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Context: Photometric observations for the OGLE-II microlens monitoringcampaign have been taken in the period 1997-2000. All light curves of thiscampaign have recently been made public. Our analysis of these data hasrevealed 13 low-amplitude transiting objects among ~15700 stars in three Carinafields towards the galactic disk. One of these objects, OGLE2-TR-L9 (P~2.5days), turned out to be an excellent transiting planet candidate.  Aims: In this paper we report on our investigation of the true nature ofOGLE2-TR-L9, by re-observing the photometric transit with the aim to determinethe transit parameters at high precision, and by spectroscopic observations, toestimate the properties of the host star, and to determine the mass of thetransiting object through radial velocity measurements.  Methods: High precision photometric observations have been obtained in g',r', i', and z' band simultaneously, using the new GROND detector, mounted onthe MPI/ESO 2.2m telescope at La Silla. Eight epochs of high-dispersionspectroscopic observations were obtained using the fiber-fed FLAMES/UVESEchelle spectrograph, mounted on ESO's Very Large Telescope at Paranal.  Results: The photometric transit, now more than 7 years after the lastOGLE-II observations, was re-discovered only ~8 minutes from its predictedtime. The primary object is a fast rotating F3 star, with vsini=39.33+-0.38km/s, T=6933+-58 K, log g = 4.25+-0.01, and [Fe/H] = -0.05+-0.20. Thetransiting object is an extrasolar planet with M_p=4.5+-1.5 M_Jup andR_p=1.61+-0.04 R_Jup. The rejection of possible blend scenarios was based on aquantitative analysis of the multi-color photometric data [abridged].

OGLE2-TR-L9: An extrasolar planet transiting a fast-rotating F3 star