Article (Scientific journals)
Rate and nature of false positives in the CoRoT exoplanet search
Almenara, J. M.; Deeg, H. J.; Aigrain, S. et al.
2009In Astronomy and Astrophysics, 506, p. 337-341
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Keywords :
techniques: photometric; stars: binaries: eclipsing; stars: planetary systems
Abstract :
[en] Context: The CoRoT satellite searches for planets by applying the transit method, monitoring up to 12 000 stars in the galactic plane for 150 days in each observing run. This search is contaminated by a large fraction of false positives, caused by different eclipsing binary configurations that might be confused with a transiting planet. <BR />Aims: We evaluate the rates and nature of false positives in the CoRoT exoplanets search and compare our results with semiempirical predictions. <BR />Methods: We consider the detected binary and planet candidates in the first three extended CoRoT runs, and classify the results of the follow-up observations completed to verify their planetary nature. We group the follow-up results into undiluted binaries, diluted binaries, and planets and compare their abundances with predictions from the literature. <BR />Results: 83% of the initial detections are classified as false positives using only the CoRoT light-curves, the remaining 17% require follow-up observations. Finally, 12% of the candidates in the follow-up program are planets. The shape of the overall distribution of the false positive rate follows previous predictions, except for candidates with transit depths below about 0.4%. For candidates with transit depths in the range from 0.1-0.4%, CoRoT detections are nearly complete, and this difference from predictions is probably real and dominated by a lower than expected abundance of diluted eclipsing binaries. 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Almenara, J. M.;  Instituto de Astrofísica de Canarias, C/ Vía Láctea S/N, 38200 La Laguna (Spain)
Deeg, H. J.;  Instituto de Astrofísica de Canarias, C/ Vía Láctea S/N, 38200 La Laguna (Spain)
Aigrain, S.;  School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
Alonso, R.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Auvergne, M.;  LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Baglin, A.;  LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Barbieri, M.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Barge, P.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Bordé, P.;  Institut d'Astrophysique Spatiale, UMR 8617 CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay, France
Bouchy, F.;  Observatoire de Haute Provence, USR 2207 CNRS, OAMP, 04870 St. Michel l'Observatoire, France
Bruntt, H.;  School of Physics A28, University of Sydney, Australia
Cabrera, J.;  Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany ; LUTH, UMR 8102 CNRS, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon, France
Carone, L.;  Rheinisches Institut für Umweltforschung, Universität zu Köln, Abt. Planetenforschung, Aachener Str. 209, 50931 Köln, Germany
Carpano, S.;  Research and Scientific Support Department, European Space Agency, ESTEC, 2200 Noordwijk, The Netherlands
Catala, C.;  LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Csizmadia, Szilard;  Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany
de La Reza, R.;  Observatório Nacional, Rio de Janeiro, RJ, Brazil
Deleuil, M.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Dvorak, R.;  Institute for Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
Erikson, A.;  Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany
Fridlund, M.;  Research and Scientific Support Department, European Space Agency, ESTEC, 2200 Noordwijk, The Netherlands
Gandolfi, D.;  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Gondoin, P.;  Research and Scientific Support Department, European Space Agency, ESTEC, 2200 Noordwijk, The Netherlands
Guenther, E.;  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
Guillot, T.;  Observatoire de la Côte d'Azur, Laboratoire Cassiopée, CNRS UMR 6202, BP 4229, 06304 Nice Cedex 4, France
Hatzes, A.;  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
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, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Lammer, H.;  Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, Austria
Léger, A.;  Institut d'Astrophysique Spatiale, UMR 8617 CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay, France
Llebaria, A.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Loeillet, B.;  Institut d'Astrophysique Spatiale, UMR 8617 CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay, France ; Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Magain, Pierre  ;  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.;  School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
Moutou, C.;  Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-à toile, 13388 Marseille Cedex 13, France
Ollivier, M.;  Institut d'Astrophysique Spatiale, UMR 8617 CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay, France
Pätzold, M.;  Rheinisches Institut für Umweltforschung, Universität zu Köln, Abt. Planetenforschung, Aachener Str. 209, 50931 Köln, Germany
Pont, F.;  School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
Queloz, D.;  Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Rauer, H.;  Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany ; Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
Régulo, C.;  Instituto de Astrofísica de Canarias, C/ Vía Láctea S/N, 38200 La Laguna (Spain) ; Dpto. de Astrofísica, Universidad de La Laguna, La Laguna, 38206 Tenerife, Spain
Renner, S.;  Institute of Planetary Research, DLR, Rutherfordstr. 2, 12489 Berlin, Germany ; Laboratoire d'Astronomie de Lille, Université de Lille 1, 1 impasse de l'Observatoire, 59000 Lille, France ; Institut de Mécanique Céleste et de Calcul des Ephémérides, UMR 8028 du CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France
Rouan, D.;  LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 place J. Janssen, 92195 Meudon, France
Samuel, B.;  Institut d'Astrophysique Spatiale, UMR 8617 CNRS, Bât. 121, Université Paris-Sud, 91405 Orsay, France
Schneider, J.;  LUTH, UMR 8102 CNRS, Observatoire de Paris-Meudon, 5 place J. Janssen, 92195 Meudon, France
Shporer, A.;  School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
Wuchterl, G.;  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
Zucker, S.;  School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
More authors (40 more) Less
Language :
English
Title :
Rate and nature of false positives in the CoRoT exoplanet search
Publication date :
01 October 2009
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
506
Pages :
337-341
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/0908.1172
Available on ORBi :
since 14 January 2010

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