Strong toroidal magnetic fields sustained by the elastic crust in a neutron star
Strong toroidal magnetic fields sustained by the elastic crust in a neutron star
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中子星弹性地壳维持的强环形磁场
DOI：
10.1093/mnras/stac3750
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发表时间：
2022
影响因子：
4.8
通讯作者：
Kisaka Shota
中科院分区：
文献类型：
--
作者：
Fujisawa Kotaro;Kojima Yasufumi;Kisaka Shota
本文研究了磁流体动力学（MHD）平衡下具有正压核和磁弹性壳的磁化中子星的新解，这一点在以往的MHD平衡下的研究中被忽略了。正压星星的洛伦兹力是纯无旋的，磁场结构受到限制。相比之下，洛伦兹力的螺线管分量存在于弹性地壳中，并且磁场的结构受到较少的限制。我们发现，在弹性地壳中的小螺线管组件是重要的维持在核心的强磁场。与以前的研究不同，环向磁场存在于整个区域的核心，我们得到了平衡态与大的环向磁场，其中的环向磁能大于极向磁能。地壳的弹性力在地核中维持着1015G量级的环向磁场，且环向磁场的最大强度与地壳厚度近似成正比。
We investigate new solutions for magnetized neutron stars with a barotropic core in magnetohydrodynamic (MHD) equilibrium and a magnetoelastic crust, which was neglected by previous studies concerning stars in MHD equilibrium. The Lorentz force of the barotropic star is purely irrotational and the structures of magnetic fields are constrained. By contrast, a solenoidal component of the Lorentz force exists in the elastic crust and the structures of the magnetic fields are less restricted. We find that the minor solenoidal component in the elastic crust is important for sustaining the strong magnetic field in the core. Unlike previous studies, the toroidal magnetic field exists in the entire region of the core, and we obtain equilibrium states with large toroidal magnetic fields, where the toroidal magnetic energy is larger than the poloidal magnetic energy. The elastic force of the crust sustains an order of 1015G toroidal magnetic field in the core, and the maximum strength of the toroidal magnetic field is approximately proportional to the crust thickness.