Tidal deformations of neutron stars with elastic crusts
Tidal deformations of neutron stars with elastic crusts
With the first detections of binary neutron star mergers by gravitational-wave detectors, it proves timely to consider how the internal structure of neutron stars affects the way in which they can be asymmetrically deformed. Such deformations may leave measurable imprints on gravitational-wave signals and can be sourced through tidal interactions or the formation of mountains. We detail the formalism that describes fully-relativistic neutron star models with elastic crusts undergoing static perturbations. This formalism primes the problem for studies into a variety of mechanisms that can deform a neutron star. We present results for a barotropic equation of state and a realistic model for the elastic crust, which enables us to compute relevant quantities such as the tidal deformability parameter. We find that the inclusion of an elastic crust provides a very small correction to the tidal deformability. The results allow us to demonstrate when and where the crust starts to fail during a binary inspiral and we find that the majority of the crust will remain intact up until merger.
Gittins, Fabian
657ec875-fac3-4606-9dcd-591ef22fc9f6
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Pereira, Jonas P.
d0461856-5302-410b-a35e-c53e951fd331
20 May 2020
Gittins, Fabian
657ec875-fac3-4606-9dcd-591ef22fc9f6
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Pereira, Jonas P.
d0461856-5302-410b-a35e-c53e951fd331
Gittins, Fabian, Andersson, Nils and Pereira, Jonas P.
(2020)
Tidal deformations of neutron stars with elastic crusts.
Physical Review D, 101 (10), [103025].
(doi:10.1103/PhysRevD.101.103025).
Abstract
With the first detections of binary neutron star mergers by gravitational-wave detectors, it proves timely to consider how the internal structure of neutron stars affects the way in which they can be asymmetrically deformed. Such deformations may leave measurable imprints on gravitational-wave signals and can be sourced through tidal interactions or the formation of mountains. We detail the formalism that describes fully-relativistic neutron star models with elastic crusts undergoing static perturbations. This formalism primes the problem for studies into a variety of mechanisms that can deform a neutron star. We present results for a barotropic equation of state and a realistic model for the elastic crust, which enables us to compute relevant quantities such as the tidal deformability parameter. We find that the inclusion of an elastic crust provides a very small correction to the tidal deformability. The results allow us to demonstrate when and where the crust starts to fail during a binary inspiral and we find that the majority of the crust will remain intact up until merger.
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Accepted/In Press date: 5 May 2020
e-pub ahead of print date: 20 May 2020
Published date: 20 May 2020
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© 2020 American Physical Society.
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Copyright 2020 Elsevier B.V., All rights reserved.
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Local EPrints ID: 440933
URI: http://eprints.soton.ac.uk/id/eprint/440933
ISSN: 1550-7998
PURE UUID: 929750be-ff4d-43fd-89ad-8b468e9f66ef
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Date deposited: 22 May 2020 16:40
Last modified: 17 Mar 2024 04:09
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Author:
Fabian Gittins
Author:
Jonas P. Pereira
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