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Title:
EPIC 203868608: A Low-mass Quadruple Star System in the Upper Scorpius OB Association
Authors:
Wang, Ji; David, Trevor J.; Hillenbrand, Lynne A.; Mawet, Dimitri; Albrecht, Simon; Liu, Zibo
Affiliation:
AA(Department of Astronomy, California Institute of Technology, MC 249-17, 1200 E. California Boulevard, Pasadena, CA 91106, USA ; Department of Astronomy, The Ohio State University, 100 W 18th Avenue, Columbus, OH 43210, USA; 0000-0002-4361-8885), AB(Department of Astronomy, California Institute of Technology, MC 249-17, 1200 E. California Boulevard, Pasadena, CA 91106, USA ; Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA 0000-0001-6534-6246), AC(Department of Astronomy, California Institute of Technology, MC 249-17, 1200 E. California Boulevard, Pasadena, CA 91106, USA), AD(Department of Astronomy, California Institute of Technology, MC 249-17, 1200 E. California Boulevard, Pasadena, CA 91106, USA 0000-0002-8895-4735), AE(Stellar Astrophysics Centre, Department of Physics and Astronomy Aarhus University, Ny Munkegade 120, DK-8000, Aarhus C, Denmark), AF(Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093, People's Republic of China)
Publication:
The Astrophysical Journal, Volume 865, Issue 2, article id. 141, 12 pp. (2018). (ApJ Homepage)
Publication Date:
10/2018
Origin:
IOP
Astronomy Keywords:
binaries: close, binaries: eclipsing, binaries: spectroscopic, stars: late-type, stars: low-mass, techniques: radial velocities
DOI:
10.3847/1538-4357/aadee8
Bibliographic Code:
2018ApJ...865..141W

Abstract

Young multiple star systems provide excellent testing grounds for theories of star formation and evolution. EPIC 203868608 was previously studied as a triple star system in the Upper Scorpius OB association, but the followup Keck NIRC2/HIRES/NIRSPAO observations reported here reveal its quadruple nature. We find that the system consists of a double-lined spectroscopic binary (SB2) Aab (M5+M5) and an eclipsing binary (EB) Bab with a total mass that is lower than that of the SB2. Furthermore, we measure the obliquity of the EB using the Doppler tomography technique during the primary eclipse. EPIC 203868608 Bab is likely on an inclined orbit with a projected obliquity of -{57}-36+40 degrees. The inclined orbit is used to constrain the tidal quality factor for low-mass stars and the evolution of the quadruple system. The analytic framework to infer obliquity that has been developed in this paper can be applied to other EB systems as well as transiting planets.
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