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Constraining the origin of the planetary debris surrounding ZTF J0139+5245 through rotational fission of a triaxial asteroid
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Veras, Dimitri, McDonald, Catriona H. and Makarov, Valeri V. (2020) Constraining the origin of the planetary debris surrounding ZTF J0139+5245 through rotational fission of a triaxial asteroid. Monthly Notices of the Royal Astronomical Society, 492 (4). pp. 5291-5296. doi:10.1093/mnras/staa243
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WRAP-constraining-origin-planetary-debris-surrounding-ZTF-J0139+5245-through-rotational-fission-triaxial-asteroid-Veras-2020.pdf - Accepted Version - Requires a PDF viewer. Download (1174Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/staa243
Abstract
White dwarfs containing orbiting planetesimals or their debris represent crucial benchmarks by which theoretical investigations of post-main-sequence planetary systems may be calibrated. The photometric transit signatures of likely planetary debris in the ZTF J0139+5245 white dwarf system have an orbital period of about 110 d. An asteroid which breaks up to produce this debris may spin itself to destruction through repeated close encounters with the star without entering its Roche radius and without influence from the white dwarf’s luminosity. Here, we place coupled constraints on the orbital pericentre (q) and the ratio (β) of the middle to longest semiaxes of a triaxial asteroid which disrupts outside of this white dwarf’s Roche radius (rRoche) soon after attaining its 110-d orbit. We find that disruption within tens of years is likely when β ≲ 0.6 and q ≈ 1.0–2.0rRoche, and when β ≲ 0.2 out to q ≈ 2.5rRoche. Analysing the longer time-scale disruption of triaxial asteroids around ZTF J0139+5245 is desirable but may require either an analytical approach relying on ergodic theory or novel numerical techniques.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Asteroids -- Orbits, Astrophysics, Planets | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 1745-3933 | ||||||||
| Official Date: | March 2020 | ||||||||
| Dates: |
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| Volume: | 492 | ||||||||
| Number: | 4 | ||||||||
| Page Range: | pp. 5291-5296 | ||||||||
| DOI: | 10.1093/mnras/staa243 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Publisher Statement: | 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, Catriona H McDonald, Valeri V Makarov, Constraining the origin of the planetary debris surrounding ZTF J0139+5245 through rotational fission of a triaxial asteroid, Monthly Notices of the Royal Astronomical Society, , staa243, https://doi.org/10.1093/mnras/staa243 is available online at: https://doi.org/10.1093/mnras/staa243 | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| RIOXX Funder/Project Grant: |
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