Astronomy and Astrophysics, volume 506, 377-384 (2009/10-4)
The Rossiter-McLaughlin effect of CoRoT-3b and HD 189733b.
TRIAUD A.H.M.J., QUELOZ D., BOUCHY F., MOUTOU C., CAMERON A.C., CLARET A., BARGE P., BENZ W., DELEUIL M., GUILLOT T., HEBRARD G., LECAVELIER DES ETANGS A., LOVIS C., MAYOR M., PEPE F. and UDRY S.
Abstract (from CDS):
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.
binaries: eclipsing - techniques: photometric - techniques: radial velocities - planetary systems - stars: individual: CoRoT-3b, HD189733
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