Probing water vapor and CO in the atmosphere of HD 209458b

Details Probing water vapor and CO in the atmosphere of HD 209458b Probing water vapor and CO in the atmosphere of HD 209458b

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..461t&link_type=abstract

Spitzer Proposal ID #461

Computer Science

Scientific paper

The success obtained with the 3.6, 5.8 and 8 um IRAC observations of HD 189733 leading to the discovery of the signature of water vapor in the atmosphere of the hot Jupiter HD 189733b, has prompted us to submit this DDT proposal. 13.4 hours are required for similar observations with the transiting Hot Jupiter HD 209458b: in particular we propose here to observe all the four IRAC bands and to search for water vapor and CO in the atmosphere of HD 209458b. The signal will be weaker than the one on HD 189733b but, according to our calculations, it will be detectable at 3 sigma in each band. HD 209458b is the gas giant with the lowest density and, because of its orbital parameters and stellar companion, it is warmer than HD 189733b. These characteristics guarantee that its atmosphere is very extended, hence it is an ideal target to be observed in primary transit. Despite the plethora of Spitzer observations of exoplanets, the ability to coadd different epochs of IRAC data to improve signal-to-noise in spite of systematics has not been demonstrated. We ask for an additional 6.7 hours (for a total of 20.2) for a second epoch observation of the transit at 3.6 and 5.8 um to beat the noise further down and provide better constraints on the temperature profile and water abundance.

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