椭圆开普勒轨道上的气体动力学摩擦
Gaseous Dynamical Friction on Elliptical Keplerian Orbits
AI总结：
该研究计算椭圆开普勒轨道上大质量扰动体受的气体动力学摩擦力，分析单扰动体与等质量双星的轨道演化规律，揭示不同声速条件下偏心率变化特征及长期演化趋势，并公开相关数据。
摘要：
我们计算了大质量扰动体在椭圆开普勒轨道上所受的气体动力学摩擦（Gaseous Dynamical Friction, GDF）力。本文研究了大质量单个扰动体以及等质量双星嵌入均匀静态背景流中的密度尾迹形态、动力学摩擦力和长期轨道演化。在所有情形下，半长轴的变化率均为负值（符合预期），而偏心率变化率在严格亚声速轨迹下为负，在严格超声速轨迹下为正。跨声速轨道在一个轨道周期内可能同时受到正、负扭矩，部分轨道偏心率会增大，另一部分则会圆化。我们观测到，由于半长轴持续衰减使马赫数升高，进而驱动偏心率变化，所有初始轨道在足够长的时间尺度上都会变为高度超声速且高偏心率的状态。我们将研究结果与此前针对直线运动和圆周运动的研究进行了对比，同时公开了轨道衰减的相关数据。
英文摘要：
We compute the Gaseous Dynamical Friction (GDF) force experienced by massive perturbers on elliptical Keplerian orbits. In this paper, we investigate the density wake morphology, dynamical friction force, and secular orbital evolution for massive single perturbers as well as equal mass binaries embedded in an homogenous, static background flow. In all cases, the rate-of-change in semi-major axis is found to be negative (as expected), whereas the rate-of-change in eccentricity is negative for strictly-subsonic trajectories and positive for strictly-supersonic trajectories. Transonic orbits can experience both positive and negative torques during the course of an orbit, with some growing in eccentricity and others circularising. We observe all initial orbits becoming highly supersonic and eccentric (over sufficiently long timescales) due to a relentless semi-major axis decay increasing the Mach number and subsequent eccentricity driving. We compare our findings to previous studies for rectilinear and circular motion, while also making our data for orbital decay available.
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