自然倾斜逆进节状超隆起吸积盘的数值模拟
Numerical Simulations of Naturally Tilted, Retrogradely Precessing, Nodal Superhumping Accretion Disks
摘要：
黑洞、中子星和白矮星系统周围的吸积盘被认为有时会倾斜、逆行进动，并在光变曲线中产生周期短于轨道周期的驼峰形调制。虽然人工旋转数值模拟的吸积盘出轨道平面和周围的节点线产生这些短周期的超级驼峰和逆行岁差的磁盘，没有数字代码迄今已被证明自然产生磁盘倾斜。在这项工作中，我们报告了第一个自然倾斜的磁盘在非磁性激变变量（CV）使用3D光滑粒子流体动力学（SPH）。我们的模拟表明，经过数百个轨道周期后，圆盘会自行倾斜，而这种圆盘倾斜并没有辐射源或磁场的帮助。当系统绕轨道运行时，吸积流撞击亮点（位于倾斜盘的边缘），并在盘的上方和下方以不同的流动路径流动。这些不同的流动路径表明升力是盘倾斜的一个来源。我们的研究结果证实了磁盘的形状，磁盘结构，和负超峰周期和支持源磁盘倾斜，源逆行岁差，并与X射线和He II从磁盘发射的位置，如在以前的工作中所建议的。我们的研究结果确定了基本的负超峰频率作为指标的磁盘倾斜周围的节点线。
英文摘要：
Accretion disks around black hole, neutron star, and white dwarf systems are thought to sometimes tilt, retrogradely precess, and produce hump-shaped modulations in light curves that have a period shorter than the orbital period. Although artificially rotating numerically simulated accretion disks out of the orbital plane and around the line of nodes generates these short-period superhumps and retrograde precession of the disk, no numerical code to date has been shown to produce a disk tilt naturally. In this work, we report the first naturally tilted disk in non-magnetic Cataclysmic Variables (CVs) using 3D Smoothed Particle Hydrodynamics (SPH). Our simulations show that after many hundreds of orbital periods, the disk has tilted on its own and this disk tilt is without the aid of radiation sources or magnetic fields. As the system orbits, the accretion stream strikes the bright spot (which is on the rim of the tilted disk) and flows over and under the disk on different flow paths. These different flow paths suggest the lift force as a source to disk tilt. Our results confirm the disk shape, disk structure, and negative superhump period and support the source to disk tilt, source to retrograde precession, and location associated with X-ray and He II emission from the disk as suggested in previous works. Our results identify the fundamental negative superhump frequency as indicator of disk tilt around the line of nodes.
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