• Butler, R. Paul
;
• Vogt, Steven S.
;
• Marcy, Geoffrey W.
;
• Fischer, Debra A.
;
• Henry, Gregory W.
;
• Apps, Kevin

Abstract

Precise Doppler measurements from the Keck/HIRES spectrometer reveal periodic Keplerian velocity variations in the stars BD -10°3166 and HD 52265. BD -10°3166 (K0 V) has a period of 3.487 days and a semiamplitude of 61 m s^-1. An orbital fit yields a companion mass Msini=0.48 M_JUP, a semimajor axis of a=0.046 AU, and an eccentricity of e=0.05 (consistent with zero). HD 52265 (G0 V) has a period of 119.0 days, a semiamplitude of 45 m s^-1, an eccentricity of 0.29, a semimajor axis of a=0.49 AU, and companion mass Msini=1.13 M_JUP. Both of these stars are metal-rich and chromospherically inactive. The mean metallicity of the 33 stars that have detected planets is significantly greater than that of typical stars in the solar neighborhood. We present a catalog of the 35 extrasolar planets known to date, with updated orbits and Msini values. Photometry of BD -10°3166 was obtained with an automated telescope to search for transits. No transits were found, indicating that the inclination of the orbit i is less than 84.3d and sini is less than 0.995. The photometry also reveals no photometric variability larger than 0.0008+/-0.0009 mag at the orbital period of the planet. This confirms that neither starspots nor pulsations are the cause of the radial velocity variations in BD -10°3166. Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology.