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Content with the tag: “m stars”
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Plants on Other Planets May Not be Green
Differently colored plants may live on extra-solar planets, according to two new papers in the current issue of Astrobiology authored by members of NAI’s Virtual Planetary Laboratory Alumni Team and their colleagues. They took previously simulated planetary atmospheric compositions for Earth-like planets orbiting various star types (including M stars), generated spectra, and found that photosynthetic pigments may peak in absorbance in the blue for some star types, and red-orange and near-infrared for others. Their results also suggest that, under...
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Habitability of Planets Around M Dwarf Stars
Multidisciplinary work from members of NAI’s SETI Institute Team and a host of collaborators across the NAI re-examines what is known at present about the potential for a terrestrial planet forming within, or migrating into, the classic liquid–surface–water habitable zone close to an M dwarf star. Their new paper, published in the current issue of Astrobiology, presents the summary conclusions of an interdisciplinary workshop sponsored by NAI and convened at the SETI Institute in 2005.
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Exovegetation!
NAI’s Virtual Planetary Laboratory Team have explored the possibility of detecting exovegetation on terrestrial planets orbiting M stars. They estimated the red-shift of this surface feature using leaf optical property spectra with a three photon photosynthetic scheme. The authors have produced a model wherein a pigment-derived surface signature such as exovegetation could be detected, but would be dependent upon the extent of the vegetation on the surface, cloud cover, and viewing angle. Their paper is in the current issue...
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Super-Earths Around M Dwarf Stars - Competing Theories
Alan Boss of NAI’s Carnegie Institution of Washington Team published in the current issue of the Astrophysical Journal a new look at the origin of super-Earths orbiting M dwarf stars. The core accretion mechanism of giant planet formation has been used to explain the presence of these planets. Boss’ new work shows they could also have been formed by the disk instability mechanism.
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