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Energetic flares and associated coronal mass ejections (CMEs) from youngmagnetically active solar-like stars can play a critical role in settingconditions for atmospheric escape as well aspenetration of acceleratedparticles into their atmospheres that promotes formation of biologicallyrelevant molecules. We have used the observationally reconstructed magneticfield of the 0.7 Gyr-young Suns twin, k1 Ceti, to study the effects of CMEdeflections in the magnetic corona of the young Sun and their effects on theimpact frequency on the early Venus, Earth and Mars. We find that the coronalmagnetic field deflects the CMEs toward the astrospheric current sheet (ACS).This effect suggests that CMEs tend to propagate within a small cone about theecliptic plane increasing the impact frequency of CMEs with planetarymagnetospheres near this plane to ~ 30 percent or by a factor of 6 as comparedto previous estimate by Airapetian et al. 2016. Our model has importantimplications for the rise of prebiotic chemistry on early terrestrial planetsas well as terrestrial type exoplanets around young G-K dwarfs.

Frequency of Coronal Mass Ejection Impacts with Early Terrestrial Planets and Exoplanets Around Active Solar-like Stars