旋转、扭曲和同时进动
Tilt, Warp, and Simultaneous Precessions in Disks
摘要：
大质量致密物体周围的盘状空间中存在着翘曲现象。然而，所提出的翘曲源--非轴对称辐射压力--并不适用于白矮星。在这封信中，我们报告了第一个光滑粒子流体动力学模拟的吸积盘在SU UMA型系统，自然倾斜，翘曲，并同时进动的顺时针和逆行方向使用白矮星V344天琴座在开普勒领域作为我们的模型。在V344天琴座大约79天后，盘角动量L_d与轨道角动量L_o偏离。当气流保持垂直于L_o时，流体动力学（例如，提升力）是盘倾斜的可能来源。除了倾斜，外盘环周期性地改变形状，从圆形到高度偏心，这是由于次级恒星的潮汐扭矩。同时发生的旋进和逆行的影响是沿着盘边缘看到的较冷、密度较高的中平面的弯曲。每个轨道的拱点推进到节点回归的模拟速率几乎与V344天琴座中观测到的比率相匹配。
英文摘要：
Warps are suspected in disks around massive compact objects. However, the proposed warping source -- non-axisymmetric radiation pressure -- does not apply to white dwarfs. In this letter we report the first Smoothed Particle Hydrodynamic simulations of accretion disks in SU UMa-type systems that naturally tilt, warp, and simultaneously precess in the prograde and retrograde directions using white dwarf V344 Lyrae in the Kepler field as our model. After ~79 days in V344 Lyrae, the disk angular momentum L_d becomes misaligned to the orbital angular momentum L_o. As the gas stream remains normal to L_o, hydrodynamics (e.g., the lift force) is a likely source to disk tilt. In addition to tilt, the outer disk annuli cyclically change shape from circular to highly eccentric due to tidal torques by the secondary star. The effect of simultaneous prograde and retrograde precession is a warp of the colder, denser midplane as seen along the disk rim. The simulated rate of apsidal advance to nodal regression per orbit nearly matches the observed ratio in V344 Lyrae.
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