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

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

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 TH = 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.

Original languageEnglish (US)
Article numberL3
JournalAstronomy and astrophysics
Volume513
Issue number2
DOIs
StatePublished - Apr 14 2010

Keywords

  • Planetary systems
  • Planets and satellites: atmospheres
  • Stars: individual: WASP-19b
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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