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- W2126318126 abstract "The formation channel of the tens of compact debris discs which orbit white dwarfs (WDs) at a distance of 1 R⊙ remains unknown. Asteroids that survive the giant branch stellar phases beyond a few au are assumed to be dynamically thrust towards the WD and tidally disrupted within its Roche radius, generating extremely eccentric (e > 0.98) rings. Here, we establish that WD radiation compresses and circularizes the orbits of supermicron to cm-sized ring constituents to entirely within the WD's Roche radius. We derive a closed algebraic formula which well-approximates the shrinking time as a function of WD cooling age, the physical properties of the star and the physical and orbital properties of the ring particles. The shrinking time-scale increases with both particle size and cooling age, yielding age-dependent WD debris disc size distributions." @default.
- W2126318126 created "2016-06-24" @default.
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- W2126318126 date "2015-06-25" @default.
- W2126318126 modified "2023-10-16" @default.
- W2126318126 title "Formation of planetary debris discs around white dwarfs – II. Shrinking extremely eccentric collisionless rings" @default.
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- W2126318126 doi "https://doi.org/10.1093/mnras/stv1195" @default.
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