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Initial data for high-compactness black hole–neutron star binaries

Henriksson, Katherine and Foucart, François and Kidder, Lawrence E. and Teukolsky, Saul A. (2016) Initial data for high-compactness black hole–neutron star binaries. Classical and Quantum Gravity, 33 (10). Art. no. 105009. ISSN 0264-9381.

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For highly compact neutron stars, constructing numerical initial data for black hole–neutron star binary evolutions is very difficult. We describe improvements to an earlier method that enable it to handle these more challenging cases. These improvements were found by invoking a general relaxation principle that may be helpful in improving robustness in other initial data solvers. We examine the case of a 6:1 mass ratio system in inspiral close to merger, where the star is governed by a polytropic Γ =2, an SLy, or an LS220 equation of state (EOS). In particular, we are able to obtain a solution with a realistic LS220 EOS for a star with compactness 0.26 and mass 1.98 M_⊙, which is representative of the highest reliably determined neutron star masses. For the SLy EOS, we can obtain solutions with a comparable compactness of 0.25, while for a family of polytropic equations of state, we obtain solutions with compactness up to 0.21, the largest compactness that is stable in this family. These compactness values are significantly higher than any previously published results.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Foucart, François0000-0003-4617-4738
Kidder, Lawrence E.0000-0001-5392-7342
Teukolsky, Saul A.0000-0001-9765-4526
Additional Information:© 2016 IOP Publishing Ltd. Received 22 January 2016. Accepted for publication 26 February 2016. Published 19 April 2016. K H would like to thank Geoffrey Lovelace, Curran Muhlberger, Harald Pfeiffer, and David Chernoff for useful discussions, and Andy Bohn for the use of computing resources. This work was supported in part by NSF Grants PHY-1306125 and AST-1333129 at Cornell University, and by a grant from the Sherman Fairchild Foundation. F F gratefully acknowledges support from the Vincent and Beatrice Tremaine Postdoctoral Fellowship and NSERC Canada. Support for this work was provided by NASA through Einstein Postdoctoral Fellowship grant number PF4-150122 awarded by the Chandra X-ray Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. This research was performed in part using the Zwicky computer system operated by the Caltech Center for Advanced Computing Research and funded by NSF MRI No. PHY-0960291 and the Sherman Fairchild Foundation.
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
Vincent and Beatrice Tremaine Postdoctoral FellowshipUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
NASA Einstein FellowshipPF4-150122
Subject Keywords:neutron stars, initial value problem, black holes, relativity and gravitation, relativistic binaries
Issue or Number:10
Record Number:CaltechAUTHORS:20180605-163331410
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Official Citation:Katherine Henriksson et al 2016 Class. Quantum Grav. 33 105009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86815
Deposited By: George Porter
Deposited On:06 Jun 2018 14:49
Last Modified:09 Mar 2020 13:18

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