关于扭曲的磁螺纹吸积盘所施加的扭矩
On the torque exerted by a warped, magnetically threaded accretion disk
摘要：
大多数天体物理学上的吸积盘都可能是翘曲的。在X射线双星中，吸积中子星的自旋演化与中子星磁场和吸积盘之间的相互作用密切相关。关于中子星磁场穿过共面吸积盘所产生的吸积力矩，已有大量的研究，但关于翘曲/倾斜吸积盘的相关工作还很缺乏。在本文中，我们开发了一个简化的两个组件模型，其中的磁盘是由一个内共面部分和一个外，倾斜的一部分。基于环向磁场分量的形成和演化的标准假设，我们导出了无量纲力矩，证明了与共面圆盘相比，翘曲/倾斜圆盘更容易使中子星自旋上升，并讨论了各种初始参数对力矩的可能影响。
英文摘要：
Most astrophysical accretion disks are likely to be warped. In X-ray binaries the spin evolution of an accreting neutron star is critically dependent on the interaction between the neutron star magnetic field and the accretion disk. There have been extensive investigations on the accretion torque exerted by a coplanar disk that is magnetically threaded by the magnetic field lines from the neutron stars, but relevant works on warped/tilted accretion disks are still lacking. In this paper we develop a simplified two-component model, in which the disk is comprised of an inner coplanar part and an outer, tilted part. Based on standard assumption on the formation and evolution of the toroidal magnetic field component, we derive the dimensionless torque and show that a warped/titled disk is more likely to spin up the neutron star compared with a coplanar disk.We also discuss the possible influence of various initial parameters on the torque.
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