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2010 CFHT Users Meeting
November 16-18, 2010
ASIAA Auditorium, Taipei, Taiwan

Oral Presentation

Searching for transiting extrasolar planets : the follow-up programme of the CoRoT satellite at CFHT

Author(s): Daniel Rouan

Presenter: Daniel Rouan (LESIA - Observatoire de Paris)

The space mission CoRoT, launched in December 2006, is dedicated to high accuracy stellar photometry and has the capability of detecting exoplanets using the transit method. Today, 16 planets have been detected with a broad range of characteristics in terms of mass, density or period. Determination of small radii, down to terrestrial analogs (1.5 - 2.5 R_Earth) is one important goal of CoRoT. The team provides a number of candidates each semester and ground-based follow-up is crucial to determine their true nature, since many false positives are expected -mainly grazing binary eclipsing stars-. One important tool for CoRoT follow-up is the photometric imaging programme conducted with MEGACAM in g band. Thanks to the telescope size, faint candidates can be observed. With the usually excellent seeing, a very good photometric accuracy can be reached. About 30 candidates are measured each semester during typical time slots of 2 x 15 min minutes. CoRoT observing a field 150 days only, detecting transits from ground on extended periods improves also the ephemeris. CFHT data were important to confirm the smallest planet ever detected (Corot-7b, with R = 1.7 R_Earth !), the first brown dwarf in orbit (Corot- 3b), as well as the long period temperate Corot-9b. The programme and results will be described.

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