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Post-main-sequence debris from rotation-induced YORP break-up of small bodies II : multiple fissions, internal strengths and binary production

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Veras, Dimitri and Scheeres, Daniel J (2020) Post-main-sequence debris from rotation-induced YORP break-up of small bodies II : multiple fissions, internal strengths and binary production. Monthly Notices of the Royal Astronomical Society, 492 (2). stz3565. doi:10.1093/mnras/stz3565 ISSN 1745-3933.

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Official URL: http://dx.doi.org/10.1093/mnras/stz3565

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Abstract

Over one quarter of white dwarfs contain observable metallic debris from the breakup of exo-asteroids. Understanding the physical and orbital history of this debris would enable us to self-consistently link planetary system formation and fate. One major debris reservoir is generated by YORP-induced rotational fission during the giant branch phases of stellar evolution, where the stellar luminosity can exceed the Sun’s by four orders of magnitude. Here, we determine the efficacy of the giant branch YORP effect for asteroids with nonzero internal strength, and model post-fission evolution by imposing simple analytic fragmentation prescriptions. We find that even the highest realistic internal strengths cannot prevent the widespread fragmentation of asteroids and the production of a debris field over 100 au in size. We compute the number of successive fission events as they occur in progressively smaller time intervals as the star ascends the giant branches, providing a way to generate size distributions of asteroid fragments. The results are highly insensitive to progenitor stellar mass. We also conclude that the ease with which giant branch YORP breakup can generate binary asteroid subsystems is strongly dependent on internal strength. Formed binary subsystems in turn could be short-lived due to the resulting luminosity-enhanced BYORP effect.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Kuiper Belt, Asteroids, White dwarf stars
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: February 2020
Dates:
DateEvent
February 2020Published
20 December 2019Available
12 December 2019Accepted
Volume: 492
Number: 2
Article Number: stz3565
DOI: 10.1093/mnras/stz3565
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, Daniel J Scheeres, Post-main-sequence debris from rotation-induced YORP break-up of small bodies II: multiple fissions, internal strengths and binary production, Monthly Notices of the Royal Astronomical Society, , stz3565, https://doi.org/10.1093/mnras/stz3565 is available online at: https://doi.org/10.1093/mnras/stz3565
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 9 January 2020
Date of first compliant Open Access: 17 January 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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