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

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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

Cite this

Borkovits, T., Rappaport, S., Kaye, T., Isaacson, H., Vanderburg, A., Howard, A. W., ... Endl, M. (2019). Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662. Monthly Notices of the Royal Astronomical Society, 483(2), 1934–1951.