CO2 Chemistry in the Atmosphere of HD189733b

Details CO2 Chemistry in the Atmosphere of HD189733b CO2 Chemistry in the Atmosphere of HD189733b

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4204l&link_type=abstract

American Astronomical Society, DPS meeting #41, #42.04

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Recent infrared spectroscopy of hot exoplanets has opened up the door to their atmospheric composition. Atmospheric composition is controlled by thermochemical equilibrium deep in the planetary atmosphere and photochemistry higher up in the atmosphere at levels above 2 bars. These two chemistries interact near 100 bars in Jupiter-like atmospheres. HD189733b provides an excellent laboratory to study the consequences of this hot atmospheric chemistry. The recent spectrum of HD189733b obtained by Swain et al., 2009 shows absorption features of CO2, CO and H2O. These observations suggest that the observable atmosphere of HD189733b is dominated primarily by CO2 chemistry. Here we explore thermochemical equilibrium chemistry using the NASA-Goddard Chemical Equilibrium with Applications (CEA) code and the CO2 photochemistry with JPL/Caltech KINETICS code and how these chemistries manifest themselves in the observed spectrum using a radiative transfer code. We will also explore techniques for retrieving temperatures and mixing ratios from observed spectra.

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