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Post-main-sequence debris from rotation-induced YORP break-up of small bodies
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Veras, Dimitri, Jacobson, S. A. and Gänsicke, B. T. (Boris T.) (2014) Post-main-sequence debris from rotation-induced YORP break-up of small bodies. Monthly Notices of the Royal Astronomical Society, Volume 445 (Number 3). pp. 2794-2799. doi:10.1093/mnras/stu1926 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stu1926
Abstract
Although discs of dust and gas have been observed orbiting white dwarfs, the origin of this circumstellar matter is uncertain. We hypothesize that the in situ break-up of small bodies such as asteroids spun to fission during the giant branch phases of stellar evolution provides an important contribution to this debris. The YORP (Yarkovsky–O'Keefe–Radviesvki–Paddock) effect, which arises from radiation pressure, accelerates the spin rate of asymmetric asteroids, which can eventually shear themselves apart. This pressure is maintained and enhanced around dying stars because the outward push of an asteroid due to stellar mass loss is insignificant compared to the resulting stellar luminosity increase. Consequently, giant star radiation will destroy nearly all bodies with radii in the range 100 m–10 km that survive their parent star's main-sequence lifetime within a distance of about 7 au; smaller bodies are spun apart to their strongest, competent components. This estimate is conservative and would increase for highly asymmetric shapes or incorporation of the inward drag due to giant star stellar wind. The resulting debris field, which could extend to thousands of au, may be perturbed by remnant planetary systems to reproduce the observed dusty and gaseous discs which accompany polluted white dwarfs.
| Item Type: | Journal Article | ||||||||||
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| Divisions: | Faculty of Science, Engineering and Medicine > 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. 2794-2799 | ||||||||||
| DOI: | 10.1093/mnras/stu1926 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Adapted As: |
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