High Angular Resolution Imaging And Infrared Spectroscopy Of CoRoT Candidates
High Angular Resolution Imaging And Infrared Spectroscopy Of CoRoT Candidates
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CoRoT 候选物的高角分辨率成像和红外光谱
DOI：
10.1051/0004-6361/201220902
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发表时间：
2013
影响因子：
6.5
通讯作者：
Tingley
中科院分区：
文献类型：
--
作者：
Guenther;Fridlund;Alonso;Carpano;Deleuil;Dreizler;Gandolfi;Gillon;Guillot;Léger;Moutou;Nortmann;Samuel;Schneider;Tingley
ContextStudies 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.AimsFor 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.MethodsWe observed 20 candidates with the adaptive optics imager NaCo and 18 with the high-resolution infrared spectrograph CRIRES.ResultsWe found previously unknown stars within 2′′ 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.ConclusionsGiven that the companion candidates cluster around the targets and that theJ−Kcolours are consistent with physical companions, we conclude that the companion candidates are more likely to be physical companions rather than unrelated field stars.
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