Jupiter's interior from Juno: Equation-of-state uncertainties and dilute core extent
Abstract
Context. The Juno mission has provided measurements of Jupiter's gravity field with an outstanding level of accuracy, leading to better constraints on the interior of the planet. Improving our knowledge of the internal structure of Jupiter is key to understanding its formation and evolution but is also important in the framework of exoplanet exploration. Aims. In this study, we investigated the differences between the state-of-the-art equations of state and their impact on the properties of interior models. Accounting for uncertainty on the hydrogen and helium equation of state, we assessed the span of the interior features of Jupiter. Methods. We carried out an extensive exploration of the parameter space and studied a wide range of interior models using Markov chain Monte Carlo simulations. To consider the uncertainty on the equation of state, we allowed for modifications of the equation of state in our calculations. Results. Our models harbour a dilute core and indicate that Jupiter's internal entropy is higher than what is usually assumed from the Galileo probe measurements. We obtain solutions with extended dilute cores, but contrary to other recent interior models of Jupiter, we also obtain models with small dilute cores. The dilute cores in such solutions extend to ~20% of Jupiter's mass, leading to better agreement with formation–evolution models. Conclusions. We conclude that the equations of state used in Jupiter models have a crucial effect on the inferred structure and composition. Further explorations of the behaviour of hydrogen–helium mixtures at the pressure and temperature conditions in Jupiter will help to constrain the interior of the planet, and therefore its origin.
Additional Information
© The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication. The authors thank the Juno Interior Working Group for useful discussions and comments. This research was carried out at the Observatoire de la Côte d'Azur under the sponsorship of the Centre National d'Etudes Spatiales.Attached Files
Published - aa45625-22.pdf
Files
Name | Size | Download all |
---|---|---|
md5:dee282d698dea3987edf216eee2eadfb
|
6.5 MB | Preview Download |
Additional details
- Eprint ID
- 121619
- Resolver ID
- CaltechAUTHORS:20230530-441700800.48
- Centre National d'Études Spatiales (CNES)
- Created
-
2023-06-14Created from EPrint's datestamp field
- Updated
-
2023-06-14Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences