Abstract
ABSTRACTPrecise Doppler observations at Lick Observatory have revealed a substellar companion orbiting the F9 V star HD 136118 with an orbital period P = 1209 ± 24 days, velocity semiamplitude K = 212 ± 6 m s−1, and eccentricity of 0.37 ± 0.025. The assumed stellar mass of 1.24 M⊙ yields a Keplerian companion with Msin i = 11.9 MJ and semimajor axis of 2.3 AU. We also confirm the orbital solutions for two previously announced planets, one orbiting the F8 V star HD 50554 and one orbiting the G0 V star HD 106252. Our orbital solution for HD 50554 yields P = 1254 ± 34 days, K = 78.5 ± 6.7 m s−1, and e = 0.51 ± 0.06. The assumed stellar mass of 1.065 M⊙ implies a companion mass Msin i = 3.7 MJ and semimajor axis of 2.2 AU. For HD 106252, we find P = 1503.3 ± 62 days, K = 150.9 ± 25 m s−1, and eccentricity e = 0.57 ± 0.11. The assumed stellar mass of 0.96 M⊙ implies Msin i = 6.96 MJ and semimajor axis of 2.42 AU.
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