Journal article · Preprint article
EPIC 219217635: A Doubly Eclipsing Quadruple System Containing an Evolved Binary
University of Szeged1
NASA Ames Research Center2
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark3
Aarhus University4
Massachusetts Institute of Technology5
Bishop's University6
Harvard-Smithsonian Center for Astrophysics7
Hereford Arizona Observatory8
Perth Exoplanet Survey Telescope9
National Space Institute, Technical University of Denmark10
California Institute of Technology11
...and 1 moreWe have discovered a doubly eclipsing, bound, quadruple star system in the field of K2 Campaign 7. EPIC 219217635 is a stellar image with Kp = 12.7 that contains an eclipsing binary (‘EB’) with PA = 3.59470 d and a second EB with PB = 0.61825 d. We have obtained followup radial-velocity (‘RV’) spectroscopy observations, adaptive optics imaging, as well as ground-based photometric observations.
From our analysis of all the observations, we derive good estimates for a number of the system parameters. We conclude that (1) both binaries are bound in a quadruple star system; (2) a linear trend to the RV curve of binary A is found over a 2-year interval, corresponding to an acceleration, Ý=0.0024±0.0007 cm s−2; (3) small irregular variations are seen in the eclipse-timing variations (‘ETVs’) detected over the same interval; (4) the orbital separation of the quadruple system is probably in the range of 8-25 AU; and (5) the orbital planes of the two binaries must be inclined with respect to each other by at least 25°.
In addition, we find that binary B is evolved, and the cooler and currently less massive star has transferred much of its envelope to the currently more massive star. We have also demonstrated that the system is sufficiently bright that the eclipses can be followed using small ground-based telescopes, and that this system may be profitably studied over the next decade when the outer orbit of the quadruple is expected to manifest itself in the ETV and/or RV curves.
Language: | English |
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Year: | 2018 |
Pages: | 5135-5152 |
ISSN: | 13652966 and 00358711 |
Types: | Journal article and Preprint article |
DOI: | 10.1093/mnras/sty1386 |
ORCIDs: | Tronsgaard, R , 0000-0003-1762-8235 , 0000-0002-0174-2466 and 0000-0001-5172-4859 |