Instabilities in neutron stars with toroidal magnetic fields

Details Instabilities in neutron stars with toroidal magnetic fields Instabilities in neutron stars with toroidal magnetic fields

2010-09-13

arxiv.org/abs/1009.2453v2

MNRAS 412, 1394 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 8 figures. Very minor changes from v1 and one reference added, to match MNRAS-accepted version

Scientific paper

We study $m=1$ oscillations and instabilities of magnetised 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 (SGR) flares. Although our primary focus is evolutions of magnetised stars, we also consider perturbations about unmagnetised background stars in order to study $m=1$ inertial modes. We track these modes up to break-up frequency, extending known slow-rotation results.

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