Frequency of Coronal Mass Ejection Impacts with Early Terrestrial Planets and Exoplanets around Active Solar-like Stars
Frequency of Coronal Mass Ejection Impacts with Early Terrestrial Planets and Exoplanets around Active Solar-like Stars
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日冕物质抛射撞击活跃类太阳恒星周围早期类地行星和系外行星的频率
DOI：
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发表时间：
2019
影响因子：
4.9
通讯作者：
O. Kochukhov
中科院分区：
文献类型：
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作者：
C. Kay;V. Airapetian;T. Lüftinger;O. Kochukhov
来自年轻的类太阳恒星的高能耀斑和相关的日冕物质抛射(CME)可以在创造大气逃逸条件以及加速粒子穿透到其大气中促进生物相关分子的形成方面发挥关键作用。我们利用0.7Gyr年轻太阳的双胞胎K1 Ceti的观测重建磁场，研究了年轻太阳磁冕中CME偏转的影响及其对早期金星、地球和火星撞击频率的影响。我们发现日冕磁场使日冕物质抛射向天体电流片偏转。这一效应表明，日冕物质抛射倾向于在黄道面附近的一个小圆锥体内传播，使日冕物质抛射的撞击频率增加到该平面附近行星磁层的撞击频率，与∼等人先前的估计相比，增加了30%或6倍。我们的模型对于早期类地行星以及年轻G-K矮星周围的类地类系外行星的生命前化学的兴起具有重要的意义。
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, k1 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.
影响因子：
7.9
作者：
Fu, Shuai;Jiang, Yong;Zank, Gary
通讯作者：
Zank, Gary