PRE-DISCOVERY OBSERVATIONS OF CoRoT-1b AND CoRoT-2b WITH THE BEST SURVEY

摘要

The Berlin Exoplanet Search Telescope (BEST) wide-angle telescope installed at the Observatoire de Haute-Provence and operated in remote control from Berlin by the Institut fur Planetenforschung, DLR, has observedthe CoRoT target fields prior to the mission. The resulting archive of stellar photometric light curves is used tosearch for deep transit events announced during CoRoT's alarm mode to aid in fast photometric confirmationof these events. The "initial run" field of CoRoT (IRa01) was observed with BEST in 2006 November andDecember for 12 nights. The first "long run" field (LRc01) was observed from 2005 June to Septemberfor 35 nights. After standard CCD data reduction, aperture photometry has been performed using the ISISimage subtraction method. About 30,000 light curves were obtained in each field. Transits of the first detectedplanets by the CoRoT mission, CoRoT-lb and CoRoT-2b, were found in archived data of the BEST surveyand their light curves are presented here. Such detections provide useful information at the early stage ofthe organization of follow-up observations of satellite alarm-mode planet candidates. In addition, no periodchange was found over —4 years between the first BEST observation and last available transit observations.