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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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Official URL: https://doi.org/10.1093/mnras/stz2339

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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
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:
DateEvent
October 2019Published
26 August 2019Available
21 August 2019Accepted
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:
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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