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Borkovits, T.; Rappaport, S.; Kaye, T.; Isaacson, H; Vanderburg, A; Howard, A. W.; Kristiansen, M. H.; Omohundro, M. R.; Schwengeler, H. M.; Terentev, I. A.; Shporer, A; Relles, H.; Jr, S Villanueva; Tan, T. G.; Colon, K D.; Blex, J.; Haas, M.; Cochran, W.; Endl, M.
Monthly Notices of the Royal Astronomical Society, 02/2019, Volume: 483, Issue: 2Journal Article
Using Campaign 15 data from theK2mission, we have discovered a triply eclipsing triple star system: EPIC 249432662. The inner eclipsing binary system has a period of 8.23 d, withshallow∼3 per cent eclipses. During the entire 80-d campaign, there is also a single eclipse event of a third body in the system that reaches a depth of nearly 50 per cent and has a total duration of 1.7 d, longer than for any previously known third-body eclipse involving unevolved stars. The binary eclipses exhibit clear eclipse timing variations. A combination of photodynamical modeling of the light curve, as well as seven follow-up radial velocity measurements, has led to a prediction of the subsequent eclipses of the third star with a period of 188 d. A campaign of follow-up ground-based photometry was able to capture the subsequent pair of third-body events as well as two further 8-d eclipses. A combined photo-spectro-dynamical analysis then leads to the determination of many of the system parameters. The 8-d binary consists of a pair of M stars, while most of the system light is from a K star around which the pair of M stars orbits.
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