The Rossiter-McLaughlin effect of CoRoT-3b & HD189733b
Triaud, Amaury H. M. J. · Queloz, Didier · Bouchy, Francois · Moutou, Claire · Cameron, Andrew Collier · Claret, Antonio · Barge, Pierre · Benz, Willy · Deleuil, Magali · Guillot, Tristan · Hébrard, Guillaume · Étangs, Alain Lecavelier des · Lovis, Christophe · Mayor, Michel · Pepe, Francesco · Udry, Stéphane
Original · EN
We present radial-velocity sequences acquired during three transits of the exoplanet HD 189733b and one transit of the 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 project spin-orbit misalignement angle of HD 189733b to an unprecedented precision via the Rossiter-McLaughlin effect: beta = 0.85 degrees (+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 beta = 37.6 degrees (+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 V sin(I) for both stars.
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