The contrasting magnetic fields of superconducting pulsars and magnetars

Lander, S. K. (2014) The contrasting magnetic fields of superconducting pulsars and magnetars. Monthly Notices of the Royal Astronomical Society, 437 (1). pp. 424-436. ISSN 0035-8711

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Abstract

We study equilibrium magnetic field configurations in a neutron star (NS) whose core has type-II superconducting protons. Unlike the equations for normal matter, which feature no special field strength, those for superconductors contain the lower critical field, of the order of 1015 G. We find that the ratio of this critical field to the smooth-averaged stellar field at the crust-core boundary is the key feature dictating the field geometry. Our results suggest that pulsar- and magnetar-strength fields have notably different configurations. Field decay for NSs with Bpole ~ 1014 G could thus result in substantial internal rearrangements, pushing the toroidal field component out of the core; this may be related to observed magnetar activity. In addition, we calculate the magnetically induced ellipticities of our models.

Item Type: Article
Uncontrolled Keywords: magnetars-stars,magnetic field-stars,neutron.,stars,astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103
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Depositing User: LivePure Connector
Date Deposited: 28 Jan 2020 03:52
Last Modified: 22 Apr 2020 08:34
URI: https://ueaeprints.uea.ac.uk/id/eprint/73808
DOI: 10.1093/mnras/stt1894

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