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- W2891092681 abstract "Young multiple star systems provide excellent testing grounds for theories of star formation and evolution. EPIC 203868608 was previously studied~citep{David2016} as a triple star system in the Upper Scorpius OB association, but the follow-up 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 $-57^{+40}_{-36}$ 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." @default.
- W2891092681 created "2018-09-27" @default.
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- W2891092681 date "2018-10-03" @default.
- W2891092681 modified "2023-10-03" @default.
- W2891092681 title "EPIC 203868608: A Low-mass Quadruple Star System in the Upper Scorpius OB Association" @default.
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- W2891092681 doi "https://doi.org/10.3847/1538-4357/aadee8" @default.
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