2009/07/29 by Bunei Sato, Bun'ei Sato, Debra A. Fischer +10 · 18 citations
Physics and Astronomy · Social Sciences · #Astronomy and Astrophysical Research #Brown dwarf #Doppler effect #Eccentricity (behavior) #Educational Leadership and Practices #Minimum mass #Orbit (dynamics) #Orbital eccentricity #Orbital elements #Orbital period #Stellar, planetary, and galactic studies #Variation (astronomy) #astro-ph.EP
paper · pdf · doi:10.1088/0004-637x/703/1/671
published in The Astrophysical Journal 703(1), 671-674 (IOP Publishing) · 14 pages, 2 figures, accepted for publication in ApJ
arxiv created 2009/07/29 · openalex publication_date 2009/08/31 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 −1 , and an eccentricity of 0.084 ± 0.003. Adopting a stellar mass of 0.78 ± 0.05 M ☉ , 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.