[en] We present the discovery of a candidate multiply transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76 d are detected in the CoRoT light curve around a main sequence K1V star of r = 15.1. If the features are due to transiting planets around the same star, these would correspond to objects of 3.7 ± 0.4 and 5.0 ± 0.5 R[SUB]⊕[/SUB] , respectively. Several radial velocities serve to provide an upper limit of 5.7 M[SUB]⊕[/SUB] for the 5.11 d signal and to tentatively measure a mass of 28[SUP]+11[/SUP][SUB]-11[/SUB] M[SUB]⊕[/SUB] for the object transiting with a 11.76 d period. These measurements imply low density objects, with a significant gaseous envelope. The detailed analysis of the photometric and spectroscopic data serves to estimate the probability that the observations are caused by transiting Neptune-sized planets as much as over 26 times higher than a blend scenario involving only one transiting planet and as much as over 900 times higher than a scenario involving two blends and no planets. The radial velocities show a long-term modulation that might be attributed to a 1.5 M[SUB]Jup[/SUB] planet orbiting at 1.8 AU from the host, but more data are required to determine the precise orbital parameters of this companion. The CoRoT space mission, launched on 27 December 2006, has been developed and is operated by the CNES, with the contribution of Austria, Belgium, Brazil, ESA (RSSD and Science Program), Germany, and Spain. Some of the observations were made with the HARPS spectrograph at ESO La Silla Observatory (184.C-0639) and with the HIRES spectrograph at the Keck Telescope (N035Hr, N143Hr 260 and N095Hr). Partly based on observations obtained at ESO Paranal Observatory, Chile (086.C-0235(A) and B).Tables 2-4 and Fig. 12 are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201118662/olm">http://www.aanda.org</A>
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Alonso, R.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland ; Instituto de Astrofísica de Canarias, 38205, La Laguna, Tenerife, Spain ; Dpto. de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain
Moutou, C.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Endl, M.; McDonald Observatory, University of Texas at Austin, Austin, TX, 78712, USA
Almenara, J.-M.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Guenther, E. W.; Thüringer Landessternwarte, Sternwarte 5, , 07778, Tautenburg, Germany ; Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042, Graz, Austria
Deleuil, M.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Auvergne, M.; LESIA, Observatoire de Paris, place Jules Janssen, 92195, Meudon Cedex, France
Baglin, A.; LESIA, Observatoire de Paris, place Jules Janssen, 92195, Meudon Cedex, France
Barge, P.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Bonomo, A. S.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Bouchy, F.; Observatoire de Haute-Provence, Saint-Michel-l'Observatoire, 04670, France ; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98bis boulevard Arago, 75014, Paris, France ; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Cabrera, J.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany
Carpano, S.; Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG, Noordwijk, The Netherlands
Csizmadia, Sz; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany
Cochran, W. D.; McDonald Observatory, University of Texas at Austin, Austin, TX, 78712, USA
Deeg, H. J.; Instituto de Astrofísica de Canarias, 38205, La Laguna, Tenerife, Spain ; Dpto. de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain
Díaz, R. F.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France ; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Dvorak, R.; University of Vienna, Institute of Astronomy, Türkenschanzstr. 17, 1180, Vienna, Austria
Erikson, A.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany
Ferraz-Mello, S.; IAG, University of São Paulo, Department of Astronomy, Office F209, rua do Matão, 1226, Cid. Universitária, 05.508-090, São Paulo 2013, SP, Brazil
Fridlund, M.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany ; Research and Scientific Support Department, ESTEC/ESA, PO Box 299, 2200 AG, Noordwijk, The Netherlands
Fruth, T.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany ; German Space Operations Center, German Aerospace Center, Münchner Strasse 20, 82234, Weßling, Germany
Gandolfi, D.; Landessternwarte Königstuhl, Zentrum für Astronomie der Universität Heidelberg, Königstuhl 12, 69117, Heidelberg, Germany
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Grziwa, S.; Rheinisches Institut für Umweltforschung, Abteilung Planetenforschung, an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
Guillot, T.; Université de Nice-Sophia Antipolis, CNRS UMR 6202, Observatoire de la Côte d'Azur, BP 4229, 06304, Nice Cedex 4, France
Hébrard, G.; Observatoire de Haute-Provence, Saint-Michel-l'Observatoire, 04670, France ; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre et Marie Curie, 98bis boulevard Arago, 75014, Paris, France
Jorda, Laurent; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Ollivier, M.; Institut d'Astrophysique Spatiale, Université Paris-Sud & CNRS, 91405, Orsay, France
Pasternacki, T.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany
Pätzold, M.; Rheinisches Institut für Umweltforschung, Abteilung Planetenforschung, an der Universität zu Köln, Aachener Strasse 209, 50931, Köln, Germany
Queloz, D.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Rauer, H.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany ; Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623, Berlin, Germany
Rouan, D.; LESIA, Observatoire de Paris, place Jules Janssen, 92195, Meudon Cedex, France
Santerne, A.; Laboratoire d'Astrophysique de Marseille, CNRS & Aix-Marseille University, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France ; Centro de Astrofísica, Universidade do Porto, rua das Estrelas, 4150-762, Porto, Portugal
Schneider, J.; LUTH, Observatoire de Paris, CNRS, Université Paris Diderot, 5 place Jules Janssen, 92195, Meudon, France
Tadeu dos Santos, M.; IAG, University of São Paulo, Department of Astronomy, Office F209, rua do Matão, 1226, Cid. Universitária, 05.508-090, São Paulo 2013, SP, Brazil
Tingley, B.; Instituto de Astrofísica de Canarias, 38205, La Laguna, Tenerife, Spain ; Dpto. de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain ; Institut for Fysik og Astronomi, Aarhus Universitet, Ny Munkegade 120, 8000, Aarhus C, Denmark
Titz-Weider, R.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489, Berlin, Germany
Weingrill, J.; Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042, Graz, Austria
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