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Quasi-universal behavior of the threshold mass in unequal-mass, spinning binary neutron star mergers

  • The lifetime of the remnant produced by the merger of two neutron stars can provide a wealth of information on the equation of state of nuclear matter and on the processes leading to the electromagnetic counterpart. Hence, it is essential to determine when this lifetime is the shortest, corresponding to when the remnant has a mass equal to the threshold mass, Mth, to prompt collapse to a black hole. We report on the results of more than 360 simulations of merging neutron-star binaries covering 40 different configurations differing in mass ratio and spin of the primary. Using this data, we have derived a quasi-universal relation for Mth and expressed its dependence on the mass ratio and spin of the binary. The new expression recovers the results of Koeppel et al. for equal-mass, irrotational binaries and reveals that Mth can increase (decrease) by 5% (10%) for binaries that have spins aligned (antialigned) with the orbital angular momentum and provides evidence for a nonmonotonic dependence of Mth on the mass asymmetry in the system. Finally, we extend to unequal masses and spinning binaries the lower limits that can be set on the stellar radii once a neutron star binary is detected, illustrating how the merger of an unequal-mass, rapidly spinning binary can significantly constrain the allowed values of the stellar radii.

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Author:Samuel D. TootleORCiDGND, Ludwig Jens PapenfortORCiD, Elias Roland MostORCiDGND, Luciano RezzollaORCiDGND
URN:urn:nbn:de:hebis:30:3-628631
DOI:https://doi.org/10.3847/2041-8213/ac350d
ISSN:2041-8213
Parent Title (English):The Astrophysical Journal Letters
Publisher:Institute of Physics Publ.
Place of publication:London
Document Type:Article
Language:English
Date of Publication (online):2021/11/19
Date of first Publication:2021/11/19
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/10/26
Tag:Binary pulsars; Black holes; Compact binary stars; Compact objects; General relativity; Gravitational collapse; Neutron stars; Stellar remnants
Volume:922
Issue:1
Page Number:8
First Page:1
Last Page:8
Note:
Unified Astronomy Thesaurus concepts:
Compact binary stars (283);
General relativity (641);
Gravitational collapse (662);
Neutron stars (1108);
Compact objects (288);
Stellar remnants (1627);
Black holes (162);
Binary pulsars (153)
Note:
L.R. acknowledges the support by the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006). E.R.M. acknowledges support from the Princeton Center for Theoretical Science, the Princeton Gravity Initiative, and the Institute for Advanced Study. The simulations were performed on HPE Apollo Hawk at the High Performance Computing Center Stuttgart (HLRS) under the grants BBHDISKS and BNSMIC, and on SuperMUC at the Leibniz Supercomputing Centre.
HeBIS-PPN:502476281
Institutes:Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Forschungscluster / ELEMENTS
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0