Magnetic neutron star equilibria with stratification and type II superconductivity

S. K. Lander, N. Andersson, K. Glampedakis

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33 Citations (Scopus)

Abstract

We construct two-fluid equilibrium configurations for neutron stars (NSs) with magnetic fields, using a self-consistent and non-linear numerical approach. The two-fluid approach - likely to be valid for large regions of all but the youngest NSs - provides us with a straightforward way to introduce stratification and allows for more realistic models than the ubiquitous barotropic assumption. In all our models, the neutrons are modelled as a superfluid, whilst for the protons we consider two cases: one where they are a normal fluid and another where they form a type II superconductor. We consider a variety of field configurations in the normal-proton case and purely toroidal fields in the superconducting case. We find that stratification allows for a stronger toroidal component in mixed-field configurations, though the poloidal component remains the largest in all our models. We provide quantitative results for magnetic ellipticities of NSs, both in the normal- and superconducting-proton cases.

Original languageEnglish
Pages (from-to)732-747
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume419
Issue number1
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • MHD
  • Stars: magnetars
  • Stars: magnetic field
  • Stars: neutron

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