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Title:
WASP-3b: a strongly irradiated transiting gas-giant planet
Authors:
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.
Affiliation:
AA(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AB(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain), AC(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AD(Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France), AE(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AF(Institut d'Astrophysique de Paris, CNRS (UMR 7095) - Université Pierre & Marie Curie, 98bis bvd. Arago, 75014 Paris, France; Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France), AG(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AH(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AI(Institut d'Astrophysique de Paris, CNRS (UMR 7095) - Université Pierre & Marie Curie, 98bis bvd. Arago, 75014 Paris, France), AJ(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AK(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AL(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AM(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AN(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN; Las Cumbres Observatory, 6740 Cortona Dr Suite 102, Santa Barbara, CA 93117, USA), AO(Observatoire de Genéve, Université de Genéve, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland), AP(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), AQ(Astrophysics Group, Keele University, Staffordshire ST5 5BG), AR(Department of Physics, University of Warwick, Coventry CV4 7AL), AS(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), AT(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AU(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain), AV(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), AW(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), AX(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA; STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA), AY(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), AZ(Astrophysics Group, Keele University, Staffordshire ST5 5BG), BA(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), BB(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), BC(Astrophysics Group, Keele University, Staffordshire ST5 5BG), BD(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain; Centre for Astrophysics, Science & Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), BE(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), BF(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS), BG(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain; Astronomical Institute, Charles University Prague, V Holesovickach 2, CZ-180 00 Praha, Czech Republic), BH(Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), BI(Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain; Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA), BJ(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), BK(School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS; Astrophysics Group, Keele University, Staffordshire ST5 5BG; Las Cumbres Observatory, 6740 Cortona Dr Suite 102, Santa Barbara, CA 93117, USA), BL(Astrophysics Group, Keele University, Staffordshire ST5 5BG), BM(Observatoire de Genéve, Université de Genéve, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland), BN(Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France), BO(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), BP(Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH), BQ(Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA), BR(Observatoire de Genéve, Université de Genéve, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland), BS(Observatoire de Genéve, Université de Genéve, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland), BT(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN), BU(Astrophysics Research Centre, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 3, pp. 1576-1584. (MNRAS Homepage)
Publication Date:
04/2008
Origin:
MNRAS
Astronomy Keywords:
methods: data analysis , techniques: photometric , techniques: radial velocities , planetary systems
DOI:
10.1111/j.1365-2966.2008.12939.x
Bibliographic Code:
2008MNRAS.385.1576P

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-B1.01256-0285133 every 1.846834 +/- 0.000002 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 +/- 100K 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 MJ and radius 1.31+0.07-0.14 RJ 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.

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