We compute realistic 3D radiative MHD near-surface models of starspots with substantial penumbrae on cool main-sequence stars using the MURaM simulation code. This work is an improvement on the the previous starspot models in a slab geometry. The umbra, penumbra and the quiet star for all starspots are distinct, not only in intensity and temperature, but also in thermodynamic and velocity structure. These models represent a significant step towards modelling contribution of starspots to stellar lightcurves.
@article{arxiv.2412.16921,
title = {3D Radiative MHD Simulations of Starspots II: Large-scale Structure},
author = {Tanayveer Singh Bhatia and Mayukh Panja and Robert Cameron and Sami Solanki},
journal= {arXiv preprint arXiv:2412.16921},
year = {2025}
}
Comments
8 pages, 6 figures, accepted for publication in A&A