Göttingen 2025 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 10: Poster Session

EP 10.9: Poster

Donnerstag, 3. April 2025, 11:00–12:30, ZHG Foyer 1. OG

Stellar activity in the solar system and beyond: Earth as an exoplanet — •Alexander Siebelts — Karlsruher Institut für Technologie(KIT)

With their increasing number of discoveries, research in the habitability of exoplanets becomes an increasing topic of interest. In several cases, atmospheres on exoplanets have already been detected. Even if we assume that an Earth-like atmosphere is present on an exoplanet in the habitable zone around its host star, the orbital and stellar conditions it lives in have a profound effect on the climatological conditions of its atmospheres, the weather, and ultimately the habitability. In the scope of a Master's thesis, several experiments have been conducted to research the effect that changes on orbital parameters have on the climatological conditions on such an exoplanet. With the climate model ICON, simulations of Earth have been done as an Earth-like exoplanet. In a first step, the research included the adaptation of the solar spectrum, the topography and composition of its surface and the magnetic field, but was later limited to the obliquity and eccentricity of the planet's orbit, the distance and solar intensity simulated by the solar constant, and the angular velocity of the planet. The model simulations provide insight into the changes in the atmospheric dynamic and climatology under extreme conditions. While the changes made to the obliquity show a more realistic transformation of the extent of Earth's seasons, the changes made to the angular velocity provide unrealistic results. The effect of all parameters is heavily outweighed by the changes made to the solar constant.

Keywords: ICON; Climate modelling; Exoplanets