Journal
ASTRONOMY & ASTROPHYSICS
Volume 485, Issue 3, Pages 871-875Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20079238
Keywords
binaries : eclipsing; planetary systems; stars : individual : HD 17156; techniques : photometric
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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 M(p) = 3.09(-0.17)(+0.22) M(Jup) and radius R(p) = 1.23(-0.20)(+0.17) R(Jup) for the planet places it at the outer edge of the density distribution of known transiting planets with rho(p) = 1.66(-0.60)(+1.37) rho(Jup). The obtained transit ephemeris is T(Tr) = 2 454 438.48271(-0.00057)(+0.00077) + N x 21.21747(- 0.00067)(+0.00070) 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(-0.0063)(+0.0052) can thus not be interpreted as the clear sign of the presence of another body in the system.
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