Thermochemical and Photochemical Kinetics on the hot Jupiter HD 189733b

Details Thermochemical and Photochemical Kinetics on the hot Jupiter HD 189733b Thermochemical and Photochemical Kinetics on the hot Jupiter HD 189733b

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5604m&link_type=abstract

American Astronomical Society, DPS meeting #42, #56.04; Bulletin of the American Astronomical Society, Vol. 42, p.1078

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Observations of extrasolar planet transits and secondary eclipses -- mutual eclipse events where the planet passes in front of and behind its parent star as seen from Earth -- can reveal key physical and chemical properties of the exoplanet, including information about atmospheric composition. Theoretical models are needed to interpret these observations. We have developed a one-dimensional thermochemical and photochemical kinetics and transport model of the close-in transiting planet HD 189733b. The model transitions seamlessly from the thermochemical equilibrium regime in the deep troposphere to the "quenched equilibrium" and photochemical regimes in the upper troposphere and stratosphere. We investigate the coupled photochemistry of neutral carbon, hydrogen, oxygen, and nitrogen species on HD 189733b and explore how parameters like planetary metallicity, elemental ratios, eddy diffusion coefficients, and location (longitude/latitude/local time on this presumed tidally locked planet) affect the model results. We compare the model with existing transit and secondary eclipse observations to help explain observations of H2O, CO, CO2, and CH4 and to make predictions regarding other potentially important observable atmospheric constituents (e.g., NH3, HCN, C2H2). We find that both photochemistry and quenching significantly affect the abundance and distribution of atmospheric constituents. In particular, HCN and C2H2 are significant photochemical products in the sunlit hemisphere, whereas NH3 and CH4 are lost from the uppermost portions of the atmosphere, and many species -- methane most obviously -- are affected by transport-induced quenching.

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