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25 April 2024

» arxiv » 1112.5145

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Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star
D. R. Anderson ; A. M. S. Smith ; N. Madhusudhan ; P. J. Wheatley ; A. Collier Cameron ; C. Hellier ; C. Campo ; M. Gillon ; J. Harrington ; P. F. L. Maxted ; D. Pollacco ; D. Queloz ; B. Smalley ; A. H. M. J. Triaud ; R. G. West ;
Date:	21 Dec 2011
Abstract:	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.
Source:	arXiv, 1112.5145
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