Europlanet Science Congress 2022
Palacio de Congresos de Granada, Spain
18 – 23 September 2022
Europlanet Science Congress 2022
Palacio de Congresos de Granada, Spain
18 September – 23 September 2022
EPSC Abstracts
Vol. 16, EPSC2022-56, 2022, updated on 30 Apr 2024
https://doi.org/10.5194/epsc2022-56
Europlanet Science Congress 2022
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Empirical Structure Models of Uranus and Neptune

Benno Neuenschwander and Ravit Helled
Benno Neuenschwander and Ravit Helled
  • University of Zurich, Institute for Computational Science, Zurich, Switzerland

Uranus and Neptune are still poorly understood. Their gravitational fields, rotation periods, atmosphere dynamics, and internal structures are not well determined. In this paper, we present empirical structure models of Uranus and Neptune where the density profiles are represented by polytropes. By using these models that are set to fit the planetary gravity field, we predict the higher order gravitational coefficients J6 and J8 for various assumed rotation periods, wind depths, and uncertainty of the low-order harmonics. We show that faster rotation and/or deep winds favour centrally concentrated density distributions. We demonstrate that an accurate determination of J6 or J8 with a relative uncertainty no larger than 10% could constrain wind depths of Uranus and Neptune. We also confirm that the Voyager II rotation periods are inconsistent with the measured shapes of Uranus and Neptune. We next demonstrate that more accurate determination of the gravity field can significantly reduce the possible range of internal structures. Finally, we suggest that an accurate measurement of the moment of inertia of Uranus and Neptune with a relative uncertainty of ∼1% and ∼0.1%, could constrain their rotation periods and depths of the winds, respectively.

How to cite: Neuenschwander, B. and Helled, R.: Empirical Structure Models of Uranus and Neptune, Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-56, https://doi.org/10.5194/epsc2022-56, 2022.

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