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

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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.

Item Type:	Journal Article
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society : Letters
Publisher:	Wiley
ISSN:	1745-3925
Official Date:	9 February 2010
Dates:	Date Event 9 February 2010 Published
Volume:	Volume 404
Number:	Number 1
Page Range:	L114-L118
DOI:	10.1111/j.1745-3933.2010.00847.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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