Planetary Companions to the Metal-rich Stars BD –10°3166 and HD 52265^*

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 M sin i = 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 M sin i = 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 M sin i 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 843 and sin i 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.