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  Rapid Eccentricity Oscillations and the Mergers of Compact Objects in Hierarchical Triples

Antognini, J. M., Shappee, B. J., Thompson, T. A., & Amaro-Seoane, P. (2014). Rapid Eccentricity Oscillations and the Mergers of Compact Objects in Hierarchical Triples. Monthly Notices of the Royal Astronomical Society, 439, 1079-1091. doi:10.1093/mnras/stu039.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0070-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0071-1
Genre: Journal Article

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 Creators:
Antognini, Joe M., Author
Shappee, Benjamin J., Author
Thompson, Todd A., Author
Amaro-Seoane, Pau1, Author              
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1933290              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
 Abstract: Kozai-Lidov (KL) oscillations can accelerate compact object mergers via gravitational wave (GW) radiation by driving the inner binaries of hierarchical triples to high eccentricities. We perform direct three-body integrations of high mass ratio compact object triple systems using Fewbody including post-Newtonian terms. We find that the inner binary undergoes rapid eccentricity oscillations (REOs) on the timescale of the outer orbital period which drive it to higher eccentricities than secular theory would otherwise predict, resulting in substantially reduced merger times. For a uniform distribution of tertiary eccentricity ($e_2$), ~40% of systems merge within ~1-2 eccentric KL timescales whereas secular theory predicts that only ~20% of such systems merge that rapidly. This discrepancy becomes especially pronounced at low $e_2$, with secular theory overpredicting the merger time by many orders of magnitude. We show that a non-negligible fraction of systems have eccentricity > 0.8 when they merge, in contrast to predictions from secular theory. Our results are applicable to high mass ratio triple systems containing black holes or neutron stars. In objects in which tidal effects are important, such as white dwarfs, stars, and planets, REOs can reduce the tidal circularization timescale by an order of magnitude and bring the components of the inner binary into closer orbits than would be possible in the secular approximation.

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 Dates: 2013-08-262014-02-182014
 Publication Status: Published in print
 Pages: Accepted to MNRAS. 15 pages, 11 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1308.5682
DOI: 10.1093/mnras/stu039
URI: http://arxiv.org/abs/1308.5682
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 439 Sequence Number: - Start / End Page: 1079 - 1091 Identifier: ISSN: 1365-8711
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/1000000000024150