A connection between proto-neutron-star Tayler–Spruit dynamos and low-field magnetars

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-02-04 DOI:10.1038/s41550-025-02477-y

Andrei Igoshev, Paul Barrère, Raphaël Raynaud, Jérome Guilet, Toby Wood, Rainer Hollerbach

引用次数: 0

Abstract

Low-field magnetars have dipolar magnetic fields of 10¹²–10¹³ G, 10–100 times weaker than the values of magnetic-field strength B ≈ 10¹⁴–10¹⁵ G used to define classical magnetars, yet they produce similar X-ray bursts and outbursts. Using direct numerical simulations of magnetothermal 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 a proto-neutron star. We find that these simulations naturally explain key characteristics of low-field magnetars: weak (≲10¹³ G) dipolar magnetic fields, strong small-scale fields and magnetically induced crustal failures producing X-ray bursts. These findings suggest that the formation channel of low-B magnetars is distinct from that for classical magnetars, reflecting potential differences in proto-neutron-star dynamos.

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原始中子星泰勒-斯普瑞特发电机与低场磁星之间的联系

低磁场磁星的偶极磁场为1012-1013 G，比用于定义经典磁星的磁场强度B≈1014-1015 G弱10-100倍，但它们产生类似的x射线爆发和爆发。利用从发电机产生的磁场开始的磁热演化的直接数值模拟，我们证明了低场磁星可以由原始中子星内部的泰勒-斯普瑞特发电机产生。我们发现这些模拟很自然地解释了低场磁星的关键特征：弱（> 1013 G）偶极磁场、强小尺度磁场和产生x射线暴的磁致地壳破坏。这些发现表明，低b磁星的形成通道与经典磁星不同，反映了原中子星发电机的潜在差异。

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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