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EP: Fachverband Extraterrestrische Physik

EP 9: Astrophysics I

EP 9.2: Talk

Friday, September 3, 2021, 11:30–11:45, H5

From Starspots to Stellar Coronal Mass Ejections - Revisiting Empirical Stellar Relations — •Konstantin Herbst¹, Athanasios Papaioannou², Vladimir Airapetian^{3, 4}, and Dimitra Atri⁵ — ¹IEAP, Christan-Albrechts-Universität zu Kiel, Leibnizstr. 11, 24118 Kiel, Germany — ²IAASARS, National Observatory of Athens, I. Metaxa & Vas. Pavlou St., 15236 Penteli, Greece — ³NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA — ⁴American University, 4400 Massachusetts Ave NW, Washington, DC 20016, USA — ⁵Center for Space Science, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, UAE

Upcoming missions, including the James Webb Space Telescope, will soon characterize the atmospheres of terrestrial-type exoplanets in habitable zones around cool K- and M-type stars by searching for atmospheric biosignatures. Recent observations suggest that the ionizing radiation and particle environment from active cool planet hosts may be detrimental to exoplanetary habitability. Since no direct information on the radiation field is available, empirical relations between signatures of stellar activity, including the sizes and magnetic fields of starspots, are often used. Here, we revisit the empirical relation between the starspot size and the effective stellar temperature and evaluate its impact on estimates of stellar flare energies, coronal mass ejections, and fluxes of the associated stellar energetic particle events.