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Formation of planetary debris discs around white dwarfs - I. Tidal disruption of an extremely eccentric asteroid
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Veras, Dimitri, Leinhardt, Z. M., Bonsor, A. and Gänsicke, B. T. (Boris T.) (2014) Formation of planetary debris discs around white dwarfs - I. Tidal disruption of an extremely eccentric asteroid. Monthly Notices of the Royal Astronomical Society, Volume 445 (Number 3). pp. 2244-2255. doi:10.1093/mnras/stu1871
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Official URL: http://dx.doi.org/10.1093/mnras/stu1871
Abstract
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.
| Item Type: | Journal Article | ||||||||||
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| Divisions: | Faculty of Science > Physics | ||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
| Publisher: | Oxford University Press | ||||||||||
| ISSN: | 0035-8711 | ||||||||||
| Official Date: | 11 December 2014 | ||||||||||
| Dates: |
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| Volume: | Volume 445 | ||||||||||
| Number: | Number 3 | ||||||||||
| Page Range: | pp. 2244-2255 | ||||||||||
| DOI: | 10.1093/mnras/stu1871 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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