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

Author:

Militzer BurkhardORCID,Hubbard William B.ORCID,Wahl SeanORCID,Lunine Jonathan I.ORCID,Galanti EliORCID,Kaspi Yohai,Miguel Yamila,Guillot TristanORCID,Moore Kimberly M.ORCID,Parisi MarziaORCID,Connerney John E. P.,Helled RavidORCID,Cao HaoORCID,Mankovich ChristopherORCID,Stevenson David J.ORCID,Park Ryan S.ORCID,Wong Mike,Atreya Sushil K.,Anderson John,Bolton Scott J.

Abstract

Abstract 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.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Geophysics,Astronomy and Astrophysics

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