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Generating metal-polluting debris in white dwarf planetary systems from small-impact crater ejecta
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Kurosawa, Kosuke and Veras, Dimitri (2020) Generating metal-polluting debris in white dwarf planetary systems from small-impact crater ejecta. Monthly Notices of the Royal Astronomical Society, 494 (1). pp. 442-457. staa621. doi:10.1093/mnras/staa621
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WRAP-generating-metal-polluting-debris-white-dwarf-small-crater-ejecta-Veras-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1556Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/staa621
Abstract
Metal pollution in white dwarf photospheres originates from the accretion of some combination of planets, moons, asteroids, comets, boulders, pebbles and dust. When large bodies reside in dynamically stagnant locations – unable themselves to pollute nor even closely approach the white dwarf – then smaller reservoirs of impact debris may become a complementary or the primary source of metal pollutants. Here, we take a first step towards exploring this possibility by computing limits on the recoil mass that escapes the gravitational pull of the target object following a single impact onto an atmosphere-less surface. By considering vertical impacts only with the full-chain analytical prescription from Kurosawa & Takada (2019), we provide lower bounds for the ejected mass for basalt, granite, iron and water-rich target objects across the radii range 100 − 3 km. Our use of the full-chain prescription as opposed to physical experiments or hydrocode simulations allows us to quickly sample a wide range of parameter space appropriate to white dwarf planetary systems. Our numerical results could be used in future studies to constrain freshly-generated small debris reservoirs around white dwarfs given a particular planetary system architecture, bombardment history, and impact geometries.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Asteroids, White dwarf stars, Celestial mechanics, Protoplanetary disks | ||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||
| ISSN: | 1745-3933 | ||||||||||||||||||||||||||||||
| Official Date: | May 2020 | ||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 494 | ||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||
| Page Range: | pp. 442-457 | ||||||||||||||||||||||||||||||
| Article Number: | staa621 | ||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/staa621 | ||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Dimitri Veras, Kosuke Kurosawa, Generating metal-polluting debris in white dwarf planetary systems from small-impact crater ejecta, Monthly Notices of the Royal Astronomical Society, , staa621, is available online at: https://doi.org/10.1093/mnras/staa621 | ||||||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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