Spectroscopic Signatures of the Accretion of Earth-like Exoplanets

Details Spectroscopic Signatures of the Accretion of Earth-like Exoplanets Spectroscopic Signatures of the Accretion of Earth-like Exoplanets

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.3103f&link_type=abstract

American Astronomical Society, DPS meeting #37, #31.03; Bulletin of the American Astronomical Society, Vol. 37, p.683

Biology

3

Scientific paper

We used thermochemical equilibrium calculations to model the chemistry of silicate vapor and steam-rich atmospheres formed during accretion of Earth-like exoplanets. Accretion models that show temperatures of several thousand degrees during accretion of the Earth motivated this work. These models also predict the formation of a steam-rich atmosphere during the later stages of Earth's accretion. Our results show that silicon monoxide (SiO) gas is the major species in silicate vapor atmospheres for T > 3080 K, and monatomic Na gas is the major species for T < 3080 K (see figure). During later, cooler stages of accretion (1500 K), the major gases (abundances >1%) in a steam-rich atmosphere are H2O, H2, CO2, CO, H2S, and N2. CO converts to CH4 as the steam atmosphere cools. The dependence of gas chemistry on T and P over wide ranges was computed. The NASA Astrobiology Institute and Origins Program supported this work.
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