| Photometric searches for transiting planets: results and challenges (2005) | |||||||||
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| Ground-based photometric surveys have led to the discovery of six transiting exoplanets, five of which were detected by the OGLE survey. The FLAMES multi-object spectrograph on the VLT has permitted a very efficient follow-up of the OGLE transit candidates, characterising not only the 5 planets but also more than 50 systems producing similar photometric signatures -- mainly eclipsing binaires. The presence of these ubiquitous "impostors" is a challenge for transit surveys. Another difficulty is the presence of red noise in the photometry, which implies a much lower sensitivity to transiting planets than usually assumed. We outline a method to estimate how the red noise will affect the expected yield of photometric transit searches.. Comment: 12 pages. To appear in the proceedings of the meeting "Tenth anniversary of 51Peg b - status and prospects of hot Jupiter studies" at OHP, France, 22-26 August 2005 | |||||||||
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