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Very low mass stellar and substellar companions to solar-like stars from MARVELS. V. A low eccentricity brown dwarf from the driest part of the desert, marvels-6b

By Nathan M. De Lee, Jian Ge, Justin R. Crepp, Jason Eastman, Massimiliano Esposito, B. Femenía Castellá, S.W. Fleming, B. S. Gaudi, Luan Ghezzi, Jonay I. González Hernández, Brian L. Lee, Keivan G. Stassun, J.P. Wisniewski, W.M. Wood-Vasey, Eric Agol, Carlos Allende Prieto, Rory Barnes, D. Bizyaev, Phillip A. Cargile, Liang Chang, Luiz N. da Costa, Gustavo Frederico Porto de Mello, Letícia D. Ferreira, Bruce L. Gary, Leslie Hebb, J.A. Holtzman, Jian Liu, Bo Ma, C. E. Mack, Suvrath Mahadevan, Marcio Antonio Geimba Maia, D.C. Nguyen, Audrey Oravetz, Daniel J. Oravetz, Martin Paegert, K. Pan, J. Pepper, E. Malanushenko, V. Malanushenko, Rafael Rebolo, Basilio Xavier Santiago, D.P. Schneider, Alaina C. Shelden Bradley, Xiaoke Wan, Ji Wang and Bo Zhao

Abstract

We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 ± 2.0 MJup to GSC 03546-01452 from the MARVELS radial velocity survey, which we designate as MARVELS-6b. For reasonable priors, our analysis gives a probability of 72% that MARVELS-6b has a mass below the hydrogen-burning limit of 0.072M , and thus it is a high-confidence BDcompanion. It has amoderately long orbital period of 47.8929+0.0063 −0.0062 days with a low eccentricity of 0.1442+0.0078 −0.0073, and a semi-amplitude of 1644+12 −13 m s−1. Moderate resolution spectroscopy of the host star has determined the following parameters: Teff = 5598 ± 63, log g = 4.44 ± 0.17, and [Fe/H] = +0.40 ± 0.09. Based upon these measurements, GSC 03546-01452 has a probable mass and radius of M∗ = 1.11±0.11M and R∗ = 1.06±0.23R with an age consistent with less than ∼6 Gyr at a distance of 219 ± 21 pc from the Sun. Although MARVELS-6b is not observed to transit, we cannot definitively rule out a transiting configuration based on our observations. There is a visual companion detected with Lucky Imaging at 7. 7 from the host star, but our analysis shows that it is not bound to this system. The minimum mass of MARVELS-6b exists at the minimum of the mass functions for both stars and planets, making this a rare object even compared to other BDs. It also exists in an underdense region in both period/eccentricity and metallicity/eccentricity space

Topics: Estrelas binarias, Brown dwarfs, Espectros estelares, Stars: individual (GSC 03546-01452), Anãs marrons, Massa estelar, Movimento estelar, Rotacao estelar, Dimensões estelares
Year: 2014
OAI identifier: oai:agregador.ibict.br.PC_UFRGS:oai:www.lume.ufrgs.br:10183/108158
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