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

Wang, Ji and David, Trevor J. and Hillenbrand, Lynne A. and Mawet, Dimitri and Albrecht, Simon and Liu, Zibo (2018) EPIC 203868608: A Low-mass Quadruple Star System in the Upper Scorpius OB Association. Astrophysical Journal, 865 (2). Art. No. 141. ISSN 1538-4357. doi:10.3847/1538-4357/aadee8.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wang, Ji0000-0002-4361-8885
David, Trevor J.0000-0001-6534-6246
Mawet, Dimitri0000-0002-8895-4735
Additional Information:© 2018. The American Astronomical Society. Received 2018 July 2; revised 2018 August 31; accepted 2018 September 2; published 2018 October 3. We thank the anonymous referee for his or her comments and suggestions that significantly improved the manuscript. We acknowledge Konstantin Batygin, Jim Fuller, and Fred Adams for discussions on tidal evolution and Kozai–Lidov perturbation in EPIC 203868608. We thank the PIs of KOA NIRC2 data, Christoph Baranec and Andrew Mann. S.A. acknowledges the support of the Danish Council for Independent Research, through DFF Sapere Aude Starting Grant No. 4181-00487B. Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant Agreement No. DNRF106). Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. T.J.D. acknowledges support from the JPL Exoplanetary Science Initiative. The data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Astronomy Department
Funding AgencyGrant Number
Danish Council for Independent Research4181-00487B
Danish National Research FoundationDNRF106
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:binaries: close; binaries: eclipsing; binaries: spectroscopic; stars: late-type; stars: low-mass; techniques: radial velocities
Issue or Number:2
Record Number:CaltechAUTHORS:20181221-105356785
Persistent URL:
Official Citation:Ji Wang et al 2018 ApJ 865 141
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91954
Deposited By: George Porter
Deposited On:21 Dec 2018 19:08
Last Modified:16 Nov 2021 03:45

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