The transmission spectrum of Earth-size transiting planets

Details The transmission spectrum of Earth-size transiting planets The transmission spectrum of Earth-size transiting planets

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.3114e&link_type=abstract

American Astronomical Society, DPS meeting #37, #31.14; Bulletin of the American Astronomical Society, Vol. 37, p.1565

Computer Science

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Scientific paper

We present work regarding atmospheric signatures of transiting Earth-size exoplanets. Differing planets have different atmospheres, and depending on abundances and various physical parameters, we evaluate the possibility to detect by absorption spectroscopy molecules such as water (H2O), carbon dioxide (CO2), ozone (O3) or molecular oxygen (O2), from ultraviolet (UV) to near infrared (NIR). We find that the thick atmospheres of planets such as small volatile-rich satellites of giant exoplanets or that of `ocean-planets' are the easiest to detect by such technique. On the contrary, we find that `Venus-like' planets have atmospheres which are the most challenging to probe. We discuss quantitatively the instrument performance needed to achieve the detection of these cases. We also evaluate the impact of the stellar type and found that planets around K stars are favoured mainly because the star is small. Moreover they provide a large fraction of potential targets. The atmospheres of a few dozen Earth-like or small Earth-like planets could be observed with a 10-meter or larger sized telescope provided that these planets are frequent and that the surveys will have good efficiency to detect them.

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