High Angular Resolution Imaging And Infrared Spectroscopy Of CoRoT Candidates

dc.contributor.utaustinauthorEndl, M.en_US
dc.creatorGuenther, E. W.en_US
dc.creatorFridlund, M.en_US
dc.creatorAlonso, R.en_US
dc.creatorCarpano, S.en_US
dc.creatorDeeg, H. J.en_US
dc.creatorDeleuil, M.en_US
dc.creatorDreizler, S.en_US
dc.creatorEndl, M.en_US
dc.creatorGandolfi, D.en_US
dc.creatorGillon, M.en_US
dc.creatorGuillot, T.en_US
dc.creatorJehin, E.en_US
dc.creatorLeger, A.en_US
dc.creatorMoutou, C.en_US
dc.creatorNortmann, L.en_US
dc.creatorRouan, D.en_US
dc.creatorSamuel, B.en_US
dc.creatorSchneider, J.en_US
dc.creatorTingley, B.en_US
dc.description.abstractContext. Studies of transiting extrasolar planets are of key importance for understanding the nature of planets outside our solar system because their masses, diameters, and bulk densities can be measured. An important part of transit-search programmes is the removal of false-positives. In the case of the CoRoT space mission, the majority of the false-positives are removed by a detailed analysis of the light curves and by seeing-limited imaging in- and out-of-transit. However, the critical question is how many of the candidates that passed all these tests are false-positives. Such false-positives can be caused by eclipsing binaries, which are either related or unrelated to the targets. Aims. For our study we selected 25 CoRoT candidates that have already been screened against false-positives using detailed analysis of the light curves and seeing-limited imaging, which has transits that are between 0.7 and 0.05% deep. Our aim is to search for companion candidates that had not been recognized in previous observations. Methods. We observed 20 candidates with the adaptive optics imager NaCo and 18 with the high-resolution infrared spectrograph CRIRES. Results. We found previously unknown stars within 2 0 0 of the targets in seven of the candidates. All of these are too faint and too close to the targets to have been previously detected with seeing-limited telescopes in the optical. Our study thus leads to the surprising results that if we remove all candidates excluded by the sophisticated analysis of the light-curve, as well as carrying out deep imaging with seeing-limited telescopes, still 28 35% of the remaining candidates are found to possess companions that are bright enough to be false-positives. Conclusions. Given that the companion candidates cluster around the targets and that the J - K colours are consistent with physical companions, we conclude that the companion candidates are more likely to be physical companions rather than unrelated field stars.en_US
dc.description.sponsorshipSpanish Ministerio de Ciencia e Innovacion ESP2007-65480-C02-02, AYA2010-20982-C02-02en_US
dc.description.sponsorship>Astronomie & Internet> program of the Alfred Krupp von Bohlen und Halbach Foundationen_US
dc.description.sponsorshipBelgian Fund for Scientific Research (Fond National de la Recherche Scientifique, FNRS) FRFC 2.5.594.09en_US
dc.identifier.citationGuenther, E. W., M. Fridlund, R. Alonso, S. Carpano, H. J. Deeg, M. Deleuil, S. Dreizler et al. >High angular resolution imaging and infrared spectroscopy of CoRoT candidates.> Astronomy & Astrophysics, Vol. 556 (Aug., 2013): A75.en_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectplanetary systemsen_US
dc.subjectbinaries: visualen_US
dc.subjectbinaries: eclipsingen_US
dc.subjectplanetary transit candidatesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHigh Angular Resolution Imaging And Infrared Spectroscopy Of CoRoT Candidatesen_US

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