文章基本信息

标题：Spectroscopic Orbits of 11 Nearby, Mid-to-late M-dwarf Binaries
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作者：Jennifer G.Winters ; Jonathan M.Irwin ; David Charbonneau 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：6
页码：4054-4067
DOI：10.3847/1538-3881/ab8d31
语种：English
出版社：American Institute of Physics
摘要：We present the spectroscopic orbits of 11 nearby, mid-to-late M dwarf binary systems in a variety of configurations: 2 single-lined binaries (SB1s), 7 double-lined binaries (SB2s), 1 double-lined triple (ST2), and 1 triple-lined triple (ST3).Eight of these orbits are the first published for these systems, while five are newly identified multiples.We obtained multi-epoch, high-resolution spectra with the TRES instrument on the 1.5 m Tillinghast Reflector at the Fred Lawrence Whipple Observatory located on Mt.Hopkins in AZ.Using the TiO molecular bands at 7065−7165 Å, we calculated radial velocities for these systems, from which we derived their orbits.We find LHS 1817 to have in a 7 hr period a companion that is likely a white dwarf, due to the ellipsoidal modulation we see in our MEarth-North light-curve data.We find G 123-45 and LTT 11586 to host companions with minimum masses of 41 MJup and 44 MJup with orbital periods of 35 and 15 days, respectively.We find 2MA 0930+0227 to have a rapidly rotating stellar companion in a 917 day orbital period.GJ 268, GJ 1029, LP 734-34, GJ 1182, G 258-17, and LTT 7077are SB2s with stellar companions with orbital periods of 10, 96, 34, 154, 5, and 84 days; LP 655-43 is an ST3 with one companion in an 18 day orbital period and an outer component in a longer undetermined period.In addition, we present radial velocities for both components of L 870-44AB and for the outer components of LTT 11586 and LP 655-43.
关键词：Spectroscopic binary stars;Solar neighborhood;M dwarf stars;White dwarf stars;Orbital elements;Substellar companion stars