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arXiv · 1002.1947

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

D. R. Anderson·M. Gillon·P. F. L. Maxted·T. S. Barman·A. Collier Cameron·C. Hellier·D. Queloz·B. Smalley·A. H. M. J. Triaud
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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.

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D. R. Anderson, M. Gillon, P. F. L. Maxted, T. S. Barman, A. Collier Cameron, C. Hellier, D. Queloz, B. Smalley, A. H. M. J. Triaud. 2010-02-09. H-band thermal emission from the 19-hour period planet WASP-19b. https://doi.org/10.1051/0004-6361/201014226

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