The Orbit and Atmosphere of Exoplanet WASP-12b Revealed by Spitzer Secondary Eclipses

Details The Orbit and Atmosphere of Exoplanet WASP-12b Revealed by Spitzer Secondary Eclipses The Orbit and Atmosphere of Exoplanet WASP-12b Revealed by Spitzer Secondary Eclipses

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741802h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #418.02; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Exoplanet WASP-12b has a period of 1.09 days and is close enough to its G0 star that, if eccentric, its orbital precession period of a few decades could be measureable in just a few years with high-precsion secondary eclipse measurements. We observed four secondary eclipses of WASP-12b with the Spitzer Space Telescope separated by several years. Combined with ground-based transit and radial-velocity measurements, we find a small eccentricity but no measurable precession. However, the eclipse depths have S/N as high as 29, among the highest ever obtained. The brightness temperatures are 3000 K, allowing atmospheric characterization at a nearly unprecedented level, especially when combined with the ground-based, near-infrared eclipses of Croll et al. Our analysis used a Markov-Chain Monte Carlo method to explore the space of thermal profiles and molecular abundances of CO, CH4, H2O, CO2, and included also collision-induced absorption and TiO/VO. It calculated over 4 million spectra and integrated them over the seven secondary eclipse bandpasses to compare to the observations. We will present the results at the meeting.

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