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Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662

Borkovits, T. and Rappaport, S. and Kaye, T. and Isaacson, H. and Vanderburg, A. and Howard, A. W. and Kristiansen, M. H. and Omohundro, M. R. and Schwengeler, H. M. and Terentev, I. A. and Shporer, A. and Relles, H. and Villanueva, S., Jr. and Tan, T. G. and Colón, K. D. and Blex, J. and Haas, M. and Cochran, W. and Endl, M. (2019) Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662. Monthly Notices of the Royal Astronomical Society, 483 (2). pp. 1934-1951. ISSN 0035-8711. https://resolver.caltech.edu/CaltechAUTHORS:20190415-153046599

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Abstract

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 d, with shallow ∼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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/sty3157DOIArticle
ORCID:
AuthorORCID
Borkovits, T.0000-0002-8806-496X
Rappaport, S.0000-0003-3182-5569
Isaacson, H.0000-0002-0531-1073
Vanderburg, A.0000-0001-7246-5438
Howard, A. W.0000-0001-8638-0320
Shporer, A.0000-0002-1836-3120
Villanueva, S., Jr.0000-0001-6213-8804
Colón, K. D.0000-0001-8020-7121
Cochran, W.0000-0001-9662-3496
Endl, M.0000-0002-7714-6310
Additional Information:© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2018 November 20. Received 2018 November 20; in original form 2018 September 3. Published: 22 November 2018. T. B. acknowledges the financial support of the Hungarian National Research, Development and Innovation Office – NKFIH Grant OTKA K-113117. We thank Bruce Gary for reducing the data from the JBO observations. M. H. K., M. R. O., H. M. S., and I. T. acknowledge Allan R. Schmitt for making his light-curve examining software lctools freely available. We are thankful for the fruitful discussions with Sz. Csizmadia (DLR, Berlin) and I. B. Bíró (Baja Astronomical Observatory, Hungary). W. D. C. and M. E. acknowledge support from NASA grants NNX16AJ11G and 80NSSC18K0447 to The University of Texas at Austin. This work was performed in part under contract with the California Institute of Technology/Jet Propulsion Laboratory funded by NASA through the Sagan Fellowship Program executed by the NASA Exoplanet Science Institute. This paper includes data collected by the K2 mission. Funding for the K2 mission is provided by the NASA Science Mission directorate. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. The authors wish to extend special thanks to those of Hawai’ian ancestry on whose sacred mountain of Maunakea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
Hungarian Scientific Research Fund (OTKA)OTKA K-113117
NASANNX16AJ11G
NASA80NSSC18K0447
NASA/JPL/CaltechUNSPECIFIED
NASA Sagan Fellowship ProgramUNSPECIFIED
NASANAS5-26555
NASANNX09AF08G
Subject Keywords:binaries: close – binaries: eclipsing – stars: individual: EPIC 249432662
Issue or Number:2
Record Number:CaltechAUTHORS:20190415-153046599
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190415-153046599
Official Citation: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 Jr, T G Tan, K D Colón, J Blex, M Haas, W Cochran, M Endl, Photodynamical analysis of the triply eclipsing hierarchical triple system EPIC 249432662, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 2, February 2019, Pages 1934–1951, https://doi.org/10.1093/mnras/sty3157
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94720
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Apr 2019 20:13
Last Modified:09 Mar 2020 13:19

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