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Ambipolar diffusion in superfluid neutron stars
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- Glampedakis, Kostas (author)
- Theoretical Astrophysics, University of Tübingen
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- Jones, D. Ian (author)
- School of Mathematics, University of Southampton
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- Samuelsson, Lars, 1974- (author)
- Umeå universitet,Institutionen för fysik,Nordita, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
- (creator_code:org_t)
- 2011-03-29
- 2011
- English.
- In: Monthly notices of the Royal Astronomical Society. - : Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 413:3, s. 2021-2030
- Journal article (other academic/artistic)
Abstract
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- In this paper we reconsider the problem of magnetic field diffusion in neutron star cores. We model the star as consisting of a mixture of neutrons, protons and electrons, and allow for particle reactions and binary collisions between species. Our analysis is in much the same spirit as that of Goldreich & Reisenegger (1992), and we content ourselves with rough estimates of magnetic diffusion timescales, rather than solving accurately for some particular field geometry. However, our work improves upon previous treatments in one crucial respect: we allow for superfluidity in the neutron star matter. We find that the consequent mutual friction force, coupling the neutrons and charged particles, together with the suppression of particles collisions and reactions, drastically affect the ambipolar magnetic field diffusion timescale. In particular, the addition of superfluidity means that it is unlikely that there is ambipolar diffusion in magnetar cores on the timescale of the lifetimes of these objects, contradicting an assumption often made in the modelling of the flaring activity commonly observed in magnetars. Our work suggests that if a decaying magnetic field is indeed the cause of magnetar activity, the field evolution is likely to take place outside of the core, and might represent Hall/Ohmic diffusion in the stellar crust, or else that a mechanism other than standard ambipolar diffusion is active, e.g. flux expulsion due to the interaction between neutron vortices and magnetic fluxtubes.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Astronomy and astrophysics
- Astronomi och astrofysik
- fysik
- Physics
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- vet (subject category)
- art (subject category)
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