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26 April 2024

» arxiv » 1307.3308

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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
Peng Jiang ; Jian Ge ; Phillip Cargile ; Justin R. Crepp ; Nathan De Lee ; Gustavo F. Porto de Mello ; Massimiliano Esposito ; Letícia D. Ferreira ; Bruno Femenia ; Scott W. Fleming ; B. Scott Gaudi ; Luan Ghezzi ; Jonay I. González Hernández ; Leslie Hebb ; Brian L. Lee ; Bo Ma ; Keivan G. Stassun ; Ji Wang ; John P. Wisniewski ; Eric Agol ; Dmitry Bizyaev ; Howard Brewington ; Liang Chang ; Luiz Nicolaci da Costa ; Jason D. Eastman ; Garrett Ebelke ; Bruce Gary ; Stephen R. Kane ; Rui Li ; Jian Liu ; Suvrath Mahadevan ; Marcio A. G. Maia ; Viktor Malanushenko ; Elena Malanushenko ; Demitri Muna ; Duy Cuong Nguyen ; Ricardo L. C. Ogando ; Audrey Oravetz ; Daniel Oravetz ; Kaike Pan ; Joshua Pepper ; Martin Paegert ; Carlos Allende Prieto ; Rafael Rebolo ; Basilio X. Santiago ; Donald P. Schneider ; Alaina C. Shelden Bradley ; Thirupathi Sivarani ; Stephanie Snedden ; J. C. van Eyken ; Xiaoke Wan ; Benjamin A. Weaver ; Bo Zhao ;
Date:	12 Jul 2013
Abstract:	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 $90.2695^{+0.0188}_{-0.0187}$ days, an eccentricity of $0.4375 pm 0.0040$ and a semi-amplitude of $2948.14^{+16.65}_{-16.55}$ m s$^{-1}$. Using additional high-resolution spectroscopy, we find the host star has an effective temperature $T_{ m{eff}}=6004 pm 34$ K, a surface gravity $log g$ [cgs] $=4.55 pm 0.17$ and a metallicity [Fe/H] $=+0.04 pm 0.06$. The stellar mass and radius determined through the empirical relationship of Torres et al. (2010), yields 1.10$pm$0.09 $M_{sun}$ and 0.92$pm$0.19 $R_{sun}$. The minimum mass of MARVELS-5b is $65.0 pm 2.9 M_{Jup}$, 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 101$pm$10 pc from the astrometric measurements of Hipparcos. No stellar tertiary is detected in the high-contrast images taken by either FastCam lucky imaging or Keck adaptive optics imaging, ruling out any star with mass greater than 0.2$M_{sun}$ at a separation larger than 40 AU.
Source:	arXiv, 1307.3308
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