We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 $m. 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 $m to construct a spectral energy distribution of the planet's dayside atmosphere. By comparing this with model-atmosphere spectra, we find that the dayside atmosphere of WASP-19b lacks a strong temperature inversion. As WASP-19 is an active star (log R'$_HK$ = -4.50 plusmn 0.03), this finding supports the hypothesis of Knutson, Howard and Isaacson 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.
|Number of pages||10|
|Journal||Royal Astronomical Society. Monthly Notices|
|Publication status||Published - 1 Apr 2013|
- methods: data analysis, techniques: photometric, occultations, planets and satellites: atmospheres, planets and satellites: individual: WASP-19b, stars: individual: WASP-19