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WASP-3b : a strongly irradiated transiting gas-giant planet

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Pollacco, Don, Skillen, I., Collier Cameron, A., Loeillet, B., Stempels, H. C., Bouchy, F., Gibson, N. P., Hebb, L., Hébrard, G., Joshi, Y. C. et al.
(2008) WASP-3b : a strongly irradiated transiting gas-giant planet. Monthly Notices of the Royal Astronomical Society, Vol.385 (No.3). pp. 1576-1584. ISSN 0035-8711

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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 1.846 834 +/- 0.000 002 d. 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 and find it to have T-eff = 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(-0.14)(+0.08) M-J and radius 1.31(-0.14)(+0.07) 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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets, Astronomical photometry
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: 11 April 2008
Volume: Vol.385
Number: No.3
Number of Pages: 9
Page Range: pp. 1576-1584
Identification Number: 10.1111/j.1365-2966.2008.12939.x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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URI: http://wrap.warwick.ac.uk/id/eprint/30292

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