Planetary Companions to HD 136118, HD 50554, and HD 106252
Abstract
Precise 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 Msolar yields a Keplerian companion with Msini=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 Msolar implies a companion mass Msini=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 Msolar implies Msini=6.96 MJ and semimajor axis of 2.42 AU. Based on observations obtained at Lick and Keck Observatories, which are operated by the University of California.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- May 2002
- DOI:
- 10.1086/341677
- Bibcode:
- 2002PASP..114..529F
- Keywords:
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- Stars: Low-Mass;
- Brown Dwarfs;
- planetary systems;
- stars: individual (HD 136118);
- stars: individual (HD 50554);
- stars: individual (HD 106252)