Andreas Christ Sølvsten Jørgensen

In my research, I investigate how an improved understading of magneto-hydrodynamic (MHD) processes in stars can help to shed light on stellar structures and their evolution. For this purpose, I develop upon the depiction of turbulent convection and mixing processes in one-dimensional (1D) stellar models, using multi-dimensional simulations of stellar envelopes and of overshooting. Building upon these improvements of stellar models, I investigate low-mass stars, such as the present Sun and stars in the Kepler field, using helio- and asteroseismology. From these analyses, I seek to derive more accurate estimates of stellar properties.

The improved depiction of the surface layers in our evolution code (Garstec) reliably recovers the results from realistic 3D simulations (cf. Jørgensen et al. 2018).

We are able to interpolate robustly in 3D simulations, due to their homology (cf. Jørgensen et al. 2017).

Using 3D simulations, we can address and correct for the surface effect (e.g. Jørgensen et al. 2019).

Using multi-dimensional simulations of convection, we can address the tachocline anomaly and the lithium depletion problem (cf. Jørgensen & Weiss 2018).

Our improved models can be used to discuss surface correction relations (cf. Jørgensen et al. 2019).

Coupling of the Stagger grid and the Garching stellar evolution code (Garstec): We include realistic stellar envelopes at every time-step of the computed evolution (cf. Jørgensen et al. 2018).