论文标题
无中心的无力中子星星磁层
Off-centred force-free neutron star magnetospheres
论文作者
论文摘要
中子星电磁活性产生的对填充了其磁层，该磁层通过无力的近似为零层。从这个简化的模型中，期望带电颗粒的耗散，加速度也不是辐射。到目前为止，仅在此限制下研究了以中心的偶极磁场的研究。在本文中，我们探讨了无力磁层上旋转偏心偶极子的后果，显示了新的磁场几何形状，其旋转的光度以及中子恒星的电磁踢和扭矩。解决方案是通过使用球形坐标编写的伪 - 柔性代码对无力度制度的时间依赖性数值模拟获得的。我们的结果还与已知的对偏离感空偶极偶极子发现的已知分析表达式进行了比较，通过在参数$ε= d/r $中扩展到最低顺序，其中$ d $是偶然中心的偶极子的位移，而中子恒星半径是$ r $ $ r $。无力等离子体的存在增强了旋转的发光度以及相对于无内心力偶极子的电磁踢和扭矩。根据这些新结果，对孤立和二进制中子星的影响进行了修订。
Neutron star electromagnetic activity produces pairs that fill their magnetosphere represented to the zeroth order by the force-free approximation. Neither dissipation nor acceleration nor radiation from charged particles is expected from this simplified model. So far, only centred dipole magnetic fields have been studied in this limit. In this paper, we explore the consequences of a rotating off-centred dipole on the force-free magnetosphere, showing the new magnetic field geometry, its spin-down luminosity as well as the electromagnetic kick and torque felt by the neutron star. Solutions are obtained by time-dependent numerical simulations of the force-free regime using our pseudo-spectral code written in spherical coordinates. Our results are also compared to known analytical expressions found for the off-centred vacuum dipole by an expansion to lowest order in the parameter $ε= d/R$, where $d$ is the displacement of the dipole from the stellar centre and $R$ the neutron star radius. The presence of a force-free plasma enhances the spin-down luminosity as well as the electromagnetic kick and torque with respect to a centred force-free dipole. The impact on isolated and binary neutron stars is revised in light of these new results.
