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Context. The CoRoT satellite searches for planets by applying the transitmethod, monitoring up to 12 000 stars in the galactic plane for 150 days ineach observation run. This search is contaminated by a large fraction of falsepositives, caused by different binary configurations that might be confusedwith a transiting planet. Aims. We evaluate the rates and nature of falsepositives in the CoRoT exoplanets search and compare our results withsemiempirical predictions. Methods. We consider the detected binary and planetcandidates in the first three extended CoRoT runs, and classify the results ofthe follow-up observations completed to verify their planetary nature. We groupthe follow-up results into undiluted binaries, diluted binaries, and planetsand compare their abundances with predictions from the literature. Results. 83%of the initial detections are classified as false positives using only theCoRoT light-curves, the remaining 17% require follow-up observations. Finally,12% of the follow-up candidates are planets. The shape of the overalldistribution of the false positive rate follows previous predictions, exceptfor candidates with transit depths below about 0.4%. For candidates withtransit depths in the range from 0.1 - 0.4%, CoRoT detections are nearlycomplete, and this difference from predictions is probably real and dominatedby a lower than expected abundance of diluted eclipsing binaries.

Rate and nature of false positives in the CoRoT exoplanet search