Very Low Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS IV: A Candidate Brown Dwarf or Low-Mass Stellar Companion to HIP 67526
Jul 11, 2013Citations per year
0 Citations
Abstract: (arXiv)
We report the discovery of a candidate brown dwarf or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS). The radial velocity curve for this object contains 31 epochs spread over 2.5 years. Our Keplerian fit using a Markov Chain Monte Carlo approach, reveals that the companion has an orbital period of days, an eccentricity of and a semi-amplitude of m s. Using additional high-resolution spectroscopy, we find the host star has an effective temperature K, a surface gravity [cgs] and a metallicity [Fe/H] . The stellar mass and radius determined through the empirical relationship of Torres et al. (2010), yields 1.100.09 M_{\sun} and 0.920.19 R_{\sun}. The minimum mass of MARVELS-5b is , indicating that it is likely to be either a brown dwarf or a very low mass star, thus occupying a relatively sparsely-populated region of the mass function of companions to solar-type stars. The distance to this system is 10110 pc from the astrometric measurements of Hipparcos. No stellar tertiary is detected in the high-contrast images taken by either FastCam lucky imaging or Keck adaptive optics imaging, ruling out any star with mass greater than 0.2M_{\sun} at a separation larger than 40 AU.Note:
- 35 Pages, 10 Figures, 4 Tables, Accepted for Publication in The Astronomical Journal
References(107)
Figures(10)