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In this paper, we report a refined determination of the orbital parametersand the detection of the Rossiter-McLaughlin effect of the recently discoveredtransiting exoplanet HD147506b (HAT-P-2b). The large orbital eccentricity atthe short orbital period of this exoplanet is unexpected and is distinguishingfrom other known transiting exoplanets. We performed high-precision radialvelocity spectroscopic observations of HD147506 (HAT-P-2) with the newspectrograph SOPHIE, mounted on the 1.93 m telescope at the Haute-Provenceobservatory (OHP). We obtained 63 new measurements, including 35 on May 14 and20 on June 11, when the planet was transiting its parent star. The radialvelocity (RV) anomaly observed illustrates that HAT-P-2b orbital motion is setin the same direction as its parent star spin. The sky-projected angle betweenthe normal of the orbital plane and the stellar spin axis, \lambda = 0.2 +12.2-12.5 deg, is consistent with zero. The planetary and stellar radii werere-determined, yielding R_p = 0.951 +0.039 -0.053 R_Jup, R_s = 1.416 +0.040-0.062 R_Sun. The mass M_p = 8.62 +0.39 -0.55 M_Jup and radius of HAT-P-2bindicate a density of 12.5 +2.6 -3.6 g cm^{-3}, suggesting an object in betweenthe known close-in planets with typical density of the order of 1 g cm^{-3},and the very low-mass stars, with density greater than 50 g cm^{-3}.

Refined parameters and spectroscopic transit of the super-massive planet HD147506b