EPIC 203868608: A Low-mass Quadruple Star System in the Upper Scorpius OB Association

被引：9
|
作者：
Wang, Ji [1 ,2 ]
David, Trevor J. [1 ,3 ]
Hillenbrand, Lynne A. [1 ]
Mawet, Dimitri [1 ]
Albrecht, Simon [4 ]
Liu, Zibo [5 ,6 ]
机构：
[1] CALTECH, Dept Astron, MC 249-17,1200 E Calif Blvd, Pasadena, CA 91106 USA
[2] Ohio State Univ, Dept Astron, 100 W 18th Ave, Columbus, OH 43210 USA
[3] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA
[4] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
[5] Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
[6] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2018年 / 865卷 / 02期
基金：
美国国家航空航天局; 新加坡国家研究基金会;
关键词：
binaries: close; binaries: eclipsing; binaries: spectroscopic; stars: late-type; stars: low-mass; techniques: radial velocities; ECLIPSING BINARY; HIERARCHICAL TRIPLE; PLANETARY ORBITS; EVOLUTION; MULTIPLICITY; MISSION; ORIGIN; PERTURBATIONS; SATELLITES; TELESCOPE;
D O I：
10.3847/1538-4357/aadee8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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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页数：12
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