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Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star

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arxiv 1112.5145 v2 pith:LJSQI2TX submitted 2011-12-21 astro-ph.EP

D. R. Anderson , A. M. S. Smith , N. Madhusudhan , P. J. Wheatley , A. Collier Cameron , C. Hellier , C. Campo , M. Gillon
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J. Harrington P. F. L. Maxted D. Pollacco D. Queloz B. Smalley A. H. M. J. Triaud R. G. West
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keywords wasp-19bactiveatmosphereemissionmicronstardaysideorbiting
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We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 micron. We used the InfraRed Array Camera on the Spitzer Space Telescope to observe two occultations of WASP-19b by its host star. We combine our new detections with previous measurements of WASP-19b's emission at 1.6 and 2.09 micron to construct a spectral energy distribution of the planet's dayside atmosphere. By comparing this with model-atmosphere spectra, we find that the dayside atmosphere of WASP-19b lacks a strong temperature inversion. As WASP-19 is an active star (log RHK = -4.50 +/- 0.03), this finding supports the hypothesis of Knutson, Howard & Isaacson (2010) that inversions are suppressed in hot Jupiters orbiting active stars. The available data are unable to differentiate between a carbon-rich and an oxygen-rich atmosphere.

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