Expelled grains from an unseen parent body around AU Mic
\'Elie Sezestre, Jean-Charles Augereau, Anthony Boccaletti and, Philippe Th\'ebault

TL;DR
This paper models the observed fast-moving structures in AU Mic's debris disk as expelled dust from an unseen parent body, constraining its possible location and dust properties through numerical simulations.
Contribution
It introduces a new dynamical model explaining the structures as dust expelled by a hidden source, fitting observed features with high-beta grains and specific parent body locations.
Findings
High beta values (~6) imply sub-micronic grains and active star conditions.
Parent body likely located around 8 or 28 au depending on its motion.
Sequential dust release scenario explains the radial structure evolution.
Abstract
Recent observations of the debris disk of AU Mic have revealed asymmetric, fast outward-moving arch-like structures above the disk midplane. No model can readily explain the characteristics of these features. We present a model aiming to reproduce the dynamics of these structures, more specifically their high projected speeds and their apparent position. We test the hypothesis of dust emitted by a point source and then expelled from the system by the strong stellar wind of this young, M-type star. In this model, we make the assumption that the dust grains follow the same dynamics as the structures. We perform numerical simulations of test particle trajectories to explore the available parameter space, in particular the radial location of the dust producing parent body and the size of the dust grains as parameterized by (ratio of stellar wind and radiation pressure forces…
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