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The lifetimes of planetary debris discs around white dwarfs
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Heng, Kevin and Veras, Dimitri (2020) The lifetimes of planetary debris discs around white dwarfs. Monthly Notices of the Royal Astronomical Society, 496 (2). pp. 2292-2308. doi:10.1093/mnras/staa1632 ISSN 1745-3933.
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WRAP-lifetimes-planetary-debris-discs-around-white-dwarfs-Veras-2020.pdf - Accepted Version - Requires a PDF viewer. Download (2793Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/staa1632
Abstract
The lifetime of a planetary disc that orbits a white dwarf represents a crucial input parameter into evolutionary models of that system. Here we apply a purely analytical formalism to estimate lifetimes of the debris phase of these discs, before they are ground down into dust or are subject to sublimation from the white dwarf. We compute maximum lifetimes for three different types of white dwarf discs, formed from (i) radiative YORP break-up of exo-asteroids along the giant branch phases at 2–100 au, (ii) radiation-less spin-up disruption of these minor planets at ∼1.5−4.5R⊙, and (iii) tidal disruption of minor or major planets within about 1.3R⊙. We display these maximum lifetimes as a function of disc mass and extent, constituent planetesimal properties, and representative orbital excitations of eccentricity and inclination. We find that YORP discs with masses of up to 1024 kg live long enough to provide a reservoir of surviving cm-sized pebbles and m- to km-sized boulders that can be perturbed intact to white dwarfs with cooling ages of up to 10 Gyr. Debris discs formed from the spin or tidal disruption of these minor planets or major planets can survive in a steady state for up to, respectively, 1 or 0.01 Myr, although most tidal discs would leave a steady state within about 1 yr. Our results illustrate that dust-less planetesimal transit detections are plausible, and would provide particularly robust evolutionary constraints. Our formalism can easily be adapted to individual systems and future discoveries.
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): | Kuiper Belt, White dwarf stars, Astrophysics, Solar system, Asteroids | |||||||||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||||||||
Publisher: | Oxford University Press | |||||||||||||||||||||
ISSN: | 1745-3933 | |||||||||||||||||||||
Official Date: | August 2020 | |||||||||||||||||||||
Dates: |
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Volume: | 496 | |||||||||||||||||||||
Number: | 2 | |||||||||||||||||||||
Page Range: | pp. 2292-2308 | |||||||||||||||||||||
DOI: | 10.1093/mnras/staa1632 | |||||||||||||||||||||
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, Kevin Heng, The lifetimes of planetary debris discs around white dwarfs, Monthly Notices of the Royal Astronomical Society, , staa1632, is available online at: https://doi.org/10.1093/mnras/staa1632 | |||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||
Date of first compliant deposit: | 7 July 2020 | |||||||||||||||||||||
Date of first compliant Open Access: | 10 July 2020 | |||||||||||||||||||||
RIOXX Funder/Project Grant: |
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