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
Stass
中科院分区:
物理与天体物理2区
文献类型:
--
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

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我们报告了多目标阿帕奇点天文台径向系外行星大面积勘测(MARVERS)发现了HIP 67526恒星的候选棕矮星(BD)或极低质量恒星伴星(MARVILES-5b)。该天体的径向速度曲线包含31个历元,时间跨度为2.5年。用马尔科夫链蒙特卡罗方法进行的开普勒式拟合表明,这颗伴星的轨道周期为天数,偏心率为0.4375±0.0040,半振幅为m S−1。利用附加的高分辨光谱,我们发现这颗主星的有效温度T_(Jeff)=6004±34K,表面重力对数 _g(Cgs)=4.55±0.17,金属丰度[Fe/H]=+0.04±0.06。恒星质量和半径是由Torres等人的经验关系式确定的。产生1.10±0.09M☉和0.92±0.19R☉。奇迹-5b的最小质量为65.0±2.9MJup,表明它很可能是一颗BD或极低质量的恒星,从而占据了太阳型恒星伴星质量函数的相对稀少区域。到这个系统的距离是101±10pC,与依巴谷的天体测量值相距。无论是FastCam Lucy成像还是凯克自适应光学成像,在拍摄的高对比度图像中都没有检测到恒星第三级,这排除了任何质量超过0.2M☉、间隔大于40AU的恒星。
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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