Gaseous Dynamical Friction on Elliptical Keplerian Orbits
arxiv(2024)
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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