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• W3100482215 abstract "We explain the fast-moving, ripple-like features in the edge-on debris disk orbiting the young M dwarf AU Mic. The bright features are clouds of sub-micron dust repelled by the host star's wind. The clouds are produced by avalanches: radial outflows of dust that gain exponentially more mass as they shatter background disk particles in collisional chain reactions. The avalanches are triggered from a region a few AU across -- the avalanche zone -- located on AU Mic's primary birth ring, at a true distance of $sim$35 AU from the star but at a projected distance more than a factor of 10 smaller: the avalanche zone sits directly along the line of sight to the star, on the side of the ring nearest Earth, launching clouds that disk rotation sends wholly to the southeast, as observed. The avalanche zone marks where the primary ring intersects a secondary ring of debris left by the catastrophic disruption of a progenitor up to Varuna in size, less than tens of thousands of years ago. Only where the rings intersect are particle collisions sufficiently violent to spawn the sub-micron dust needed to seed the avalanches. We show that this picture works quantitatively, reproducing the masses, sizes, and velocities of the observed escaping clouds. The Lorentz force exerted by the wind's magnetic field, whose polarity reverses periodically according to the stellar magnetic cycle, promises to explain the observed vertical undulations. The timescale between avalanches, about 10 yr, might be set by time variability of the wind mass-loss rate or, more speculatively, by some self-regulating limit cycle." @default.
• W3100482215 created "2020-11-23" @default.
• W3100482215 creator A5032207848 @default.
• W3100482215 creator A5054752237 @default.
• W3100482215 date "2017-10-05" @default.
• W3100482215 modified "2023-09-29" @default.
• W3100482215 title "Stellar Winds and Dust Avalanches in the AU Mic Debris Disk" @default.
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• W3100482215 doi "https://doi.org/10.3847/1538-4357/aa89e6" @default.
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