Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662

T. Borkovits*, S. Rappaport, T. Kaye, H. Isaacson, A. Vanderburg, A. W. Howard, M. H. Kristiansen, M. R. Omohundro, H. M. Schwengeler, I. A. Terentev, A. Shporer, H. Relles, S. Villanueva, T. G. Tan, K. D. Colón, J. Blex, M. Haas, W. Cochran, M. Endl

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Using Campaign 15 data from the K2 mission, we have discovered a triply-eclipsing triple star system: EPIC 249432662. The inner eclipsing binary system has a period of 8.23 days, with shallow ∼3% eclipses. During the entire 80-day campaign, there is also a single eclipse event of a third-body in the system that reaches a depth of nearly 50% and has a total duration of 1.7 days, 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 lightcurve, 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 days. 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-day eclipses. A combined photo-spectro-dynamical analysis then leads to the determination of many of the system parameters. The 8-day 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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Pages (from-to)1934–1951
Publication statusPublished - 2019

Bibliographical note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s)Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


  • Binaries: close
  • Binaries: eclipsing
  • Stars: individual: EPIC 249432662

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