Abstract
Context: CoRoT is a pioneering space mission whose primary goals are stellar seismology and extrasolar planets search. Its surveys of large stellar fields generate numerous planetary candidates whose lightcurves have transit-like features. An extensive analytical and observational follow-up effort is undertaken to classify these candidates. Aims: The list of planetary transit candidates from the CoRoT LRa01 star field in the Monoceros constellation towards the Galactic anti-center is presented. The CoRoT observations of LRa01 lasted from 24 October 2007 to 3 March 2008. Methods: 7470 chromatic and 3938 monochromatic lightcurves were acquired and analysed. Instrumental noise and stellar variability were treated with several filtering tools by different teams from the CoRoT community. Different transit search algorithms were applied to the lightcurves. Results: Fifty-one stars were classified as planetary transit candidates in LRa01. Thirty-seven (i.e., 73 % of all candidates) are "good" planetary candidates based on photometric analysis only. Thirty-two (i.e., 87 % of the "good" candidates) have been followed-up. At the time of this writing twenty-two cases have been solved and five planets have been discovered: three transiting hot-Jupiters (CoRoT-5b, CoRoT-12b, and CoRoT-21b), the first terrestrial transiting planet (CoRoT-7b), and another planet in the same system (CoRoT-7c, detected by radial velocity survey only). Evidences of another non-transiting planet in the CoRoT-7 system, namely CoRoT-7d, have been recently found.
Highlights
We here summarize the planetary candidates found in the LRa01 exoplanet star field and some preliminary scientific results from the combination of CoRoT photometry with groundbased follow-up observations
AAOmega observations classify the target as an F7 dwarf star, in good agreement with the classification listed in Exo-Dat (F8 IV)
Two moderate S /N ≈ 35 ratio SOPHIE spectra reveal a lowcontrast single peak cross-correlation function (CCF) with an radial velocity (RV) variation of about 52 km s−1, in anti-phase with the CoRoT ephemeris, i.e., the eclipses occur on the rising part of the RV curve and are caused by the star whose CCF peak is detected in the SOPHIE spectra
Summary
We here summarize the planetary candidates found in the LRa01 exoplanet star field and some preliminary scientific results from the combination of CoRoT photometry with groundbased follow-up observations. The CoRoT IRa01 and LRc01 runs have already been reported by Carpano et al (2009) and Moutou et al (2009), and Cabrera et al (2009), respectively. The LRa01 run, from 24 October 2007 to 3 March 2008, was the second long pointing of CoRoT after the LRc01 field (Cabrera et al 2009). Fifty-one transit candidates have been identified in LRa01 (Tables 5 and 6). Identified variable stars of the first four CoRoT exoplanet star fields are reported in Debosscher et al (2009). We report on the characteristics of the LRa01 star-field A description of all detected transit candidates is presented in Sect. The CoRoT space mission, launched on December 27, 2006, has been developed and is operated by CNES, with contributions of Austria, Belgium, Brazil, ESA (RSSD and Science Program), Germany and Spain
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