Uranus' complex internal structure

This leads to significantly hotter internal temperatures that can reach a few 10^3^K and higher bulk heavy-element abundances (up to 1 Earth-mass) compared to standard adiabatic models. We find that the assumed rotation period strongly affects the inferred composition while the winds have a negligible effect. Although solutions with only H-He and rock are possible, we find that the maximum ratio in Uranus for our models ranges between 2.6 and 21.

This is water-to-rock significantly lower compared to standard adiabatic models. We conclude that it is important to include non-adiabatic regions in Uranus structure models as they significantly affect the inferred temperature profile, and therefore the inferred bulk heavy-element abundance. In addition, we suggest that it is of great value to measure Uranus' gravitational field and determine its rotation period in order to decrease the uncertainty in Uranus' bulk composition.