Winters, Jennifer G.Irwin, JonathanNewton, Elisabeth R.Charbonneau, DavidLatham, David W.Han, EunkyuMuirhead, Philip S.Berlind, PerryCalkins, Michael L.Esquerdo, Gilbert2018-07-192018-07-192018-03-01Jennifer G Winters, Jonathan Irwin, Elisabeth R Newton, David Charbonneau, David W Latham, Eunkyu Han, Philip S Muirhead, Perry Berlind, Michael L Calkins, Gil Esquerdo. 2018. "LHS 1610A: A Nearby Mid-M Dwarf with a Companion That Is Likely a Brown Dwarf." ASTRONOMICAL JOURNAL, Volume 155, Issue 3, pp. ? - ? (7).0004-62561538-3881https://hdl.handle.net/2144/30003We 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 3σ 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.7 pages© 2018 American Astronomical SocietyLHS 1610APhysical sciencesAstronomy & astrophysicsBinaries: spectroscopicBrown dwarfsStars: low-massStars: rotationLow mass starsProper motion starsSolar type starsRadial velocitiesSpectroscopic binariesSubstellar companionsStellar multiplicitySAMPLEAstronomical and space sciencesArticle10.3847/1538-3881/aaaa650000-0002-0638-8822 (Muirhead, Philip S)