A Planet Orbiting the Star ρ Coronae Borealis
Abstract
We report the discovery of near-sinusoidal radial velocity variations of the G0V star ρ CrB, with period 39.6 days and amplitude 67 m s-1. These variations are consistent with the existence of an orbital companion in a circular orbit. Adopting a mass of 1.0 Msolar for the primary, the companion has minimum mass about 1.1 Jupiter masses and orbital radius about 0.23 AU. Such an orbital radius is too large for tidal circularization of an initially eccentric orbit during the lifetime of the star, and hence we suggest that the low eccentricity is primordial, as would be expected for a planet formed in a dissipative circumstellar disk.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 1997
- DOI:
- 10.1086/310754
- arXiv:
- arXiv:astro-ph/9704248
- Bibcode:
- 1997ApJ...483L.111N
- Keywords:
-
- STARS: PLANETARY SYSTEMS;
- STARS: INDIVIDUAL CONSTELLATION NAME: RHO CORONAE BOREALIS;
- STARS: LOW-MASS;
- BROWN DWARFS;
- TECHNIQUES: RADIAL VELOCITIES;
- Stars: Planetary Systems;
- Stars: Low-Mass;
- Brown Dwarfs;
- stars: individual (ρ Coronae Borealis);
- Techniques: Radial Velocities;
- Astrophysics
- E-Print:
- 9 pages, LaTeX, accepted in Astrophys. J. Letters