Accurate radius and mass of the transiting exoplanet OGLE-TR-132b

The exoplanet OGLE-TR-132b belongs to the new class of very hot giant planets, together with OGLE-TR-56b and OGLE-TR-113b, detected by their transits. Recently, radial velocity measurements provided a planetary mass estimate for OGLE-TR-132b. The planet parameters, however, were poorly constrained, because of the very shallow transit in the OGLE light curve. In this letter, based on new VLT/FORS2 photometric follow-up of OGLE-TR-132 of unprecedented quality (1.2 mmag relative photometry), we confirm the planetary nature of the orbiting object, and we derive an accurate measurement of its radius and mass: 1.13+/-0.08 R-J and 1.19+/-0.13 M-J. The refined ephemeris of OGLE-TR- 132 transits is T-0=2453 142.5888 and P=1.689857 days.