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Instabilities in neutron stars with toroidal magnetic fields

Instabilities in neutron stars with toroidal magnetic fields
Instabilities in neutron stars with toroidal magnetic fields
We study m= 1 oscillations and instabilities of magnetized neutron stars, by numerical time evolution of linear perturbations of the system. The background stars are stationary equilibrium configurations with purely toroidal magnetic fields. We find that an m= 1 instability of toroidal magnetic fields, already known from local analyses, may also be found in our relatively low-resolution global study. We present quantitative results for the instability growth rate and its suppression by rotation. The instability is discussed as a possible trigger mechanism for soft gamma repeater flares. Although our primary focus is evolutions of magnetized stars, we also consider perturbations about unmagnetized background stars in order to study m= 1 inertial modes. We track these modes up to break-up frequency ?K, extending known slow-rotation results.

instabilities, mhd, magnetic field, neutron, stars, oscillations, rotation
0035-8711
1394-1400
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160
Lander, S.K.
2cad9dc5-3e37-44ed-8ffc-009e7daba257
Jones, D.I.
b8f3e32c-d537-445a-a1e4-7436f472e160

Lander, S.K. and Jones, D.I. (2010) Instabilities in neutron stars with toroidal magnetic fields. Monthly Notices of the Royal Astronomical Society, 412 (2), 1394-1400. (doi:10.1111/j.1365-2966.2010.17998.x).

Record type: Article

Abstract

We study m= 1 oscillations and instabilities of magnetized neutron stars, by numerical time evolution of linear perturbations of the system. The background stars are stationary equilibrium configurations with purely toroidal magnetic fields. We find that an m= 1 instability of toroidal magnetic fields, already known from local analyses, may also be found in our relatively low-resolution global study. We present quantitative results for the instability growth rate and its suppression by rotation. The instability is discussed as a possible trigger mechanism for soft gamma repeater flares. Although our primary focus is evolutions of magnetized stars, we also consider perturbations about unmagnetized background stars in order to study m= 1 inertial modes. We track these modes up to break-up frequency ?K, extending known slow-rotation results.

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More information

Published date: April 2010
Keywords: instabilities, mhd, magnetic field, neutron, stars, oscillations, rotation
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 181537
URI: http://eprints.soton.ac.uk/id/eprint/181537
ISSN: 0035-8711
PURE UUID: e8a85f5d-f76d-4c80-8c81-26c0e5646155
ORCID for D.I. Jones: ORCID iD orcid.org/0000-0002-0117-7567

Catalogue record

Date deposited: 18 Apr 2011 11:02
Last modified: 09 Jan 2022 03:00

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Contributors

Author: S.K. Lander
Author: D.I. Jones ORCID iD

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