Formation of planetary debris discs around white dwarfs – I. Tidal disruption of an extremely eccentric asteroid

By D. Veras, Z. Leinhardt, Amy Bonsor, B. Gänsicke. 2014

140 citations recorded by the source corpus.

25–50 per cent of all white dwarfs (WDs) host observable and dynamically active remnant planetary systems based on the presence of close-in circumstellar dust and gas and photospheric metal pollution. Currently accepted theoretical explanations for the origin of this matter include asteroids that survive the star's giant branch evolution at au-scale distances and are subsequently perturbed on to WD-grazing orbits following stellar mass-loss. In this work, we investigate the tidal disruption of these highly eccentric (e > 0.98) asteroids as they approach and tidally disrupt around the WD. We analytically compute the disruption time-scale and compare the result with fully self-consistent numerical simulations of rubble piles by using the N-body code PKDGRAV. We find that this time-scale is highly dependent on the orbit's pericentre and largely independent of its semimajor axis. We establish that spherical asteroids readily break up and form highly eccentric collisionless rings, which do not accrete on to the WD without additional forces such as radiation or sublimation. This finding highlights the critical importance of such forces in the physics of WD planetary systems.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/85df0b427db9b176d78712c23070ce1a9b975a34

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In Astronomy and Astrophysics

1. J. Farihi
2. Michael Jura

Citations in the corpus

• Circumstellar Debris and Pollution at White Dwarf Stars (2016, background): “However, it has been demonstrated that the Oort-like cloud mass that can reach the Roche limit of the white dwarf is insignificant when compared to the observed metal abundances, and hence cannot be a source for polluted white dwarfs (Veras et al., 2014b).”