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Tidal circularization of gaseous planets orbiting white dwarfs
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Veras, Dimitri and Fuller, Jim (2019) Tidal circularization of gaseous planets orbiting white dwarfs. Monthly Notices of the Royal Astronomical Society, 489 (2). pp. 2941-2953. stz2339. doi:10.1093/mnras/stz2339
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WRAP-tidal-circularization-gaseous-planets-white-dwarfs-Veras-2019.pdf - Accepted Version - Requires a PDF viewer. Download (1626Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stz2339
Abstract
A gas giant planet which survives the giant branch stages of evolution at a distance of many au and then is subsequently perturbed sufficiently close to a white dwarf will experience orbital shrinkage and circularization due to star-planet tides. The circularization timescale, when combined with a known white dwarf cooling age, can place coupled constraints on the scattering epoch as well as the active tidal mechanisms. Here, we explore this coupling across the entire plausible parameter phase space by computing orbit shrinkage and potential self-disruption due to chaotic f-mode excitation and heating in planets on orbits with eccentricities near unity, followed by weakly dissipative equilibrium tides. We find that chaotic f-mode evolution activates only for orbital pericentres which are within twice the white dwarf Roche radius, and easily restructures or destroys ice giants but not gas giants. This type of internal thermal destruction provides an additional potential source of white dwarf metal pollution. Subsequent tidal evolution for the surviving planets is dominated by non-chaotic equilibrium and dynamical tides which may be well-constrained by observations of giant planets around white dwarfs at early cooling ages.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Celestial mechanics , White dwarf stars | ||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
| Publisher: | Oxford University Press | ||||||||
| ISSN: | 0035-8711 | ||||||||
| Official Date: | October 2019 | ||||||||
| Dates: |
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| Volume: | 489 | ||||||||
| Number: | 2 | ||||||||
| Page Range: | pp. 2941-2953 | ||||||||
| Article Number: | stz2339 | ||||||||
| DOI: | 10.1093/mnras/stz2339 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Publisher Statement: | 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, Jim Fuller, Tidal circularization of gaseous planets orbiting white dwarfs, Monthly Notices of the Royal Astronomical Society, , stz2339 is available online at: https://doi.org/10.1093/mnras/stz2339 | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Copyright Holders: | © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society | ||||||||
| RIOXX Funder/Project Grant: |
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