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TIC 278956474: Two close binaries in one young quadruple system, identified by TESS

Hellier

TIC 278956474: Two close binaries in one young quadruple system, identified by TESS Thumbnail


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Abstract

We have identified a quadruple system with two close eclipsing binaries in TESS data. The object is unresolved in Gaia and appears as a single source at parallax 1.08~$\pm$0.01 mas. Both binaries have observable primary and secondary eclipses and were monitored throughout TESS Cycle 1 (sectors 1-13), falling within the TESS Continuous Viewing Zone. In one eclipsing binary (P = 5.488 d), the smaller star is completely occluded by the larger star during the secondary eclipse; in the other (P = 5.674 d) both eclipses are grazing. Using these data, spectroscopy, speckle photometry, SED analysis and evolutionary stellar tracks, we have constrained the masses and radii of the four stars in the two eclipsing binaries. The Li I EW indicates an age of 10-50 Myr and, with an outer period of $858^{+7}_{-5}$ days, our analysis indicates this is one of the most compact young 2+2 quadruple systems known.

Acceptance Date Jun 9, 2020
Publication Date Jul 23, 2020
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
DOI https://doi.org/10.3847/1538-3881/ab9d20
Keywords Close binary stars, Eclipsing binary stars, Young stellar objects, Multiple stars
Publisher URL http://dx.doi.org/10.3847/1538-3881/ab9d20

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