Thermal emission at 3.6-8 μm from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star
- Anderson, D. R.
- Smith, Alexis Michael Sheridan
- Madhusudhan, N.
- Wheatley, P. J.
- Cameron, Andrew Collier
- Hellier, C.
- Campo, C.
- Gillon, M.
- Harrington, J.
- Maxted, P. F. L.
- Pollacco, D.
- Queloz, D.
- Smalley, B.
- Triaud, A. H. M. J.
- West, R. G.
DOIAbstract
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 ar...
Add to ORKG