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
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
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DOI：
10.1088/0004-6256/143/5/107
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发表时间：
2012-02
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通讯作者：
J. Wisniewski;J. Ge;J. Crepp;Nathan De Lee;J. Eastman;M. Esposito;S. Fleming;B. Gaudi;L. Ghezzi;J. G. González Hernández;B. Lee;K. Stassun;E. Agol;C. Prieto;R. Barnes;D. Bizyaev;P. Cargile;L. Chang;L. D. da Costa;G. F. Porto de Mello;B. Femenía;Leticia D. Ferreira;B. Gary;L. Hebb;J. Holtzman;Jian Liu;B. Ma;C. Mack;S. Mahadevan;M. Maia;D. Nguyen;R. Ogando;D. Oravetz;M. Paegert;K. Pan;J. Pepper;R. Rebolo;B. Santiago;D. Schneider;A. Shelden;A. Simmons;B. Tofflemire;X. Wan;Ji Wang;Bo Zhao
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作者：
J. Wisniewski;J. Ge;J. Crepp;Nathan De Lee;J. Eastman;M. Esposito;S. Fleming;B. Gaudi;L. Ghezzi;J. G. González Hernández;B. Lee;K. Stassun;E. Agol;C. Prieto;R. Barnes;D. Bizyaev;P. Cargile;L. Chang;L. D. da Costa;G. F. Porto de Mello;B. Femenía;Leticia D. Ferreira;B. Gary;L. Hebb;J. Holtzman;Jian Liu;B. Ma;C. Mack;S. Mahadevan;M. Maia;D. Nguyen;R. Ogando;D. Oravetz;M. Paegert;K. Pan;J. Pepper;R. Rebolo;B. Santiago;D. Schneider;A. Shelden;A. Simmons;B. Tofflemire;X. Wan;Ji Wang;Bo Zhao
TYC4110-01037-1有一颗低质量恒星伴星，它的小质量比和短轨道周期在拥有类似太阳的主恒星(Tef≲6000K)的双星系统中是不典型的。我们对TYC4110-01037-1的分析表明，它是一颗质量为1.07±0.08M☉、半径为0.99±0.18R☉的中等年龄(Gyr)类太阳恒星。我们分析了SDSS-III奇迹观测得到的32个径向速度(RV)测量值，以及在∼2年的时间里从3.6m望远镜上的SARG光谱仪上获得的6个支持RV的测量值。最佳的开普勒式轨道拟合参数为周期78.994±0.012天，偏心率0.1095±0.0023，半振幅4199±11m S−1。该系统的伴星与主星的质量比⩾为0.087±0.003，处于短周期伴星与类太阳(≲6000K)恒星的观测值的最低端。创建这样一个系统的一种可能的方法是，如果一个三组分的多重恒星在其寿命的星团扩散阶段分裂成短周期、低Q双星。通过单历元、高对比度的图像，系统中已经确定了一个候选的三级天体。如果这颗天体被证实正在移动，我们估计它将是一颗dm4恒星。我们在更大范围的努力下提出了这些结果，通过漫威调查将低质量恒星和棕矮星伴星的统计数据限制在FGK类型的恒星上。
TYC 4110-01037-1 has a low-mass stellar companion, whose small mass ratio and short orbital period are atypical among binary systems with solar-like (Teff ≲ 6000 K) primary stars. 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 M☉ and radius of 0.99 ± 0.18 R☉. We analyze 32 radial velocity (RV) measurements from the SDSS-III MARVELS survey as well as 6 supporting RV measurements from the SARG spectrograph on the 3.6 m Telescopio Nazionale Galileo 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−1. 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 comoving, 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.