Society of the Pacific Planetary Companions Around Two Solar Type Stars: HD

We have enlarged the sample of stars in the planet search at Lick Observatory. Doppler measurements of 82 new stars observed at Lick Observatory, with additional velocities from Keck Observatory, have revealed two new planet candidates. The G3 V/IV star, HD 195019, exhibits Keplerian velocity variations with a period of 18.27 d, an orbital eccentricity of 0.03±0.03, and M sin i = 3.51 MJUP. Based on a measurement of Ca II H&K emission, this star is chromospherically inactive. We estimate the metallicity of HD 195019 to be approximately solar from ubvy photometry. The second planet candidate was detected around HD 217107, a G7V star. This star exhibits a 7.12 d Keplerian period with eccentricity 0.14± 0.05 and M sin i = 1.27 MJUP. HD 217107 is also chromospherically inactive. The photometric metallicity is found to be [Fe/H]= +0.29 ± 0.1 dex. Given the relatively short orbital period, the absence of tidal spin up in HD 217107 provides a theoretical constraint on the upper limit of the companion mass of < 11 MJUP. Subject headings: planetary systems – stars: individual (HD 195019, HD 217107) Based on observations obtained at Lick Observatory, which is operated by the University of California, and on observations obtained at the W.M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. Department of Physics and Astronomy, San Francisco State University, San Francisco, CA, USA 94132 and at Department of Astronomy, University of California, Berkeley, CA USA 94720, [email protected] Anglo–Australian Observatory, PO Box 296, NSW 1710 Epping, Australia UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz, CA, 95064 Physics and Astronomy, Universityof Sussex, Falmer, Brighton, BN1, 9QJ, UK