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WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE

Cameron, A. Collier ; Bouchy, F. ; Hébrard, G. ; Maxted, P. ; Pollacco, D. ; Pont, F. ; Skillen, I. ; Smalley, B. ; Street, R. A. ; West, R. G. ; Wilson, D. M. ; Aigrain, S. ; Christian, D. J. ; Clarkson, W. I. ; Enoch, B. ; Evans, A. ; Fitzsimmons, A. ; Fleenor, M. ; Gillon, M. ; Haswell, C. A. ; Hebb, L. ; Hellier, C. ; Hodgkin, S. T. ; Horne, K. ; Irwin, J. ; Kane, S. R. ; Keenan, F. P. ; Loeillet, B. ; Lister, T. A. ; Mayor, M. ; Moutou, C. ; Norton, A. J. ; Osborne, J. ; Parley, N. ; Queloz, D. ; Ryans, R. ; Triaud, A. H. M. J. ; Udry, S. ; Wheatley, P. J.

In: Monthly Notices of the Royal Astronomical Society, 2007, vol. 375, no. 3, p. 951-957

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    Title
    • WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE
    Author
    • 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
    • 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
    • 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, M.. Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, 4000 Liège, Belgium
    • 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
    • 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
    Document Type
    • Postprint
    OAI-PMH Identifier
    • oai:doc.rero.ch:301430
    Summary
    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 RJup, whereas WASP-2b has a radius in the range 0.65-1.26 RJup