A&A 485, 871-875 (2008)
Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbitM. Gillon1, A. H. M. J. Triaud1, M. Mayor1, D. Queloz1, S. Udry1, and P. North2
1 Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
2 Laboratoire d'Astrophysique, École Polytechnique Fédérale de Lausanne (EPFL), Observatoire de Sauverny, 1290 Versoix, Switzerland
Received 12 December 2007 / Accepted 12 April 2008
We report high-precision transit photometry for the recently detected planet HD 17156b. Using these new data with previously published transit photometry and radial velocity measurements, we perform a combined analysis based on a Markov Chain Monte Carlo approach. The resulting mass and radius for the planet places it at the outer edge of the density distribution of known transiting planets with . The obtained transit ephemeris is BJD. The derived plausible tidal circularization time scales for HD 17156b are larger than the age of the host star. The measured high orbital eccentricity e = 0.6719+0.0052-0.0063 can thus not be interpreted as the clear sign of the presence of another body in the system.
Key words: binaries: eclipsing -- planetary systems -- stars: individual: HD 17156 -- techniques: photometric
© ESO 2008