SMuK 2023 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: Planetary atmospheres

EP 4.2: Vortrag

Dienstag, 21. März 2023, 18:15–18:30, ZEU/0160

Investigation of the Influence of Stellar Particle Events and Galactic Cosmic Rays on the Atmosphere of TRAPPIST-1e — •Andreas Bartenschlager¹, Miriam Sinnhuber¹, John Lee Grenfell², Benjamin Taysum², Fabian Wunderlich², and Konstantin Herbst³ — ¹Karlsruher Institute of Technology, Germany — ²German Aerospace Center, Berlin, Germany — ³University of Kiel, Germany

The launch of the James Webb Space Telescope (JWST) in December 2021 opens up the possibility of studying the composition of exoplanetary atmospheres in habitable zones in the near future. We investigate the influence of stellar energetic particles (SEPs) on the atmospheric chemistry of exoplanets around a very active M-star TRAPPIST-1, using the ion chemistry model ExoTIC. We perform model experiments with different N₂ or CO₂ dominated atmospheres, depending on the initial CO₂ partial pressure, as well as humid and dry conditions, taking into account the ionization rates for such events. A further specification is the distinction between dead and alive atmospheres, whose atmospheric composition is characterized by a lower or higher oxygen fraction in the initial conditions. Within ExoTIC we calculate the impact of the ionization events on these atmospheres both as a single and as a series of events with different strengths. Preliminary results show a significant impact of SEP events on the chemical composition of the atmosphere, including biosignatures such as O₃. The strength of these impacts depends on the starting atmospheres’ relative oxygen, nitrogen and water vapour content.