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Precessional dynamics of black hole triples: binary mergers with near-zero effective spin

Antonini, Fabio, Rodriguez, Carl L, Petrovich, C and Fischer, C (2018) Precessional dynamics of black hole triples: binary mergers with near-zero effective spin Monthly Notices of the Royal Astronomical Society: Letters, 480 (1). L58-L62.

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Abstract

The binary black hole mergers detected by Advanced LIGO/Virgo have shown no evidence of large black hole spins. However, because LIGO/Virgo best measures the effective combination of the two spins along the orbital angular momentum (Xeff), it is difficult to distinguish between binaries with slowly-spinning black holes and binaries with spins lying in the orbital plane. Here, we study the spin dynamics for binaries with a distant black hole companion. For spins initially aligned with the orbital angular momentum of the binary, we find that Xeff \freezes" near zero as the orbit decays through the emission of gravitational waves. Through a population study, we show that this process predominantly leads to merging black hole binaries with near-zero Xeff. We conclude that if the detected black hole binaries were formed in triples, then this would explain their low _eff without the need to invoke near-zero spins or initially large spin-orbit angles.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Antonini, Fabiof.antonini@surrey.ac.uk
Rodriguez, Carl L
Petrovich, C
Fischer, C
Date : 12 July 2018
Funders : STFC
DOI : 10.1093/mnrasl/sly126
Copyright Disclaimer : This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters, following peer review. The version of record Fabio Antonini, Carl L Rodriguez, Cristobal Petrovich, Caitlin L Fischer; Precessional dynamics of black hole triples: binary mergers with near-zero effective spin, Monthly Notices of the Royal Astronomical Society: Letters, Volume 480, Issue 1, 11 October 2018, Pages L58–L62, https://doi.org/10.1093/mnrasl/sly126 is available online at: https://academic.oup.com/mnrasl/article-abstract/480/1/L58/5053071
Uncontrolled Keywords : black hole physics { gravitational waves { stars: kinematics and dynamics
Depositing User : Melanie Hughes
Date Deposited : 18 Jul 2018 09:06
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/848730

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