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From proto-neutron star dynamo to low-field magnetars

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arxiv 2501.04768 v1 pith:FORPLMT4 submitted 2025-01-08 astro-ph.HE

Andrei Igoshev , Paul Barrère , Raphaël Raynaud , Jérome Guilet , Toby Wood , Rainer Hollerbach This is my paper
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keywords magnetarslow-fielddynamofieldsmagneticburstsclassicaldipolar
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abstract

Low-field magnetars have dipolar magnetic fields that are 10-100 times weaker than the threshold, $B \gtrsim 10^{14}$ G, used to define classical magnetars, yet they produce similar X-ray bursts and outbursts. Using the first direct numerical simulations of magneto-thermal evolution starting from a dynamo-generated magnetic field, we show that the low-field magnetars can be produced as a result of a Tayler--Spruit dynamo inside the proto-neutron star. We find that these simulations naturally explain key characteristics of low-field magnetars: (1) weak ($\lesssim 10^{13}$ G) dipolar magnetic fields, (2) strong small-scale fields, and (3) magnetically induced crustal failures producing X-ray bursts. These findings suggest two distinct formation channels for classical and low-field magnetars, potentially linked to different dynamo mechanisms.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Impact of magnetic field-driven anisotropies on the equation of state probed in neutron star mergers

    astro-ph.HE 2025-06 conditional novelty 7.0 of 10

    Pressure from magnetically quantized nuclear matter can be more than 10% anisotropic in the outer layers of a neutron star merger remnant if the dynamo reaches its most optimistic strength.

  2. Understanding the Neutron Star Population with the SKAO Telescopes

    astro-ph.HE 2026-07 accept novelty 3.5 of 10

    SKAO AA* and AA4 surveys are projected to discover thousands of ordinary pulsars and ~800–1000 MSPs, enabling population synthesis, mass measurements and tests of gravity and emission physics.

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