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Published August 2022 | Published + Submitted
Journal Article Open

Ring Seismology of the Ice Giants Uranus and Neptune

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.

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.

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Published - AHearn_2022_Planet_Sci_J_3_194.pdf

Submitted - 2206-05385.pdf

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Additional details

Created:
October 9, 2023
Modified:
October 24, 2023