Prior to the explosive burning of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star "simmers" for ~103 yr in a convecting, carbon-burning region. I estimate the excitation of g-modes by convection during this phase and explore their possible effect on the WD. As these modes propagate from the core ...

Prior to the incineration of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star ``simmers'' for ~1000 yr in a convecting, carbon-burning region. We have found that weak interactions during this time increase the neutron excess by an amount that depends on the total quantity of carbon burned prior ...

Prior to the explosive burning of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star "simmers" for ~10^3 yrs in a convecting, carbon burning region. I estimate the excitation of g-modes by convection during this phase and explore their possible affect on the WD. As these modes propagate from the ...

We present photometric and spectroscopic observations of the Type Ia supernova SN 2009nr in UGC 8255 (z = 0.0122). Following the discovery announcement at what turned out to be 10 days after peak, we detected it at V sime15.7 mag in data collected by the All-Sky Automated Survey (ASAS) North telescope 2 weeks prior to the peak, and ...

It is still not clear what the progenitors of Type Ia Supernovae (SN Ia) are. There are currently two major competing (or compatible) formation channels under consideration: the single-degenerate scenario and the double-degenerate scenario (DDS). A DDS SN Ia is the result ...

Supernovae of type Ia (SNe Ia) are very important for cosmography. To exclude systematic effects in linking the observed light of distant SNe Ia to the parameters of cosmological models, one has to understand the nature of supernova outbursts and to build accurate algorithms for predicting ...

We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN Ia rate is determined from 9 SN events in a set of 71 C4 clusters at z {le} 0.17 ...

We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN Ia rate is determined from 9 SN events in a set of 71 C4 clusters at z <= 0.17 ...

We present measurements of the Type Ia supernova (SN) rate in galaxy clusters based on data from the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. The cluster SN Ia rate is determined from 9 SN events in a set of 71 C4 clusters at z ...

Observational data are presented in support of the hypothesis that background galaxy contamination is present in the photometric data of Ia supernovae and that this effect can account for the observed dispersion in the light curve speeds of most of Ia supernovae. The implication is that the observed dispersion in ...

Presenting early results from the joint CANDELS+CLASH Supernova survey, we describe the discovery and spectroscopic classification of a Type Ia Supernova (SNIa) at z=1.55, matching the highest redshift for a confirmed SNIa on record. This HST Treasury survey has the potential to detect and characterize SNIa out to redshift 2 and ...

We have used the Two Micron All Sky Survey near-infrared galaxy magnitudes to compute the supernova (SN) rates normalized to the stellar mass of the parent galaxies. The rates of all SN types show a sharp dependence on both the morphology and the B--K color of the galaxy. In particular,the Type Ia ...

We examine the dynamics and X-ray spectrum of the young Type Ia supernova remnant 0509-67.5 in the context of the recent results obtained from the optical spectroscopy of its light echo. Our goal is to estimate the kinetic energy of the supernova explosion using Chandra and XMM-Newton observations of the supernova ...

In the favored progenitor scenario, Type Ia supernovae (SNe Ia) arise from a white dwarf accreting material from a non-degenerate companion star. Soon after the white dwarf explodes, the ejected supernova material engulfs the companion star; two-dimensional hydrodynamical simulations by Marietta et al. (2001) show ...

Type Ia supernovae and their remnants play a major role in several areas of astrophysics, including chemical evolution of galaxies and cosmology. Recent results suggest that at least some SNe Ia may result from more massive progenitor systems than normally assumed. Historical SN Ia in our ...

Large planned photometric surveys will discover hundreds of thousands of supernovae (SNe), outstripping the resources available for spectroscopic follow-up and necessitating the development of purely photometric methods to exploit these events for cosmological study. We present a light curve fitting technique for type Ia supernova ...

We have constructed a comprehensive statistical model for Type Ia supernova (SN Ia) light curves spanning optical through near-infrared (NIR) data. A hierarchical framework coherently models multiple random and uncertain effects, including intrinsic supernova (SN) light ...