Title

Thermal emission at 3.6-8 mu m from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star

Authors

Authors

D. R. Anderson; A. M. S. Smith; N. Madhusudhan; P. J. Wheatley; A. C. Cameron; C. Hellier; C. Campo; M. Gillon; J. Harrington; P. F. L. Maxted; D. Pollacco; D. Queloz; B. Smalley; Ahmj Triaud;R. G. West

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Mon. Not. Roy. Astron. Soc.

Keywords

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

Abstract

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.

Journal Title

Monthly Notices of the Royal Astronomical Society

Volume

430

Issue/Number

4

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

3422

Last Page

3431

WOS Identifier

WOS:000318339700076

ISSN

0035-8711

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