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

We report the discovery of a candidate brown dwarf (BD) or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object Apache point observatory Radial Velocity Exoplanet Large-area Survey (MARVELS). The radial velocity curve for this object contains 31 epochs spread over 2.5 yr. Our Keplerian fit, using a Markov Chain Monte Carlo approach, reveals that the companion has an orbital period of 90.2695(-0.0187)(+0.0188) days, an eccentricity of 0.4375 +/- 0.0040, and a semi-amplitude of 2948.14(-16.55)(+16.65) m s(-1). Using additional high-resolution spectroscopy, we find the host star has an effective temperature T-eff = 6004 +/- 34 K, a surface gravity log g (cgs) = 4.55 +/- 0.17, and a metallicity [Fe/H] = +0.04 +/- 0.06. The stellar mass and radius determined through the empirical relationship of Torres et al. yields 1.10 +/- 0.09 M-circle dot and 0.92 +/- 0.19 R-circle dot. The minimum mass of MARVELS-5b is 65.0 +/- 2.9 M-Jup, indicating that it is likely to be either a BD 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 101 +/- 10 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 0.2 M-circle dot at a separation larger than 40 AU.