[en] We report the discovery of WASP-4b, a large transiting gas-giant planet with an orbital period of 1.34 days. This is the first planet to be discovered by the SuperWASP-South observatory and CORALIE collaboration and the first planet orbiting a star brighter than 16th magnitude to be discovered in the southern hemisphere. A simultaneous fit to high-quality light curves and precision radial velocity measurements leads to a planetary mass of 1.22[SUP]+0.09[/SUP][SUB]-0.08[/SUB] M[SUB]Jup[/SUB] and a planetary radius of 1.42[SUP]+0.07[/SUP][SUB]-0.04[/SUB] R[SUB]Jup[/SUB]. The host star is USNO-B1.0 0479-0948995, a G7 V star of visual magnitude 12.5. As a result of the short orbital period, the predicted surface temperature of the planet is 1761 K, making it an ideal candidate for detections of the secondary eclipse at infrared wavelengths.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Wilson, D. M.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Hellier, C.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Maxted, P. F. L.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Pepe, F.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Queloz, D.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Anderson, D. R.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Collier Cameron, A.; School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK.
Smalley, B.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Lister, T. A.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK. ; Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117.
Bentley, S. J.; Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK.
Blecha, A.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Christian, D. J.; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, UK.
Enoch, B.; Department of Physics and Astronomy, Open University, Milton Keynes MK7 6AA, UK.
Haswell, C. A.; Department of Physics and Astronomy, Open University, Milton Keynes MK7 6AA, UK.
Hebb, L.; School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK.
Horne, K.; School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK.
Irwin, J.; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK. ; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-16, Cambridge, MA 02138-1516.
Joshi, Y. C.; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, UK.
Kane, S. R.; Michelson Science Center, California Institute of Technology, MS 100-22, 770 South Wilson Avenue, Pasadena, CA 91125.
Marmier, M.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Mayor, M.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Parley, N.; Department of Physics and Astronomy, Open University, Milton Keynes MK7 6AA, UK.
Pollacco, D.; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, UK.
Pont, F.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
Ryans, R.; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, UK.
Segransan, D.; Observatoire 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.
Street, R. A.; Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117. ; Astrophysics Research Centre, School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, UK. ; Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93106-9530.
Udry, S.; Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland.
West, R. G.; Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK.
Wheatley, P. J.; Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
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