Talk abstract details

False-positives in transit-search programs
Guenther, E.W., Alonso, R., Carpano, S., Deeg, H. J., Deleuil, M., Dreizler, St., Endl. M., Fridlund, M., Gandolfi, D., Gillon, M., Guillot, T., Jehin, E., L\'eger, A., Moutou, C., Nortmann, L., Rouan, D., Samuel, B., Schneider, J., Tingley , B.


An important part of transit-search programs is the removal of
false-positives. Thanks to the very high photometric accuracy achieved
with CoRoT, the majority of the false-positives are already removed by
the detailed analysis of the light-curves. It is also expected that
most of the remaining ones are removed by seeing-limited imaging in-
and out-of-transit. The critical question thus is how many of the
candidates that passed these tests are still false-positives. Such
false-positives can be caused by eclipsing binaries, which are either
related, or unrelated to the targets. In order to detect faint stars
close to the targets, 23 CoRoT-candidates were selected and then
observed with the adaptive optics imager NaCo and the high-resolution
infrared spectrograph CRIRES. In this talk we will show that companion
candidates found could not have been detected with seeing limited
imaging, or the analysis of the light curves. We will henceforth
compare the rate of companion-candidates found with the expectations,
and conclude that such objects are not only present in CoRoT-data but
a general feature of transit search programs.

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