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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 ISSN 1745-3933.

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Official URL: http://dx.doi.org/10.1093/mnras/staa243

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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
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > 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:
DateEvent
March 2020Published
3 February 2020Available
17 January 2020Accepted
Volume: 492
Number: 4
Page Range: pp. 5291-5296
DOI: 10.1093/mnras/staa243
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, 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
Date of first compliant deposit: 11 February 2020
Date of first compliant Open Access: 24 February 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/P003850/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
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