Based on observations made at the 1.93-m telescopes at Observatoire de Haute-Provence (CNRS), France with the SOPHIE spectrograph.
Orbital eccentricity of WASP-12 and WASP-14 from new radial velocity monitoring with SOPHIE★
Version of Record online: 25 MAR 2011
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
Monthly Notices of the Royal Astronomical Society
Volume 413, Issue 4, pages 2500–2508, June 2011
How to Cite
Husnoo, N., Pont, F., Hébrard, G., Simpson, E., Mazeh, T., Bouchy, F., Moutou, C., Arnold, L., Boisse, I., Díaz, R. F., Eggenberger, A. and Shporer, A. (2011), Orbital eccentricity of WASP-12 and WASP-14 from new radial velocity monitoring with SOPHIE. Monthly Notices of the Royal Astronomical Society, 413: 2500–2508. doi: 10.1111/j.1365-2966.2011.18322.x
- Issue online: 20 MAY 2011
- Version of Record online: 25 MAR 2011
- Accepted 2011 January 10. Received 2010 December 13; in original form 2010 April 13
- planet–star interactions;
- planetary systems
As part of the long-term radial velocity monitoring of known transiting planets, we have acquired new radial velocity data for the two transiting systems WASP-12 and WASP-14, each harbouring a gas giant on a close orbit (orbital period of 1.09 and 2.24 d, respectively). In both cases, the initial orbital solution suggested a significant orbital eccentricity, 0.049 ± 0.015 for WASP-12b and 0.091 ± 0.003 for WASP-14b. Since then, measurements of the occultation of WASP-12 in the infrared have indicated that one projection of the eccentricity (e cos ω) was close to zero, casting doubt on the eccentricity from the initial radial velocity orbit. Our measurements show that the radial velocity data are compatible with a circular orbit. A MCMC analysis taking into account the presence of correlated systematic noise in both the radial velocity and photometric data gives e= 0.017+0.015−0.010. In contrast, we confirm the orbital eccentricity of WASP-14b, and refine its value to e= 0.0877 ± 0.0030, a 10σ detection. WASP-14b is thus the closest presently known planet with a confirmed eccentric orbit.