planets and satellites: detection; stars: fundamental parameters; techniques: photometric; techniques: spectroscopic; techniques: radial velocities; planets and satellites: fundamental parameters
Abstract :
[en] <BR /> Aims: We report the discovery of CoRoT-8b, a dense small Saturn-class exoplanet that orbits a K1 dwarf in 6.2 days, and we derive its orbital parameters, mass, and radius. <BR /> Methods: We analyzed two complementary data sets: the photometric transit curve of CoRoT-8b as measured by CoRoT and the radial velocity curve of CoRoT-8 as measured by the HARPS spectrometer. <BR /> Results: We find that CoRoT-8b is on a circular orbit with a semi-major axis of 0.063 ± 0.001 AU. It has a radius of 0.57 ± 0.02 R[SUB]J[/SUB], a mass of 0.22 ± 0.03 M[SUB]J[/SUB], and therefore a mean density of 1.6 ± 0.1 g cm[SUP]-3[/SUP]. <BR /> Conclusions: With 67% of the size of Saturn and 72% of its mass, CoRoT-8b has a density comparable to that of Neptune (1.76 g cm[SUP]-3[/SUP]). We estimate its content in heavy elements to be 47-63 {M}_⊕, and the mass of its hydrogen-helium envelope to be 7-23 {M}_⊕. At 0.063 AU, the thermal loss of hydrogen of CoRoT-8b should be no more than 0.1% over an assumed integrated lifetime of 3 Ga. Observations made with SOPHIE spectrograph at Observatoire de Haute Provence, France (PNP.07B.MOUT), and the HARPS spectrograph at ESO La Silla Observatory (081.C-0388 and 083.C-0186). The CoRoT space mission, launched on December 27, 2006, has been developed and is operated by the CNES with the contribution of Austria, Belgium, Brasil, ESA, Germany, and Spain.Both data sets are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/520/A66">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/520/A66</A>
Bouchy, F.; Institut d'astrophysique de Paris, Université Paris 6 & CNRS (UMR 7095), 98 bd Arago, 75014 Paris, France ; Observatoire de Haute-Provence, CNRS & OAMP, 04870 St-Michel l'Observatoire, France
Deleuil, M.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Cabrera, J.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany ; Laboratoire de l'univers et de ses théories, Observatoire de Paris & CNRS (UMR 8102), 5 place Jules Janssen, 92195 Meudon, France
Jorda, L.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Lovis, C.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Csizmadia, S.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany
Aigrain, S.; Department of Physics, Denys Wilkinson Building Keble Road, Oxford, OX1 3RH, UK
Almenara, J. M.; Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Alonso, R.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Auvergne, M.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France
Baglin, A.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France
Barge, P.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Bonomo, A. S.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Bruntt, H.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France
Carone, L.; Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Str. 209, 50931 Köln, Germany
Carpano, S.; Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands
Deeg, H.; Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Dvorak, R.; Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180, Vienna, Austria
Erikson, A.; Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, 12489 Berlin, Germany
Ferraz-Mello, S.; Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Brasil
Fridlund, M.; Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands
Gandolfi, D.; Research and Scientific Support Department, European Space Agency, Keplerlaan, 2200AG, Noordwijk, The Netherlands ; Thüringer Landessternwarte, 07778 Tautenburg, Germany
Gazzano, J*-C; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Mayor, M.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Mazeh, T.; Wise Observatory, Tel Aviv University, Tel Aviv 69978, Israel
Moutou, C.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Pätzold, M.; Rheinisches Institut für Umweltforschung an der Universität zu Köln, Aachener Str. 209, 50931 Köln, Germany
Pepe, F.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Ollivier, M.; Institut d'astrophysique spatiale, Université Paris-Sud 11 & CNRS (UMR 8617), Bât. 121, 91405 Orsay, France
Queloz, D.; Observatoire de Genève, Université de Genève, 51 Ch. 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, Hardenbergstrasse 36, 10623 Berlin, Germany
Rouan, D.; LESIA, UMR 8109 CNRS, Observatoire de Paris, UPMC, UniversitéParis-Diderot, 5 place J. Janssen, 92195 Meudon, France
Santerne, A.; Laboratoire d'astrophysique de Marseille, Université de Provence & CNRS (UMR 6110), 38 rue F. Joliot-Curie, 13388 Marseille, France
Schneider, J.; Laboratoire de l'univers et de ses théories, Observatoire de Paris & CNRS (UMR 8102), 5 place Jules Janssen, 92195 Meudon, France
Tingley, B.; Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Udry, S.; Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Weingrill, J.; Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, Graz, Austria
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