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  • VERY LOW MASS STELLAR AND S...
    Wisniewski, John P; Ge, Jian; CREPP, JUSTIN R; de Lee, Nathan; Eastman, Jason; Esposito, Massimiliano; Fleming, Scott W; Gaudi, B Scott; Ghezzi, Luan; HERNANDEZ, JONAY I GONZALEZ

    The Astronomical journal, 05/2012, Letnik: 143, Številka: 5
    Journal Article

    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 sub(eff) <, ~ 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 + or - 0.08 M sub(middot in a circle) and radius of 0.99 + or - 0.18 Re. 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 + or - 0.012 days, an eccentricity of 0.1095 + or - 0.0023, and a semi-amplitude of 4199 + or - 11ms super(-1). We determine the minimum companion mass (if sin i = 1) to be 97.7 + or - 5.8 M sub(Jup). The system's companion to host star mass ratio, > or =0.087 + or - 0.003, places it at the lowest end of observed values for short period stellar companions to solar-like (T sub(eff) <, ~ 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.