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25 April 2024

» arxiv » 0711.0126

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WASP-3b: a strongly-irradiated transiting gas-giant planet
D. Pollacco ; I. Skillen ; A. Collier Cameron ; B. Loeillet ; H.C. Stempels ; F. Bouchy ; N.P. Gibson ; L. Hebb ; G. Hebrard ; Y.C. Joshi ; I. McDonald ; B. Smalley ; A.M.S. Smith ; R.A. Street ; S. Udry ; R.G. West ; D.M. Wilson ; P.J. Wheatley ; S. Aigrain ; C.R. Benn ; V.A. Bruce ; D.J. Christian ; W.I. Clarkson ; B. Enoch ; A. Evans ; A.Fitzsimmons ; C.A. Haswell ; C. Hellier ; S. Hickey ; S.T. Hodgkin ; K. Horne ; M. Hrudkova ; J. Irwin ; S.R. Kane ; F.P. Keenan ; T.A. Lister ; P. Maxted ; M. Mayor ; C. Moutou ; A.J. Norton ; J. P. Osborne ; N. Parley ; F. Pont ; D. Queloz ; R. Ryans ; E. Simpson ;
Date:	1 Nov 2007
Abstract:	We report the discovery of WASP-3b, the third transiting exoplanet to be discovered by the WASP and SOPHIE collaboration. WASP-3b transits its host star USNO-B1.0 1256-0285133 every 1.846834+-0.000002 days. Our high precision radial-velocity measurements present a variation with amplitude characteristic of a planetary-mass companion and in-phase with the light-curve. Adaptive optics imaging shows no evidence for nearby stellar companions, and line-bisector analysis excludes faint, unresolved binarity and stellar activity as the cause of the radial-velocity variations. We make a preliminary spectroscopic analysis of the host star finding it to have Teff = 6400+-100 K and log g = 4.25+-0.05 which suggests it is most likely an unevolved main sequence star of spectral type F7-8V. Our simultaneous modelling of the transit photometry and reflex motion of the host leads us to derive a mass of 1.76 +0.08 -0.14 M_J and radius 1.31 +0.07-0.14 R_J for WASP-3b. The proximity and relative temperature of the host star suggests that WASP-3b is one of the hottest exoplanets known, and thus has the potential to place stringent constraints on exoplanet atmospheric models.
Source:	arXiv, 0711.0126
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