The Rossiter-McLaughlin effect of CoRoT-3b and HD 189733b
Abstract
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: β = 0.85 circ + 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=37.6circ + 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.
Using observations with the Harps spectrograph from the ESO 3.6 m installed at La Silla, Chile, under the allocated programmes 072.C-0488(E) and 079.C-0828(A). The data is publicly available in electronic form at the CDS. Tables 3 and 4 are only available in electronic form at http://www.aanda.org- Publication:
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Astronomy and Astrophysics
- Pub Date:
- October 2009
- DOI:
- 10.1051/0004-6361/200911897
- arXiv:
- arXiv:0907.2956
- Bibcode:
- 2009A&A...506..377T
- Keywords:
-
- binaries: eclipsing;
- techniques: photometric;
- techniques: radial velocities;
- planetary systems;
- stars: individual: CoRoT-3b;
- HD 189733;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 7 pages, 4 figures, accepted in A&