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We report the detection of CoRoT-18b, a massive hot jupiter transiting infront of its host star with a period of 1.9000693 +/- 0.28 days. Thisplanet was discovered thanks to photometric data secured with the CoRoTsatellite combined with spectroscopic and photometric ground-based follow-upobservations. The planet has a mass M_p = 3.47 +/- 0.38 M_Jup, a radius R_p =1.31 +/- 0.18 R_Jup, and a density rho_p = 2.2 +/- 0.8 g/cm3. It orbits a G9Vstar with a mass M_* = 0.95 +/- 0.15 M_Sun, a radius R_* = 1.00 +/- 0.13 R_Sun,and a rotation period P_rot = 5.4 +/- 0.4 days. The age of the system remainsuncertain, with stellar evolution models pointing either to a few tens Ma orseveral Ga, while gyrochronology and lithium abundance point towards ages of afew hundred Ma. This mismatch potentially points to a problem in ourunderstanding of the evolution of young stars, with possibly significantimplications for stellar physics and the interpretation of inferred sizes ofexoplanets around young stars. We detected the Rossiter-McLaughlin anomaly inthe CoRoT-18 system thanks to the spectroscopic observation of a transit. Wemeasured the obliquity psi = 20 +/- 20 degrees (sky-projected value: lambda =-10 +/- 20 degrees), indicating that the planet orbits in the same way as thestar is rotating and that this prograde orbit is nearly aligned with thestellar equator.

Transiting exoplanets from the CoRoT space mission. XVIII. CoRoT-18b: a massive hot jupiter on a prograde, nearly aligned orbit