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Frequency of Coronal Mass Ejection Impacts with Early Terrestrial Planets and Exoplanets around Active Solar-like Stars
NASA, GSFC, SEEC, Greenbelt, MD 20771 USA;Catholic Univ Amer, Washington, DC 20064 USA.
NASA, GSFC, SEEC, Greenbelt, MD 20771 USA;Amer Univ, Washington, DC 20016 USA.
Univ Vienna, Vienna, Austria.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.ORCID iD: 0000-0003-3061-4591
2019 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 886, no 2, article id L37Article in journal (Refereed) Published
Abstract [en]

Energetic flares and associated coronal mass ejections (CMEs) from young magnetically active solar-like stars can play a critical role in setting conditions for atmospheric escape as well as penetration of accelerated particles into their atmospheres that promotes formation of biologically relevant molecules. We have used the observationally reconstructed magnetic field of the 0.7 Gyr young Sun?s twin, k(1) Ceti, to study the effects of CME deflections in the magnetic corona of the young Sun and their effects on the impact frequency on the early Venus, Earth, and Mars. We find that the coronal magnetic field deflects the CMEs toward the astrospheric current sheet. This effect suggests that CMEs tend to propagate within a small cone about the ecliptic plane increasing the impact frequency of CMEs with planetary magnetospheres near this plane to ?30% or by a factor of 6 as compared to previous estimate by Airapetian et al. Our model has important implications for the rise of prebiotic chemistry on early terrestrial planets as well as terrestrial-type exoplanets around young G-K dwarfs.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 886, no 2, article id L37
Keywords [en]
Solar analogs, Magnetic fields, Stellar coronae, Stellar coronal mass ejections, Exoplanet astronomy, Earth (planet), Magnetic variable stars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-400013DOI: 10.3847/2041-8213/ab551fISI: 000499349000001OAI: oai:DiVA.org:uu-400013DiVA, id: diva2:1380770
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19Bibliographically approved

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