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Neutron Star–Black Hole Mergers from Gravitational-wave Captures

Hoang, Bao-Minh and Naoz, Smadar and Kremer, Kyle (2020) Neutron Star–Black Hole Mergers from Gravitational-wave Captures. Astrophysical Journal, 903 (1). Art. No. 8. ISSN 1538-4357. doi:10.3847/1538-4357/abb66a.

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LIGO's third observing run (O3) has reported several neutron star–black hole (NSBH) merger candidates. From a theoretical point of view, NSBH mergers have received less attention in the community than either binary black holes, or binary neutron stars. Here we examine single–single (sin–sin) gravitational wave (GW) captures in different types of star clusters—galactic nuclei, globular clusters, and young stellar clusters—and compare the merger rates from this channel to other proposed merger channels in the literature. There are currently large uncertainties associated with every merger channel, making a definitive conclusion about the origin of NSBH mergers impossible. However, keeping these uncertainties in mind, we find that sin–sin GW capture is unlikely to significantly contribute to the overall NSBH merger rate. In general, it appears that isolated binary evolution in the field or in clusters, and dynamically interacting binaries in triple configurations, may result in a higher merger rate.

Item Type:Article
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URLURL TypeDescription Paper
Hoang, Bao-Minh0000-0003-0992-0033
Naoz, Smadar0000-0002-9802-9279
Kremer, Kyle0000-0002-4086-3180
Additional Information:© 2020 The American Astronomical Society. Received 2020 July 14; revised 2020 September 3; accepted 2020 September 4; published 2020 October 26. We thank Bence Kocsis for helpful discussions. B.M.H. and S.N. acknowledge the partial support of NASA grant No. 80NSSC19K0321 and No. 80NSSC20K0505. S.N. also thanks Howard and Astrid Preston for their generous support. K.K. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-2001751.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Howard and Astrid PrestonUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-2001751
Subject Keywords:Neutron stars ; Stellar mass black holes ; Gravitational wave sources ; Young star clusters ; Globular star clusters ; Galactic center ; Stellar dynamics
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Neutron stars (1108); Stellar mass black holes (1611); Gravitational wave sources (677); Young star clusters (1833); Globular star clusters (656); Galactic center (565); Stellar dynamics (1596)
Record Number:CaltechAUTHORS:20201028-095737790
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Official Citation:Bao-Minh Hoang et al 2020 ApJ 903 8
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106323
Deposited By: Tony Diaz
Deposited On:29 Oct 2020 18:33
Last Modified:16 Nov 2021 18:52

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