[en] We report the discovery by the CoRoT space mission of a transiting brown dwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has a radius of 1.12[SUP]+0.30[/SUP][SUB]-0.15[/SUB] {R}_Jup and a mass of 63.3 ± 4.1 {M}_Jup, and is thus the second transiting companion lying in the theoretical mass domain of brown dwarfs. CoRoT-15b is either very young or inflated compared to standard evolution models, a situation similar to that of M-dwarf stars orbiting close to solar-type stars. Spectroscopic constraints and an analysis of the lightcurve imply a spin period in the range 2.9-3.1 days for the central star, which is compatible with a double-synchronisation of the system. The CoRoT space mission, launched on December 27th 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD and Science Programme), Germany, and Spain. Observations made with HARPS spectrograph at ESO La Silla Observatory (184.C-0639).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bouchy, F.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France ; Observatoire de Haute Provence, CNRS/OAMP, 04870 St Michel l'Observatoire, France
Deleuil, M.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Guillot, T.; Université de Nice-Sophia Antipolis, CNRS UMR 6202, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
Aigrain, S.; Department of Physics, Denys Wilkinson Building Keble Road, Oxford, OX1 3RH, UK
Carone, L.; Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, Köln 50931, Germany
Cochran, W. D.; McDonald Observatory, The University of Texas, Austin, TX 78712, USA
Almenara, J. M.; Instituto de Astrofosica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Alonso, R.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Auvergne, M.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Baglin, A.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Barge, P.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Bonomo, A. S.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Bordé, P.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405 Orsay, France
Csizmadia, Szilard; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany
de Bondt, K.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Deeg, H. J.; Instituto de Astrofosica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Díaz, R. F.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Dvorak, R.; University of Vienna, Institute of Astronomy, Türkenschanzstr. 17, 1180 Vienna, Austria
Endl, M.; McDonald Observatory, The University of Texas, Austin, TX 78712, USA
Erikson, A.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany
Ferraz-Mello, S.; IAG, University of Sao Paulo, Brazil
Fridlund, M.; Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG Noordwijk, The Netherlands
Gandolfi, D.; Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG Noordwijk, The Netherlands ; Thüringer Landessternwarte, Sternwarte 5, Tautenburg 5, 07778 Tautenburg, Germany
Gazzano, J. C.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Gibson, N.; Department of Physics, Denys Wilkinson Building Keble Road, Oxford, OX1 3RH, UK
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Havel, M.; Université de Nice-Sophia Antipolis, CNRS UMR 6202, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
Hébrard, G.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Jorda, L.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Léger, A.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405 Orsay, France
Lovis, C.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
Llebaria, A.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Lammer, H.; Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042 Graz, Austria
MacQueen, P. J.; McDonald Observatory, The University of Texas, Austin, TX 78712, USA
Mazeh, T.; School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
Moutou, C.; Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388 Marseille Cedex 13, France
Ofir, A.; School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
Ollivier, M.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405 Orsay, France
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Pätzold, M.; Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Strasse 209, Köln 50931, Germany
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