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arXiv 1202.4964astro-ph.SR
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来自MARVELS的类太阳恒星的极低质量恒星和亚恒星伴星I：在79天轨道上的TYC 4110-01037-1的低质量比恒星伴星

Very Low-Mass Stellar and Substellar Companions to Solar-Like Stars from MARVELS I: A Low Mass Ratio Stellar Companion to TYC 4110-01037-1 in a 79-day Orbit

John P. Wisniewski, Jian Ge, Justin R. Crepp, Nathan De Lee, Jason Eastman, Massimiliano Esposito, Scott W. Fleming, B. Scott Gaudi, Luan Ghezzi, Jonay I. Gonza… 展开作者

John P. Wisniewski, Jian Ge, Justin R. Crepp, Nathan De Lee, Jason Eastman, Massimiliano Esposito, Scott W. Fleming, B. Scott Gaudi, Luan Ghezzi, Jonay I. Gonzalez Hernandez, Brian L. Lee, Keivan G. Stassun, Eric Agol, Carlos Allende Prieto, Rory Barnes, Dmitry Bizyaev, Phillip Cargile, Liang Chang, Luiz N. Da Costa, G. F. Porto De Mello, Bruno Femenia, Leticia D. Ferreira, Bruce Gary, Leslie Hebb, Jon Holtzman, Jian Liu, Bo Ma, Claude E. Mack, Suvrath Mahadevan, Marcio A. G. Maia, Duy Cuong Nguyen, Ricardo L. C. Ogando, Daniel J. Oravetz, Martin Paegert, Kaike Pan, Joshua Pepper, Rafael Rebolo, Basilio Santiago, Donald P. Schneider, Alaina C Shelden, Audrey Simmons, Benjamin M. Tofflemire, Xiaoke Wan, Ji Wang, Bo Zhao

备注：
22 pages; accepted in AJ
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摘要：

TYC 4110-01037-1有一个低质量伴星，其质量比小，轨道周期短，在类太阳双星系统中是不典型的（Teff < 6000 K）。我们对TYC 4110-01037-1的分析显示，它是一颗中等年龄（<5 Gyr）的类太阳恒星，质量为1.07 +/- 0.08 MSun，半径为0.99 +/- 0.18 RSun。我们分析了32径向速度测量SDSS-III MARVELS调查以及6个支持径向速度测量从SARG光谱仪上的3.6米TNG望远镜在一段时间内获得的~2年。开普勒轨道的最佳拟合参数是周期为78.994 +/- 0.012天，离心率为0.1095 +/- 0.0023，半振幅为4199 +/- 11 m/s。我们确定伴星的最小质量（如果sin i = 1）为97.7 +/- 5.8 MJup。该系统的伴星与主星质量比>0.087 +/- 0.003，是短周期伴星与类太阳恒星（Teff ~< 6000 K）质量比的最低值。一个可能的方法是，如果一个三分量恒星多重体在其生命周期的星团扩散阶段分裂成一个短周期的低q双星。通过单历元高对比度图像，在该系统中确定了一个候选第三纪体。如果这个物体被证实是共同运动的，我们估计它将是一颗dM 4恒星。我们提出了这些结果的背景下，我们的大规模的努力，以限制统计的低质量恒星和褐矮星同伴FGK型恒星通过MARVELS调查。

英文摘要：

TYC 4110-01037-1 has a low-mass stellar companion, whose small mass ratio and short orbital period are atypical amongst solar-like (Teff ~< 6000 K) binary systems. Our analysis of TYC 4110-01037-1 reveals it to be a moderately aged (~<5 Gyr) solar-like star having a mass of 1.07 +/- 0.08 MSun and radius of 0.99 +/- 0.18 RSun. We analyze 32 radial velocity measurements from the SDSS-III MARVELS survey as well as 6 supporting radial velocity measurements from the SARG spectrograph on the 3.6m TNG telescope obtained over a period of ~2 years. The best Keplerian orbital fit parameters were found to have a period of 78.994 +/- 0.012 days, an eccentricity of 0.1095 +/- 0.0023, and a semi-amplitude of 4199 +/- 11 m/s. We determine the minimum companion mass (if sin i = 1) to be 97.7 +/- 5.8 MJup. The system's companion to host star mass ratio, >0.087 +/- 0.003, places it at the lowest end of observed values for short period stellar companions to solar-like (Teff ~< 6000 K) stars. One possible way to create such a system would be if a triple-component stellar multiple broke up into a short period, low q binary during the cluster dispersal phase of its lifetime. A candidate tertiary body has been identified in the system via single-epoch, high contrast imagery. If this object is confirmed to be co-moving, we estimate it would be a dM4 star. We present these results in the context of our larger-scale effort to constrain the statistics of low mass stellar and brown dwarf companions to FGK-type stars via the MARVELS survey.

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