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We present numerical studies of star/planet interactions, specifically the effects of Stellar Energetic Particles (SEPs) on the atmospheres of terrestrial (exo)planets. This work was performed as part of the INCREASE project (INfluence of strong stellar particle Events and galactic Cosmic Rays on Exoplanetary AtmoSpherEs) funded by the German Research Council (DFG). We have developed and applied a new Model Suite which couples magnetospheric and atmospheric propagation and interaction models PLANETOCOSMICS (Desorgher et al. 2006) and AtRIS (Banjac et al. 2019) with the atmospheric chemistry and climate models 1D-TERRA (e.g., Wunderlich et al. 2020) and ExoTIC (Sinnhuber et al., 2012). We are able to assess the influence of the stellar activity on the planetary atmospheric structure, its chemical composition, and infer spectroscopic observables as well as the effects on biosignatures.
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Grenfell et al. (2024) studied this question.
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