Speaker
Description
While we know with great detail the magnetic field of Jupiter and several works have successfully reproduced several features, including the atmospheric winds, the only studies for giant exoplanet magnetism rely on scaling laws. We present a novel approach, as shown in Elias-López et al. 2025, A&A, 696: we run 3D dynamo simulations (solving the anelastic MHD equations with MagIC) with the thermodynamical background properties related to different ages of cold Jupiters, as provided by the MESA evolutionary code. We explore different masses and dynamo numbers and get detailed solutions, being able to study the expected configuration, besides the average surface intensity. Our results on one side recover the slow decay of the average magnetic field predicted by convective flux-based scaling laws, on the other side shows an interesting transition, likely at early ages, from multipolar-dominated dynamo solutions to a dipolar-dominated ones. This has potential implications for the expected Jovian-like coherent radio emission which could be detectable by SKA-low for the closest systems.
