WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE
English
Cameron, A Collier[School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS]
Bouchy, F.[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]
Hébrard, G.[Institut d'Astrophysique de Paris, CNRS (UMR 7095) - Université Pierre & Marie Curie, 98bis bvd. Arago, 75014 Paris, France]
Maxted, P.[Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Pollacco, D.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
Pont, F.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Skillen, I.[Isaac Newton Group of Telescopes, Apartado de Correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain]
Smalley, B.[Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Street, R. A.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
West, R. G.[Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH]
Wilson, D. M.[Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Aigrain, S.[Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA]
Christian, D. J.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
Clarkson, W. I.[Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA; STScI, 3700 San Martin Drive, Baltimore, MD 21218, USA]
Enoch, B.[Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA]
Evans, A.[Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Fitzsimmons, A.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
Fleenor, M.[Volunteer Observatory, 10305 Mantooth Lane Knoxville, TN 37932, USA]
Gillon, Michaël[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Haswell, C. A.[Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA]
Hebb, L.[School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS]
Hellier, C.[Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Hodgkin, S. T.[Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA]
Horne, K.[School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS]
Irwin, J.[Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA]
Kane, S. R.[Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA]
Keenan, F. P.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
Loeillet, B.[Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France]
Lister, T. A.[School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS; Astrophysics Group, Keele University, Staffordshire ST5 5BG]
Mayor, M.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Moutou, C.[Laboratoire d'Astrophysique de Marseille, BP 8, 13376 Marseille Cedex 12, France]
Norton, A. J.[Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA]
Osborne, J.[Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH]
Parley, N.[Department of Physics and Astronomy, The Open University, Milton Keynes MK7 6AA]
Queloz, D.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Ryans, R.[ARC, Main Physics Building, School of Mathematics & Physics, Queen's University, University Road, Belfast BT7 1NN]
Triaud, A H M J[School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS]
Udry, S.[Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland]
Wheatley, P. J.[Department of Physics, University of Warwick, Coventry CV4 7AL]
[en] methods: data analysis ; techniques: photometric ; techniques: radial velocities ; planetary systems
[en] We have detected low-amplitude radial-velocity variations in two stars, USNO-B1.0 1219-0005465 (GSC 02265-00107 = WASP-1) and USNO-B1.0 0964-0543604 (GSC 00522-01199 = WASP-2). Both stars were identified as being likely host stars of transiting exoplanets in the 2004 SuperWASP wide-field transit survey. Using the newly commissioned radial-velocity spectrograph SOPHIE at the Observatoire de Haute-Provence, we found that both objects exhibit reflex orbital radial-velocity variations with amplitudes characteristic of planetary-mass companions and in-phase with the photometric orbits. Line-bisector studies rule out faint blended binaries as the cause of either the radial-velocity variations or the transits. We perform preliminary spectral analyses of the host stars, which together with their radial-velocity variations and fits to the transit light curves yield estimates of the planetary masses and radii. WASP-1b and WASP-2b have orbital periods of 2.52 and 2.15 d, respectively. Given mass estimates for their F7V and K1V primaries, we derive planet masses 0.80-0.98 and 0.81-0.95 times that of Jupiter, respectively. WASP-1b appears to have an inflated radius of at least 1.33 R[SUB]Jup[/SUB], whereas WASP-2b has a radius in the range 0.65-1.26 R[SUB]Jup[/SUB].
[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
