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Ring Seismology of the Ice Giants Uranus and Neptune

A’Hearn, Joseph A. and Hedman, Matthew M. and Mankovich, Christopher R. and Aramona, Hima and Marley, Mark S. (2022) Ring Seismology of the Ice Giants Uranus and Neptune. The Planetary Science Journal, 3 (8). Art. No. 194. ISSN 2632-3338. doi:10.3847/psj/ac82bb. https://resolver.caltech.edu/CaltechAUTHORS:20220817-897413000

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Abstract

We assess the prospect of using ring seismology to probe the interiors of the ice giants Uranus and Neptune. We do this by calculating normal-mode spectra for different interior models of Uranus and Neptune using the stellar oscillation code GYRE. These spectra provide predictions of where in these planets’ ring systems the effects of interior oscillations might be detected. We find that f-mode resonances with azimuthal order m = 2 or 7 ≤ m ≤ 19 fall among the inner rings (6, 5, 4, α, and β) of Uranus, while f-mode resonances with 2 ≤ m ≤ 12 fall in the tenuous ζ ring region. In addition, f-mode resonances with m = 2 or 6 ≤ m ≤ 13 may give azimuthal structure to Neptune’s tenuous Galle ring. We also find that g-mode resonances may fall in the middle to outer rings of these planets. Although an orbiter is most likely required to confirm the association between any waves in the rings and planetary normal modes, the diversity of normal-mode spectra implies that identification of just one or two modes in the rings of Uranus or Neptune would eliminate a variety of interior models and thus aid in the interpretation of Voyager observations and future spacecraft measurements.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/PSJ/ac82bbDOIArticle
https://arxiv.org/abs/2206.05385arXivDiscussion Paper
ORCID:
AuthorORCID
A’Hearn, Joseph A.0000-0001-7522-7806
Hedman, Matthew M.0000-0002-8592-0812
Mankovich, Christopher R.0000-0002-4940-9929
Aramona, Hima0000-0002-3250-2211
Marley, Mark S.0000-0002-5251-2943
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 March 7; revised 2022 May 10; accepted 2022 May 31; published 2022 August 17. We are grateful to many individuals for useful comments and discussions, including P. Nicholson, M. Tiscareno, M. Ćuk, L. Fletcher, M. Brozović, and K. Volk. We thank two anonymous reviewers for their helpful comments that have improved this paper. We also thank NASA for the support through the Solar System Workings grants NNX15AH45G and 80NSSC21K1865.
Funders:
Funding AgencyGrant Number
NASANNX15AH45G
NASA80NSSC21K1865
Subject Keywords:Planetary rings; Orbits; Orbital resonances; Uranus; Neptune; Solar system gas giant planets; Planetary dynamics
Issue or Number:8
Classification Code:Unified Astronomy Thesaurus concepts: Planetary rings (1254); Orbits (1184); Orbital resonances (1181); Uranus (1751); Neptune (1096); Solar system gas giant planets (1191); Planetary dynamics (2173)
DOI:10.3847/psj/ac82bb
Record Number:CaltechAUTHORS:20220817-897413000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220817-897413000
Official Citation:Joseph A. A'Hearn et al 2022 Planet. Sci. J. 3 194
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116352
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:17 Aug 2022 20:36
Last Modified:17 Aug 2022 20:36

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