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Journal Articles Geophys.Res.Lett. Year : 2017

Comparing Jupiter interior structure models to Juno gravity measurements and the role of a dilute core

S.M. Wahl
  • Function : Author
W.B. Hubbard
  • Function : Author
B. Militzer
  • Function : Author
T. Guillot
Y. Miguel
  • Function : Author
N. Movshovitz
  • Function : Author
Y. Kaspi
R. Helled
  • Function : Author
E. Galanti
S. Levin
J.E. Connerney
  • Function : Author
S.J. Bolton
  • Function : Author

Abstract

The Juno spacecraft has measured Jupiter's low-order, even gravitational moments, $J_2$--$J_8$, to an unprecedented precision, providing important constraints on the density profile and core mass of the planet. Here we report on a selection of interior models based on ab initio computer simulations of hydrogen-helium mixtures. We demonstrate that a dilute core, expanded to a significant fraction of the planet's radius, is helpful in reconciling the calculated $J_n$ with Juno's observations. Although model predictions are strongly affected by the chosen equation of state, the prediction of an enrichment of $Z$ in the deep, metallic envelope over that in the shallow, molecular envelope holds. We estimate Jupiter's core to contain an 7--25 Earth mass of heavy elements. We discuss the current difficulties in reconciling measured $J_n$ with the equations of state, and with theory for formation and evolution of the planet.

Dates and versions

hal-01582420 , version 1 (06-09-2017)

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S.M. Wahl, W.B. Hubbard, B. Militzer, T. Guillot, Y. Miguel, et al.. Comparing Jupiter interior structure models to Juno gravity measurements and the role of a dilute core. Geophys.Res.Lett., 2017, 44, pp.4649-4659. ⟨10.1002/2017GL073160⟩. ⟨hal-01582420⟩
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