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
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
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奇迹中的类太阳恒星的质量非常低的恒星和亚恒星伴星。
DOI:
10.1088/0004-6256/146/3/65
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发表时间:
2013-07
影响因子:
5.3
通讯作者:
Stass
中科院分区:
文献类型:
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作者:
Jiang Peng;Ge Jian;Cargile Phillip;Crepp Justin R.;De Lee Nathan;Porto de Mello Gustavo F.;Esposito Massimiliano;Ferreira Leticia D.;Femenia Bruno;Fleming Scott W.;Gaudi B. Scott;Ghezzi Luan;Gonzalez Hern;ez Jonay I.;Hebb Leslie;Lee Brian L.;Ma Bo;Stass
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 days, an eccentricity of 0.4375 ± 0.0040, and a semi-amplitude of 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 ± 0.09 M☉ and 0.92 ± 0.19 R☉. The minimum mass of MARVELS-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.
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DOI:
10.1088/0067-0049/197/2/19
发表时间:
2011-08
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
J. Kirkpatrick;M. Cushing;C. Gelino;R. Griffith;M. Skrutskie;K. Marsh;E. Wright;A. Mainzer;
通讯作者:
J. Kirkpatrick;M. Cushing;C. Gelino;R. Griffith;M. Skrutskie;K. Marsh;E. Wright;A. Mainzer;
DOI:
10.1086/338768
发表时间:
2001-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Vogt;R. P. Butler;G. Marcy;G. Marcy;D. Fischer;D. Fischer;D. Pourbaix;K. Apps;G. Laughlin
通讯作者:
S. Vogt;R. P. Butler;G. Marcy;G. Marcy;D. Fischer;D. Fischer;D. Pourbaix;K. Apps;G. Laughlin
DOI:
10.1086/432594
发表时间:
2005-10
期刊:
The Astrophysical Journal
影响因子:
--
作者:
P. Gregory
通讯作者:
P. Gregory
DOI:
10.1088/0004-637x/738/2/132
发表时间:
2011-05
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Ji Wang;J. Ge;P. Jiang;Bo Zhao
通讯作者:
Ji Wang;J. Ge;P. Jiang;Bo Zhao
DOI:
10.1086/311011
发表时间:
1997-07
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
C. Tinney;X. Delfosse;T. Forveille
通讯作者:
C. Tinney;X. Delfosse;T. Forveille