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The Rossiter-McLaughlin effect of CoRoT-3b and HD189733b * **

AutorTriaud, Amaury H. M. J.; Queloz, Didier; Bouchy, F.; Moutou, Claire; Cameron, A. C.; Barge, P.; Benz, W. W; Deleuil, M.; Guillot, T.; Hébrard, G.
Palabras clavebinaries: eclipsing
techniques: photometric
techniques: radial velocities
planetary systems
stars: individual: CoRoT-3b, HD189733
Fecha de publicaciónjul-2009
EditorEDP Sciences
CitaciónAstronomy and Astrophysics, 506,377-384, 2009
ResumenWe 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 V sin(I) for both stars.
Versión del editorhttp://dx.doi.org/10.1051/0004-6361/200911897
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