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Very low mass stellar and substellar companions to solar-like stars from MARVELS. IV. A candidate bronw dwarf or low-mass stellar companion HIP 67526

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Very low mass stellar and substellar companions to solar-like stars from MARVELS. IV. A candidate bronw dwarf or low-mass stellar companion HIP 67526

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Título Very low mass stellar and substellar companions to solar-like stars from MARVELS. IV. A candidate bronw dwarf or low-mass stellar companion HIP 67526
Autor Jiang, Peng
Ge, Jian
Cargile, Phillip A.
Crepp, Justin R.
De Lee, Nathan M.
Mello, Gustavo Frederico Porto de
Esposito, Massimiliano
Ferreira, Letícia D.
Femenía Castellá, B.
Fleming, S.W.
Gaudi, B. S.
Ghezzi, Luan
González Hernández, Jonay I.
Hebb, Leslie
Lee, Brian L.
Ma, Bo
Stassun, Keivan G.
Wang, Ji
Wisniewski, J.P.
Agol, Eric
Bizyaev, D.
Brewington, Howard J.
Chang, Liang
Costa, Luiz N. da
Eastman, Jason
Ebelke, Garrett L.
Gary, Bruce L.
Kane, Stephen R.
Li, Rui
Liu, Jian
Mahadevan, Suvrath
Maia, Marcio Antonio Geimba
Malanushenko, V.
Malanushenko, E.
Muna, Demitri
Nguyen, D.C.
Ogando, Ricardo L.C.
Oravetz, Audrey
Oravetz, Daniel J.
Pan, K.
Pepper, J.
Paegert, Martin
Allende Prieto, Carlos
Rebolo, Rafael
Santiago, Basilio Xavier
Schneider, D.P.
Bradley, Alaina C. Shelden
Sivarani, Thirupathi
Snedden, S.A.
Van Eyken, Julian C.
Wan, Xiaoke
Weaver, Benjamin A.
Zhao, Bo
Abstract 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.OurKeplerian 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±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 Teff = 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±0.09M and 0.92±0.19R . The minimummass ofMARVELS- 5b is 65.0±2.9MJup, 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 at a separation larger than 40 AU.
Contido em The Astronomical journal. Vol. 146, no. 3 (Sep. 2013), 65, 11 p.
Assunto Anãs marrons
Estrelas binarias
Massa estelar
[en] Binaries: spectroscopic
[en] Brown dwarfs
[en] Stars: individual (HIP 67526)
[en] Stars: low-mass
[en] Techniques: radial velocities
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108178
Arquivos Descrição Formato
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