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LHS 1610A: A Nearby Mid-M Dwarf with a Companion That Is Likely a Brown Dwarf

2018; Institute of Physics; Volume: 155; Issue: 3 Linguagem: Inglês

10.3847/1538-3881/aaaa65

1538-3881

Jennifer G. Winters, Jonathan Irwin, Elisabeth Newton, David Charbonneau, David W. Latham, Eunkyu Han, Philip S. Muirhead, P. Berlind, M. Calkins, G. Esquerdo,

Astrophysics and Star Formation Studies

Abstract We present the spectroscopic orbit of LHS 1610A, a newly discovered single-lined spectroscopic binary with a trigonometric distance placing it at 9.9 ± 0.2 pc. We obtained spectra with the TRES instrument on the 1.5 m Tillinghast Reflector at the Fred Lawrence Whipple Observatory located on Mt. Hopkins in AZ. We demonstrate the use of the TiO molecular bands at 7065–7165 Å to measure radial velocities and achieve an average estimated velocity uncertainty of 28 m s −1 . We measure the orbital period to be 10.6 days and calculate a minimum mass of 44.8 ± 3.2 M Jup for the secondary, indicating that it is likely a brown dwarf. We place an upper limit to 3 σ of 2500 K on the effective temperature of the companion from infrared spectroscopic observations using IGRINS on the 4.3 m Discovery Channel Telescope. In addition, we present a new photometric rotation period of 84.3 days for the primary star using data from the MEarth-South Observatory, with which we show that the system does not eclipse.