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Thermal emission at 3.6-8 m from WASP-19b : a hot Jupiter without a stratosphere orbiting an active star
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Anderson, D. R., Smith, A. M. S., Madhusudhan, N., Wheatley, P. J., Collier Cameron, A., Hellier, C., Campo, C., Gillon, M., Harrington, J., Maxted, P. F. L., Pollacco, Don, Queloz, D., Smalley, B., Triaud, A. H. M. J. and West, Richard G. (2013) Thermal emission at 3.6-8 m from WASP-19b : a hot Jupiter without a stratosphere orbiting an active star. Monthly Notices of the Royal Astronomical Society, Volume 430 (Number 4). pp. 3422-3431. doi:10.1093/mnras/stt140 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt140
Abstract
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 2.09m 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 (logR HK4.50 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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
Publisher: | Oxford University Press | ||||
ISSN: | 0035-8711 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 430 | ||||
Number: | Number 4 | ||||
Page Range: | pp. 3422-3431 | ||||
DOI: | 10.1093/mnras/stt140 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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