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A Substellar Companion in a 1.3 yr Nearly-circular Orbit of HD 16760

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arxiv 0907.5080 v1 pith:VWUIBBJS submitted 2009-07-29 astro-ph.EP

A Substellar Companion in a 1.3 yr Nearly-circular Orbit of HD 16760

Bunei Sato , Debra A. Fischer , Shigeru Ida , Hiroki Harakawa , Masashi Omiya , John A. Johnson , Geoffrey W. Marcy , Eri Toyota
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Yasunori Hori Howard Isaacson Andrew W. Howard Kathryn M.G. Peek
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keywords companionmasssubstellarorbitperiodadoptingaxisbrown-dwarf
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We report the detection of a substellar companion orbiting the G5 dwarf HD 16760 from the N2K sample. Precise Doppler measurements of the star from Subaru and Keck revealed a Keplerian velocity variation with a period of 466.47+-0.35 d, a semiamplitude of 407.71+-0.84 m/s, and an eccentricity of 0.084+-0.003. Adopting a stellar mass of 0.78+-0.05 M_Sun, we obtain a minimum mass for the companion of 13.13+-0.56 M_JUP, which is close to the planet/brown-dwarf transition, and the semimajor axis of 1.084+-0.023 AU. The nearly circular orbit despite the large mass and intermediate orbital period makes this companion unique among known substellar companions.

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