André, Q, Mathis, S and Barker, AJ orcid.org/0000-0003-4397-7332 (2018) Layered semi-convection and tides in giant planet interiors. In: Proceedings of the annual meeting of the French Society of Astronomy & Astrophysics. SF2A 2017 - Annual meeting of the French Society of Astronomy & Astrophysics, 04-07 Jul 2017, Paris, France. Société Francaise d’Astronomie et d’Astrophysique , pp. 241-246.
Abstract
Layered semi-convection could operate in giant planets, potentially explaining the constraints on the heavy elements distribution in Jupiter deduced recently from juno observations, and contributing to Saturn's luminosity excess or the abnormally large radius of some hot Jupiters. This is a state consisting of density staircases, in which convective layers are separated by thin stably stratified interfaces. The efficiency of tidal dissipation in a planet depends strongly on its internal structure. It is crucial to improve our understanding of the mechanisms driving this dissipation, since it has important consequences to predict the long-term evolution of any planetary system. In this work, our goal is to study the resulting tidal dissipation when internal waves are excited by other bodies (such as the moons of giant planets) in a region of layered semi-convection. We find that the rates of tidal dissipation can be significantly enhanced in a layered semiconvective medium compared to a uniformly convective medium, especially in the astrophysically relevant sub-inertial frequency range. Thus, layered semi-convection is a possible candidate to explain high tidal dissipation rates recently observed in Jupiter and Saturn.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Keywords: | Hydrodynamics; Waves; Methods: analytical; Planets and satellites : interiors; Planets and satellites: dynamical evolution and stability; Planet-star interactions |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) |
Funding Information: | Funder Grant number Leverhulme Trust ECF-2014-216 |
Depositing User: | Symplectic Publications |
Date Deposited: | 01 Nov 2017 15:00 |
Last Modified: | 08 May 2018 15:17 |
Published Version: | http://sf2a.eu/spip/spip.php?article762 |
Status: | Published |
Publisher: | Société Francaise d’Astronomie et d’Astrophysique |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:123319 |