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Does elasticity stabilise a magnetic neutron star?

Does elasticity stabilise a magnetic neutron star?
Does elasticity stabilise a magnetic neutron star?
The configuration of the magnetic field in the interior of a neutron star is mostly unknown from observations. Theoretical models of the interior magnetic field geometry tend to be oversimplified to avoid mathematical complexity and tend to be based on axisymmetric barotropic fluid systems. These static magnetic equilibrium configurations have been shown to be unstable on a short time scale against an infinitesimal perturbation. Given this instability, it is relevant to consider how more realistic neutron star physics affects the outcome. In particular, it makes sense to ask if elasticity, which provides an additional restoring force on the perturbations, may stabilise the system. It is well-known that the matter in the neutron star crust forms an ionic crystal. The interactions between the crystallized nuclei can generate shear stress against any applied strain. To incorporate the effect of the crust on the dynamical evolution of the perturbed equilibrium structure, we study the effect of elasticity on the instability of an axisymmetric magnetic star. In particular we determine the critical shear modulus required to prevent magnetic instability and consider the corresponding astrophysical consequences.
astro-ph.HE, astro-ph.SR
0035-8711
12
Bera, Prasanta
80323081-87cb-4f60-962c-a8c9cd3a3f3b
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304
Bera, Prasanta
80323081-87cb-4f60-962c-a8c9cd3a3f3b
Jones, D. I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Andersson, Nils
2dd6d1ee-cefd-478a-b1ac-e6feedafe304

Bera, Prasanta, Jones, D. I. and Andersson, Nils (2020) Does elasticity stabilise a magnetic neutron star? Monthly Notices of the Royal Astronomical Society, 499 (2), 12. (doi:10.1093/mnras/staa3015).

Record type: Article

Abstract

The configuration of the magnetic field in the interior of a neutron star is mostly unknown from observations. Theoretical models of the interior magnetic field geometry tend to be oversimplified to avoid mathematical complexity and tend to be based on axisymmetric barotropic fluid systems. These static magnetic equilibrium configurations have been shown to be unstable on a short time scale against an infinitesimal perturbation. Given this instability, it is relevant to consider how more realistic neutron star physics affects the outcome. In particular, it makes sense to ask if elasticity, which provides an additional restoring force on the perturbations, may stabilise the system. It is well-known that the matter in the neutron star crust forms an ionic crystal. The interactions between the crystallized nuclei can generate shear stress against any applied strain. To incorporate the effect of the crust on the dynamical evolution of the perturbed equilibrium structure, we study the effect of elasticity on the instability of an axisymmetric magnetic star. In particular we determine the critical shear modulus required to prevent magnetic instability and consider the corresponding astrophysical consequences.

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staa3015 - Accepted Manuscript
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More information

Accepted/In Press date: 28 September 2020
e-pub ahead of print date: 2 October 2020
Keywords: astro-ph.HE, astro-ph.SR

Identifiers

Local EPrints ID: 444397
URI: http://eprints.soton.ac.uk/id/eprint/444397
ISSN: 0035-8711
PURE UUID: b5fc5c82-7dd4-4ba2-8976-19cc1ab16f06
ORCID for Prasanta Bera: ORCID iD orcid.org/0000-0003-1315-4984
ORCID for D. I. Jones: ORCID iD orcid.org/0000-0002-0117-7567
ORCID for Nils Andersson: ORCID iD orcid.org/0000-0001-8550-3843

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Date deposited: 16 Oct 2020 16:30
Last modified: 28 Apr 2022 02:27

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Contributors

Author: Prasanta Bera ORCID iD
Author: D. I. Jones ORCID iD
Author: Nils Andersson ORCID iD

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