Equilibrium Chemistry of the Atmospheres of Hot Earth-like Exoplanets

Details Equilibrium Chemistry of the Atmospheres of Hot Earth-like Exoplanets Equilibrium Chemistry of the Atmospheres of Hot Earth-like Exoplanets

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5602s&link_type=abstract

American Astronomical Society, DPS meeting #42, #56.02; Bulletin of the American Astronomical Society, Vol. 42, p.1078

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The Kepler and COROT missions and Earth-based observations have discovered putative rocky exoplanets and at least some of these are very hot because they orbit their stars at close distance, e.g., CoRot-7b. Here we discuss atmospheric chemistry for an Earth-like planet hot enough to vaporize its crust. We computed the chemical equilibrium composition of a system with elemental abundances of the terrestrial continental crust from 500 - 4000 K as a function of pressure from 10-6 to 10+2.5 bars. Calculations were done with a Gibbs energy minimization code. We will present results for the major volatile elements H, C, N, O, and S, and the lithophile elements Na, K, Fe, Si, Mg, Al, Ca, and Ti at a nominal pressure of 100 bars as a function of temperature. The major gases are H2O and CO2 at low temperatures, and SiO, O, H, and O2 at high temperatures. We also present condensation temperatures for major compounds as a function of pressure, which will be useful in determining cloud composition. These results should be useful in planning spectroscopic studies of the atmospheres of hot Earth-like exoplanets. This work was supported by the NSF Astronomy Program and the NASA Astrobiology Program.

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