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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1307.7020 (astro-ph)
[Submitted on 26 Jul 2013 (v1), last revised 6 Jul 2014 (this version, v2)]

Title:The contrasting magnetic fields of superconducting pulsars and magnetars

Authors:S. K. Lander
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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 order $10^{15}$ 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 $B_\textrm{pole}\sim 10^{14}$ 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.
Comments: 14 pages, 10 figures, 1 table. Minor changes to match published version
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Superconductivity (cond-mat.supr-con)
Cite as: arXiv:1307.7020 [astro-ph.HE]
  (or arXiv:1307.7020v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1307.7020
Journal reference: MNRAS 437, 424 (2014)
Related DOI: https://doi.org/10.1093/mnras/stt1894

Submission history

From: Samuel Lander [view email]
[v1] Fri, 26 Jul 2013 12:51:53 UTC (806 KB)
[v2] Sun, 6 Jul 2014 14:44:36 UTC (807 KB)
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