A viewpoint on modeling stellar atmospheres and their impact on planets

Andrea Chiavassa – Lagrange, Nice

Stars exhibit intricate and stochastic patterns on their surfaces due to convective heat transport, known as granulation. Convection manifests in the surface layers as a particular pattern of downflowing cooler plasma and bright areas where hot plasma rises. Convection is a difficult process to understand, because it is non-local and three-dimensional, and it involves nonlinear interactions over many disparate length scales. Understanding this phenomenon is crucial as it directly influences stellar parameters, radial velocity, chemical abundances, photometric colors, and exoplanet characterization.  In this context, the use of numerical state-of-the-art three-dimensional (3D) radiative hydrodynamical (RHD) simulations of stellar convection is crucial. I will present how, by employing detailed and multidimensional modeling techniques for the stellar host, we gain invaluable insights into its impact on various aspects of exoplanetary atmosphere science.