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The post-main-sequence fate of the HR 8799 planetary system
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Veras, Dimitri and Hinkley, Sasha (2021) The post-main-sequence fate of the HR 8799 planetary system. Monthly Notices of the Royal Astronomical Society, 505 (2). pp. 1557-1566. doi:10.1093/mnras/stab1311 ISSN 1365-2966.
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WRAP-post-main-sequence-fate-HR-8799-planetary-2021.pdf - Accepted Version - Requires a PDF viewer. Download (2193Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stab1311
Abstract
The noteworthy four-planet HR 8799 system teeters on the brink of gravitational instability and contains an A-type host star which is characteristic of the progenitors of the majority of known white dwarf planetary system hosts. Goździewski & Migaszewski (2020) have demonstrated that the system can retain all four planets for at least 1 Gyr along the main sequence if the planets evolve within an externally unperturbed 8:4:2:1 mean motion resonance configuration. Here we propagate forward their most stable fit beyond the main sequence, and incorporate external effects from Galactic tides and stellar flybys. We find that (i) giant branch mass loss always breaks the resonance, and usually triggers the ejection of two of the planets, (ii) stellar flybys and Galactic tides rarely break the resonance during the main-sequence and giant branch phases, but play a crucial role in determining the final planetary configurations around the eventual white dwarf host star, and (iii) the meanderings of the surviving planets vary significantly, occupying regions from under 1 au to thousands of au. The ubiquitous survival of at least one planet and the presence of the debris discs in the system should allow for dynamical pathways for the white dwarf to be metal-polluted.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Library of Congress Subject Headings (LCSH): | Stars -- Evolution, White dwarf stars , Protoplanetary disks , Planets -- Atmospheres | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press (OUP) | ||||||||
ISSN: | 1365-2966 | ||||||||
Official Date: | August 2021 | ||||||||
Dates: |
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Volume: | 505 | ||||||||
Number: | 2 | ||||||||
Page Range: | pp. 1557-1566 | ||||||||
DOI: | 10.1093/mnras/stab1311 | ||||||||
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, Sasha Hinkley, The post-main-sequence fate of the HR 8799 planetary system, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 2, August 2021, Pages 1557–1566, is available online at: https://doi.org/10.1093/mnras/stab1311 | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Copyright Holders: | © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society | ||||||||
Date of first compliant deposit: | 17 June 2021 | ||||||||
Date of first compliant Open Access: | 18 June 2021 | ||||||||
RIOXX Funder/Project Grant: |
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