Constraints on the Atmospheric Composition of GJ 436b Using Secondary Eclipse Photometry

Details Constraints on the Atmospheric Composition of GJ 436b Using Secondary Eclipse Photometry Constraints on the Atmospheric Composition of GJ 436b Using Secondary Eclipse Photometry

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4203s&link_type=abstract

American Astronomical Society, DPS meeting #41, #42.03

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Of the over 50 known transiting exoplanets, GJ 436b is Earth's nearest neighbor and the only transiting companion to an M dwarf. It is classified as a hot Neptune because of its close proximity to its parent star, GJ 436, and its small size relative to other known exoplanets. The Spitzer Exoplanet Target of Opportunity program observes secondary eclipses, where the planet passes behind the star, to provide direct measurements of emitted planetary flux, thus constraining atmospheric models. The observations, which took place in three groups between June of 2007 and June of 2008, include five lightcurves at 8.0 microns and one lightcurve each at 3.6, 4.5, 5.8, 16, and 24 microns. We will present estimates of infrared brightness temperatures and the atmospheric composition using a new temperature and abundance retrieval modeling method. A companion talk by Hardy et al. will provide constraints on the eccentricity and argument of periapsis due to the precise phase of secondary eclipse. Spitzer is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA, which provided support for this work.

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