Thermal emission at 3.6-8 μm from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star
Abstract
We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 μm. 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 μm 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 ± 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 2013
- DOI:
- 10.1093/mnras/stt140
- arXiv:
- arXiv:1112.5145
- Bibcode:
- 2013MNRAS.430.3422A
- Keywords:
-
- methods: data analysis;
- techniques: photometric;
- occultations;
- planets and satellites: atmospheres;
- planets and satellites: individual: WASP-19b;
- stars: individual: WASP-19;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- As accepted for publication in MNRAS. 12 pages, 5 figures, 3 tables