Abbreviated Journal Title
Mon. Not. Roy. Astron. Soc.
methods: data analysis; techniques: photometric; occultations; planets; and satellites: atmospheres; planets and satellites: individual:; WASP-19b; stars: individual: WASP-19; COLLISION-INDUCED ABSORPTION; SPITZER-SPACE-TELESCOPE; EXOPLANET HD; 189733B; GIANT PLANETS; EXTRASOLAR PLANET; TRANSITING EXOPLANET; SECONDARY ECLIPSE; STELLAR ACTIVITY; ATMOSPHERES; INVERSIONS; Astronomy & Astrophysics
We report detection of thermal emission from the exoplanet WASP-19b at 3.6, 4.5, 5.8 and 8.0 mu 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 mu 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 +/- 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.
Monthly Notices of the Royal Astronomical Society
Anderson, D. R.; Smith, A. M. S.; Madhusudhan, N.; Wheatley, P. J.; Cameron, A. Collier; Hellier, C.; Campo, C.; Gillon, M.; Harrington, Joseph; Maxted, P. F. L.; Pollacco, d.; Queloz, D.; Smalley, B.; Triaud, A. H. M. J.; and West, R. G., "Thermal emission at 3.6-8 mu m from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star" (2013). Faculty Bibliography 2010s. 3616.