Measuring the Infrared Spectrum of the Transiting Extrasolar Planet HD 209458b

Details Measuring the Infrared Spectrum of the Transiting Extrasolar Planet HD 209458b Measuring the Infrared Spectrum of the Transiting Extrasolar Planet HD 209458b

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20534r&link_type=abstract

Spitzer Proposal ID #20534

Physics

Scientific paper

Researchers from two independent groups recently detected the first infrared signal from an extrasolar planet. Deming et. al. (2005a) detected the 24-micron flux density of HD 209458b using MIPS at secondary eclipse, and Charbonneau et. al. (2005) detected the infrared signal of TrES-1 using IRAC at 4.5 and 8 microns. These results have dramatically demonstrated the ability of Spitzer to characterize extrasolar planets. We propose to build on these observations with IRS spectroscopy of HD 209458b from 7.4 to 14.5 microns. By observing the system both during and outside of secondary eclipse, we will derive the planetary spectrum from the change in the shape of the continuum spectrum in combined light. These observations will lead directly to a measurement of the temperature gradient in the planetary atmosphere and the column density of water above the clouds, and we will search for variability due to atmospheric dynamics.

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