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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Wisniewski-2012-VERY LOW MASS STELLA.pdf
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Author(s)
Stassun, Keivan
Date Issued
March 2012
Journal
The Astronomical Journal
Publisher
IOP Publishing
Citation
Wisniewski, John P., Jian Ge, Justin R. Crepp, Nathan De Lee, Jason Eastman, Massimiliano Esposito, Scott W. Fleming, et al. “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.” The Astronomical Journal 143, no. 5 (March 27, 2012): 107. © 2012 The American Astronomical Society
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Final published version
Abstract
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 (T [subscript eff] [< over ~] 6000 K) primary stars. Our analysis of TYC 4110-01037-1 reveals it to be a moderately aged ([< over ~] Gyr) solar-like star having a mass of 1.07 ± 0.08 M [subscript ☉] and radius of 0.99 ± 0.18 R [subscript ☉]. 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[superscript –1]. We determine the minimum companion mass (if sin i = 1) to be 97.7 ± 5.8 M [subscript Jup]. 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 (T [subscript eff] [< over ~] 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1088/0004-6256/143/5/107
