[en] This paper presents the case of CoRoT LRa02_E2_0121, which was initially classified as a Neptune-size transiting-planet candidate on a relatively wide orbit of 36.3 days. Follow-up observations were performed with UVES, Sandiford, SOPHIE, and HARPS. These observations revealed a faint companion in the spectra. To find the true nature of the system we derived the radial velocities of the faint companion using TODMOR - a two-dimensional correlation technique, applied to the SOPHIE spectra. Modeling the lightcurve with EBAS we discovered a secondary eclipse with a depth of ~0.07%, indicating a diluted eclipsing binary. Combined MCMC modeling of the lightcurve and the radial velocities suggested that CoRoT LRa02_E2_0121 is a hierarchical triple system with an evolved G-type primary and an A-type:F-type grazing eclipsing binary. Such triple systems are difficult to discover. Based on observations made with the 1.93-m telescope at Observatoire de Haute-Provence (CNRS), France, the 3.6-m telescope at La Silla Observatory (ESO), Chile (program 184.C-0639), the VLT at Paranal Observatory (ESO), Chile (program 083.C-0690), and the 2.1-m Otto Struve telescope at McDonald Observatory, Texas, USA.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Tal-Or, L.; School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
Santerne, A.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Mazeh, T.; School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
Bouchy, F.; Observatoire de Haute Provence, CNRS/OAMP, 04870 St Michel l', Observatoire, France ; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014, Paris, France
Moutou, C.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Alonso, R.; Observatoire de l'Université de Genève, 51 chemin des Maillettes, 1290, Sauverny, Switzerland
Gandolfi, D.; Research and Scientific Support Department, ESTEC/ESA, Keplerlaan 1, 2200AG, Noordwijk, The Netherlands
Auvergne, M.; LESIA, Observatoire de Paris, Place Jules Janssen, 92195, Meudon Cedex, France
Barge, P.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Bonomo, A. S.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Bordé, P.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405, Orsay, France
Deeg, H.; Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain ; Universidad de La Laguna, Dept. de Astrofísica, 38200 La Laguna, Tenerife, Spain
Ferraz-Mello, S.; IAG, University of São Paulo, Brasil
Deleuil, M.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
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
Fridlund, M.; Research and Scientific Support Department, ESTEC/ESA, Keplerlaan 1, 2200AG, Noordwijk, The Netherlands
Gillon, Michaël ; Oxford Astrophyiscs, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, UK ; University of Liège, Allée du 6 août 17, Sart Tilman, Liège 1, Belgium
Jorda, L.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Lammer, H.; Space Research Institute, Austrian Academy of Science, Schmiedlstr. 6, 8042, Graz, Austria
Léger, A.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405, Orsay, France
Llebaria, A.; Laboratoire d'Astrophysique de Marseille, Université de Provence & CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille Cedex 13, France
Ollivier, M.; Institut d'Astrophysique Spatiale, Université Paris XI, 91405, Orsay, France
Pätzold, M.; Rheinisches Institut für Umweltforschung 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
Tsodikovich, Y.; School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel
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