Juno Spacecraft Measurements of Jupiter's Gravity Imply a Dilute Core

Burkhard Militzer , William B. Hubbard , Sean Wahl , Jonathan I. Lunine , Eli Galanti , Yohai Kaspi , Yamila Miguel , Tristan Guillot (1) , Kimberly M. Moore , Marzia Parisi , John E. P. Connerney , Ravid Helled , Hao Cao , Christopher Mankovich , David J. Stevenson , Ryan S. Park , Mike Wong , Sushil K. Atreya , John Anderson , Scott J. Bolton

1 LAGRANGE - Joseph Louis LAGRANGE

The Juno spacecraft measured Jupiter's gravity field and determined the even and odd zonal harmonics, J _n , with unprecedented precision. However, interpreting these observations has been a challenge because it is difficult to reconcile the unexpectedly small magnitudes of the moments J ₄ and J ₆ with conventional interior models that assume a large, distinct core of rock and ice. Here we show that the entire set of gravity harmonics can be matched with models that assume an ab initio equation of state, wind profiles, and a dilute core of heavy elements that are distributed as far out as 63% of the planet's radius. In the core region, heavy elements are predicted to be distributed uniformly and make up only 18% by mass because of dilution with hydrogen and helium. Our models are consistent with the existence of primary and secondary dynamo layers that will help explain the complexity of the observed magnetic field.

Mots clés: Solar system gas giant planets

Domaines: Planète et Univers [physics]; Astrophysique [astro-ph]

Burkhard Militzer, William B. Hubbard, Sean Wahl, Jonathan I. Lunine, Eli Galanti, et al.. Juno Spacecraft Measurements of Jupiter's Gravity Imply a Dilute Core. The Planetary Science Journal, 2022, 3, ⟨10.3847/PSJ/ac7ec8⟩. ⟨insu-03869585⟩