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Astrophysics > Solar and Stellar Astrophysics

arXiv:1804.11272 (astro-ph)
[Submitted on 30 Apr 2018 (v1), last revised 26 Aug 2018 (this version, v4)]

Title:A study of light travel time effect in short-period MOA eclipsing binaries via eclipse timing

Authors:M. C. A. Li, N. J. Rattenbury, I. A. Bond, T. Sumi, D. P. Bennett, N. Koshimoto, F. Abe, Y. Asakura, R. Barry, A. Bhattacharya, M. Donachie, P. Evans, A. Fukui, Y. Hirao, Y. Itow, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, K. Ohnishi, To. Saito, A. Sharan, D. J. Sullivan, D. Suzuki, P. J. Tristram, A. Yonehara
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Abstract:A sample of 542 eclipsing binaries (EBs) with periods shorter than 2 d were selected from the Microlensing Observations in Astrophysics (MOA) EB catalogue (Li et al. 2017) for eclipse-time variation analysis. For this sample we were able to obtain the time series from MOA-II that span 9.5yr. We discovered 91 EBs, out of the 542 EBs, with detected light-travel-time effect signals suggesting the presence of tertiary companions of orbiting periods from 250 d-28 yr. The frequency of EBs with tertiary companions in our sample increases as the period decreases and reaches a value of 0.65 for contact binaries with periods shorter than 0.3 d. If only the contact binaries of periods < 0.26d are considered, the frequency even goes to the unit. Our results suggest that contact binaries with periods close to the 0.22-d contact binary limit are commonly accompanied by relatively close tertiary companions.
Comments: 22 pages, 17 figures, MNRAS accepted
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1804.11272 [astro-ph.SR]
  (or arXiv:1804.11272v4 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1804.11272
Journal reference: MNRAS, Volume 480, Issue 4, 11 November 2018, Pages 4557-4577
Related DOI: https://doi.org/10.1093/mnras/sty2104

Submission history

From: Man Cheung Alex Li [view email]
[v1] Mon, 30 Apr 2018 15:21:41 UTC (11,441 KB)
[v2] Tue, 1 May 2018 14:56:36 UTC (11,441 KB)
[v3] Tue, 31 Jul 2018 16:27:34 UTC (9,855 KB)
[v4] Sun, 26 Aug 2018 12:27:09 UTC (9,856 KB)
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