Ground-based detection of thermal emission from the exoplanet WASP-19b

N.~P. Gibson, S. Aigrain, D.~L. Pollacco, S.~C.~C. Barros, L. Hebb, M. Hrudková, E.~K. Simpson, I. Skillen, R. West

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Abstract

We present an occultation of the newly discovered hot Jupiter system WASP-19, observed with the High Acuity Wide-field K-band Imager instrument on the VLT, in order to measure thermal emission from the planet's dayside at ~2µm. The light curve was analysed using a Markov Chain Monte Carlo method to find the eclipse depth and the central transit time. The transit depth was found to be 0.366 +/- 0.072 per cent, corresponding to a brightness temperature of 2540 +/- 180 K. This is significantly higher than the calculated (zero-albedo) equilibrium temperature and indicates that the planet shows poor redistribution of heat to the night side, consistent with models of highly irradiated planets. Further observations are needed to confirm the existence of a temperature inversion and possibly molecular emission lines. The central eclipse time was found to be consistent with a circular orbit.
Original languageEnglish
Pages (from-to)L114-L118
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume404
Issue number1
DOIs
Publication statusPublished - 01 May 2010

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Gibson, N. P., Aigrain, S., Pollacco, D. L., Barros, S. C. C., Hebb, L., Hrudková, M., Simpson, E. K., Skillen, I., & West, R. (2010). Ground-based detection of thermal emission from the exoplanet WASP-19b. Monthly Notices of the Royal Astronomical Society, 404(1), L114-L118. https://doi.org/10.1111/j.1745-3933.2010.00847.x