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We present the first ground-based detection of thermal emission from anexoplanet in the H-band. Using HAWK-I on the VLT, we observed an occultation ofWASP-19b by its G8V-type host star. WASP-19b is a Jupiter-mass planet with anorbital period of only 19 h, and thus, being highly irradiated, is expected tobe 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 energyfrom day-side to night-side, under predicts the planet/star flux density ratioby a factor of two. As the stellar parameters, and thus the level of planetaryirradiation, are well-constrained by measurement, it is likely that our modelof the planet's atmosphere is too simple.

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