LHS 1610A: a nearby mid-M dwarf with a companion that is likely a brown dwarf
Winters, Jennifer G.
Newton, Elisabeth R.
Latham, David W.
Muirhead, Philip S.
Calkins, Michael L.
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Citation (published version)Jennifer 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).
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 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.
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