H-band thermal emission from the 19-hour period planet WASP-19b

Abstract

We present the first ground-based detection of thermal emission from an exoplanet in the H-band. Using HAWK-I on the VLT, we observed an occultation of WASP-19b by its G8V-type host star. WASP-19b is a Jupiter-mass planet with an orbital period of only 19 h, and thus, being highly irradiated, is expected to be hot. We measure an H-band occultation depth of (0.259 +0.046 -0.044) %, which corresponds to an H-band brightness temperature of T_H = 2580 +/- 125 K. A cloud-free model of the planet's atmosphere, with no redistribution of energy from day-side to night-side, under predicts the planet/star flux density ratio by a factor of two. As the stellar parameters, and thus the level of planetary irradiation, are well-constrained by measurement, it is likely that our model of the planet's atmosphere is too simple.

5 pages, 4 figures, 1 table, as accepted for publication in A&A

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• The Optical and Near-Infrared Transmission Spectrum of the Super-Earth GJ1214b: Further Evidence for a Metal-Rich Atmosphere
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• Ground-Based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-Infrared
• A simple model of the reflection effect for the interacting binaries and extrasolar planets
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• The GROUSE project III: Ks-band observations of the thermal emission from WASP-33b
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• Characterization of Exoplanets: Secondary Eclipses
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