Influence of Deardorff and radiative zones on stellar dynamos

by Petri Kapyla (Goettingen University)

Tuesday 23 Nov 2021, 15:00 → 16:00 Europe/Stockholm

https://stockholmuniversity.zoom.us/j/940229961

Increasing evidence from simulations points to a possibility that deep parts of stellar convection zones are weakly stably stratified. These so-called Deardorff zones are still convective with a net outward convective flux by virtue of a non-local non-gradient contribution to the flux. The fact that Deardorff layers are subadiabatic means that it is in principle possible to store stronger magnetic fields there than in the convection zone proper. This is particularly interesting in fully convective stars where a substantial Deardorff core could form. Furthermore, the interaction of a truly stable (radiative) layer and an overlying convection zone is another aspect of interest in the study of stellar magnetism. The effects of Deardorff and radiative layers on dynamo solutions are reported from a set of new simulations using the star-in-a-box model.

PKapyla_2021-Nov-23.mp4