WASP-3b: a strongly irradiated transiting gas-giant planet
Pollacco, D. ; Skillen, I. ; Collier Cameron, A. ; Loeillet, B. ; Stempels, H. C. ; Bouchy, F. ; Gibson, N. P. ; Hebb, L. ; Hébrard, G. ; Joshi, Y. C. ; McDonald, I. ; Smalley, B. ; Smith, A. M. S. ; Street, R. A. ; Udry, S. ; West, R. G. ; Wilson, D. M. ; Wheatley, P. J. ; Aigrain, S. ; Alsubai, K. ; Benn, C. R. ; Bruce, V. A. ; Christian, D. J. ; Clarkson, W. I. ; Enoch, B. ; Evans, A. ; Fitzsimmons, A. ; Haswell, C. A. ; Hellier, C. ; Hickey, S. ; Hodgkin, S. T. ; Horne, K. ; Hrudková, M. ; Irwin, J. ; Kane, S. R. ; Keenan, F. P. ; Lister, T. A. ; Maxted, P. ; Mayor, M. ; Moutou, C. ; Norton, A. J. ; Osborne, J. P. ; Parley, N. ; Pont, F. ; Queloz, D. ; Ryans, R. ; Simpson, E.
In: Monthly Notices of the Royal Astronomical Society, 2008, vol. 385, no. 3, p. 1576-1584
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- 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 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+0.08−0.14MJ and radius 1.31+0.07−0.14RJ 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