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Speeding past planets? Asteroids radiatively propelled by giant branch Yarkovsky effects
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Veras, Dimitri, Higuchi, Arika and Ida, Shigeru (2019) Speeding past planets? Asteroids radiatively propelled by giant branch Yarkovsky effects. Monthly Notices of the Royal Astronomical Society, 485 (1). pp. 708-724. doi:10.1093/mnras/stz421 ISSN 0035-8711.
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Official URL: https://doi.org/10.1093/mnras/stz421
Abstract
Understanding the fate of planetary systems through white dwarfs which accrete debris crucially relies on tracing the orbital and physical properties of exo-asteroids during the giant branch phase of stellar evolution. Giant branch luminosities exceed the Sun’s by over three orders of magnitude, leading to significantly enhanced Yarkovsky and YORP effects on minor planets. Here, we place bounds on Yarkovsky-induced differential migration between asteroids and planets during giant branch mass loss by modelling gone exo-Neptune with inner and outer exo-Kuiper belts. In our bounding models, the asteroids move too quickly past the planet to be diverted from their eventual fate, which can range from: (i) populating the outer regions of systems out to 104−105au, (ii) being engulfed within the host star, or (iii) experiencing Yarkovsky-induced orbital inclination flipping without any Yarkovsky-induced semimajor axis drift. In these violent limiting cases, temporary resonant trapping of asteroids with radii of under about 10 km by the planet is insignificant, and capture within the planet’s Hill sphere requires fine-tuned dissipation. The wide variety of outcomes presented here demonstrates the need to employ sophisticated structure and radiative exo-asteroid models in future studies. Determining where metal-polluting asteroids reside a round a white dwarf depends on understanding extreme Yarkovsky physics.
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): | Asteroids, White dwarf stars, Celestial mechanics, Protoplanetary disks | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 0035-8711 | ||||||||
Official Date: | May 2019 | ||||||||
Dates: |
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Volume: | 485 | ||||||||
Number: | 1 | ||||||||
Page Range: | pp. 708-724 | ||||||||
DOI: | 10.1093/mnras/stz421 | ||||||||
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 [insert complete citation information here] is available online at: xxxxxxx [insert URL and DOI of the article on the OUP website]. | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 13 February 2019 | ||||||||
Date of first compliant Open Access: | 13 February 2019 | ||||||||
RIOXX Funder/Project Grant: |
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