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  Searching for orbital decay in a heartbeat star system KIC 3766353

Ou, J.-W., Yu, C., Jiang, C., Yang, M., & Niu, H. (2021). Searching for orbital decay in a heartbeat star system KIC 3766353. Monthly Notices of the Royal Astronomical Society, 508(3), 3967-3974. doi:10.1093/mnras/stab2805.

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Ou, J.-W., Author
Yu, C., Author
Jiang, Chen1, Author           
Yang, M., Author
Niu, H., Author
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: methods: data analysis, planet–star interactions, stars: individual: KIC 3766353 (KOI-6359)
 Abstract: Theory suggests that the orbits of a large fraction of binary systems, including planet-star binary systems, shrink by a few orders of magnitude after formation. But so far, only one hot Jupiter with tidally driven orbital decay has been found by transit timing variations. We propose to search for orbital decay companions in heartbeat star systems because the orbital angular momentum is effectively transferred to the host star, causing tidal dissipation. KIC 3766353 is one of the heartbeat stars with tidally excited oscillations. We acquired the primary and the secondary eclipse time variations from the Kepler photometric light curves. Timing analysis shows that KIC 3766353 is a hierarchical triple system with a hidden third body and a red dwarf (mass 0.35 M, radius 0.34 R) in its inner orbit. The minimum mass of the third body is ~0.26 M, and the distance from the inner orbital is ~111.4 R. The period decay rate of the red dwarf is approximately 358 ms yr-1. The combined effects of the light-traveltime and the orbital decay lead to the observed timing variations. Future monitoring with long-time baseline observations is required to delve into the contributions of these two effects.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 508 (3) Sequence Number: - Start / End Page: 3967 - 3974 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150