[A-OS14] 陸域海洋相互作用ー惑星スケールの物質輸送

[AOS14-01] Magnetic Lives of Young Solar-Like Stars and The Impact of Exoplanets

★Invited Papers

*Vladimir Airapetian¹、K. France²、M. Gudel³、M. Jin⁴、J. Hu⁵、T. Lüftinger⁶、S. Boro-Saikia³、D. Soderblom⁷ (1.NASA Goddard Space Flight Center、2.University of Colorado, Boulder, CO, USA、3.University of Vienna, Austria、4.Lockheed Martin Research Corporation, CA, USA、5.NASA/Goddard Space Flight Center/SEEC, Greenbelt, MD, USA、6.European Space Agency, ESTEC, Noordwijk, NL、7.Space Telescope Science Institute, MD, USA)

キーワード：Exoplanets, CMEs, SEPs, CFHT, young rocky exoplanets

Discovery of over 5000 exoplanets in our Galaxy suggests that rocky exoplanets in the habitable zones around young magnetically active G and K dwarfs should be exposed to high stellar coronal X-ray and Extreme UV (EUV) and wind mass fluxes. Kepler and TESS missions have revealed frequent superflares on cool solar-like planet hosting stars, providing a mechanism by which host stars may have profound effects on the physical and chemical evolution of exoplanetary atmospheres. Solar observations indicate that energetic flares are usually accompanied by ejection of coronal magnetized plasma referred to as coronal mass ejections or CMEs. As CMEs propagate out from the solar corona into interplanetary space, they drive shocks. Shocks are the sites of efficient acceleration of solar energetic particles (SEPs) to GeV energies. SEPs can penetrate (exo)planetary atmospheres and cause significant changes in atmospheric chemistry. While stellar superflares can be directly observed and characterized in X-ray, FUV/UV, optical and radio bands, the signatures of their CME and SEP counterparts remain elusive and need detail theoretical modeling. Here, I will describe our recent multi-observatory international project "Magnetic Lives of Young Suns" that coordinates HST-XMM-Newton, TESS, NICER and ground-based observations taken with CFHT observations of young (0.1-0.6 Gyr) solar-like (G and K type) dwarfs. These data provide critical inputs to the data-constrained three-dimensional (3D) fully thermodynamic magnetohydrodynamic (MHD) models of coronae, and winds from young solar-like stars. I will then present recent results of data-constrained 3D MHD models of superlares and CMEs from young solar-like stars coupled to the kinetic models of SEP events, the crucial factor for understanding of the rise of the feedstock molecules of life on early Venus, Earth Mars and young rocky exoplanets.