A Possible Substellar Companion to the Intermediate-mass Giant HD 175679

Abstract

We report the discovery of a substellar companion around the intermediatemass giant HD 175679. Precise radial velocity data of the star from Xinglong Station and Okayama Astrophysical Observatory (OAO) revealed a Keplerian velocity variation with an orbital period of 1366.8 \pm 5.7 days, a semiamplitude of 380.2 \pm 3.2m s.1, and an eccentricity of 0.378 \pm 0.008. Adopting a stellar mass of 2.7 \pm 0.3 M\odot, we obtain the minimum mass of the HD 175679 b is 37.3 \pm 2.8 MJ, and the semimajor axis is 3.36 \pm 0.12 AU. This discovery is the second brown dwarf companion candidate from a joint planet-search program between China and Japan.

10 pages, 3 figures, RAA accepted

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Cited by in corpus (8)

• The Xinglong 2.16-m Telescope: Current Instruments and Scientific Projects
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• Substellar Companions to Seven Evolved Intermediate-Mass Stars
• Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and omega Serpentis
• The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements
• A Pair of Giant Planets around the Evolved Intermediate-Mass Star HD 47366: Multiple Circular Orbits or a Mutually Retrograde Configuration
• A Jupiter-mass planet around the K0 giant HD 208897
• Re-analysing the dynamical stability of the HD 47366 planetary system