期刊
ASTRONOMY & ASTROPHYSICS
卷 506, 期 1, 页码 377-384出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200911897
关键词
binaries: eclipsing; techniques: photometric; techniques: radial velocities; planetary systems; stars: individual: CoRoT-3b, HD 189733
资金
- Swiss Fond National de Recherche
- STFC [PP/D000890/1, PP/F000065/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D000890/1, PP/F000065/1] Funding Source: researchfish
We present radial-velocity sequences acquired during three transits of the exoplanet HD 189733b 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 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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