Interplay between differential rotation and magnetic fields in stellar radiative zones

by Laurene Jouve (Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse)

Tuesday 31 May 2022, 15:00 → 16:00 Europe/Stockholm

stockholmuniversity.zoom.us/j/940229961

I will present in this talk some recent results about the interactions between differential rotation and magnetic fields in the radiative zones of stars. I will focus in particular on the magnetism of main-sequence intermediate-mass stars which seem to exhibit a dichotomy between the strong dipolar fields of Ap/Bp stars and the sub-Gauss complex fields found recently on Vega and some other non-Ap stars. I will show some 3D numerical simulations which show that this dichotomy could come from the development (or not) of a magneto-rotationnal instability in the radiative envelope of these stars. The second topic of this talk is associated to the question of angular momentum transport in red giant stars. Recent asteroseismic observations show that an unknown very efficient extraction of angular momentum is at play in the contracting cores of red giants. I will again show some simulation results which aim at studying this transport and will propose a possible scenario for the rotational evolution of stars along the sub-giant and giant branches.

https://ui.adsabs.harvard.edu/abs/2020A%26A...641A..13J/abstract

https://ui.adsabs.harvard.edu/abs/2022arXiv220102645G/abstract

Jouve_2022-May-31.mp4