AAS 205th Meeting, 9-13 January 2005
Session 11 Brown Dwarfs and Exoplanets
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

[11.05] Bayesian Extrasolar Planet Detection

P. C. Gregory (Univ. of British Columbia)

Precision radial velocity data for HD 73526 has been re-analyzed using a new Bayesian parallel tempering Markov Chain Monte Carlo algorithm. For a single planet model three possible orbits are found with periods of 376, 128, and 190 days with probabilities of 0.88, 0.09, 0.03, respectively. The most probable orbit has a period of 376.0-3.3+2.3 days and an eccentricity of 0.10-0.10+0.04 and yields an M \sin i = 5.32 -1.3+1.5. The previously reported orbit (Tinney et al. Ap.J. 587, 423, 2003) of 190.5 ±3.0 days and eccentricity of 0.34 ±0.08 corresponds to our least probable orbit.