2009A&A...506..377T

We present radial-velocity sequences acquired during three transits of the exoplanet HD189733b and one transit of CoRoT-3b. We applied a combined Markov-chain Monte-Carlo analysis of spectroscopic and photometric data on these stars, to determine a full set of system parameters including the projected spin-orbit misalignment angle of HD189733b to an unprecedented precision via the Rossiter-McLaughlin effect: β=0.85^+ 0.32^_–0.28°. This small but non-zero inclination of the planetary orbit is important to understand the origin of the system. On CoRoT-3b, results seem to point towards a non-zero inclination as well with β=37.6^+10.0_–22.3°, but this remains marginal. Systematic effects due to non-Gaussian cross-correlation functions appear to be the main cause of significant residuals that prevent an accurate determination of the projected stellar rotation velocity Vsin (I) for both stars.