An Exoplanet Transmission Spectrum

Details An Exoplanet Transmission Spectrum An Exoplanet Transmission Spectrum

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..523s&link_type=abstract

Spitzer Proposal ID #523

Computer Science

Scientific paper

We propose to determine the abundance of CO2 and HCN in the terminator region of the atmosphere of the hot-Jupiter exoplanet HD 189733b. This will be done by obtaining IRS spectroscopy measurements between 7.5 and 15 microns of primary eclipse event. Recent IRS secondary eclipse measurements (which probe the dayside region of the exoplanet atmosphere) have detected CO2 and HCN with abundances that cannot be due to equilibrium chemistry. This strongly implies that photochemistry is modifying the dayside atmospheric composition. By measuring the abundances of CO2 and HCN in the terminator region, we will determine if equilibrium chemistry dominates the atmospheric composition once the radiation forcing is removed. Additionally, our proposed measurements, when combined with existing near-IR and mid-IR spectroscopy data, will provide decisive constraints on the conditions, composition, and chemistry of an exoplanet atmosphere.

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