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When a planet occults a spotty area on a stellar surface, the flux increasesand a characteristic feature in a light curve - a bump - is observed. Among theplanets detected by the CoRoT-mission CoRoT-18 is especially interesting as itexhibited spot crossings that we have analysed in detail. We used fourground-based observations obtained at a 1.5-m telescope in Spain and the 13available CoRoT-transits to refine and constrain stellar, planetary andgeometrical parameters of the system. We found that the derived physicalproperties slightly deviate from the previously published values, most likelydue to the different treatment of the stellar activity. Following a spot overseveral transits enabled us to measure the stellar rotation period and thespin-orbit alignment. Our derived values of Prot=5.19 +/- 0.03 d and Lambda=6+/- 13 deg are in agreement with the literature values that were obtained withother methods. Although we cannot exclude a very old age for CoRoT-18, ourobservations support the young star hypothesis and, hence, yield constraints onthe time-scale of planet formation and migration.

CoRoT-18 b: Analysis of high-precision transit light curves with starspot features