H-band thermal emission from the 19-h 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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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 plusmn 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. Based on data collected with the VLT/HAWKI instrument at ESO Paranal Observatory, Chile (programs 083.C-0377(A)).The photometric time-series used in this work are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/513/L3
Original languageEnglish
Pages (from-to)L3
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Apr 2010


  • planets and satellites: atmospheres, planetary systems, stars: individual: WASP-19b, techniques: photometric


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