摘要翻译：
在过去的十年里，太阳系外行星的研究取得了巨大的进步。现在，地面和空间仪器的观测越来越复杂，系外行星的特征也越来越精确。有一类特别有趣的系外行星落在宜居带，宜居带被定义为恒星周围行星表面能够支持液态水的区域。理论计算还表明，靠近的系外行星更有可能拥有较弱的行星磁场，尤其是在超级地球的情况下。这些系外行星由于其弱磁矩而受到高通量的银河系宇宙射线（GCRs）的影响。GCRs是天体物理起源的高能粒子，它撞击行星大气并产生次级粒子，包括μ子，这些粒子具有高度的穿透性。这些粒子中的一些到达行星表面，并对辐射剂量做出贡献。除了磁场，另一个控制辐射剂量的因素是行星大气的深度。行星大气的深度越高，表面次级粒子的通量就会越低。如果次级粒子的能量足够大，其通量也足够高，那么μ子的辐射也可以影响到亚表面区域，比如火星。如果辐射剂量过高，地球上维持长期生物圈的机会就很低。我们探讨了GCR引起的辐射剂量与行星磁场强度及其大气深度的关系，发现后者是保护行星生物圈的决定性因素。
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英文标题：
《Galactic cosmic ray induced radiation dose on terrestrial exoplanets》
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作者：
Dimitra Atri, B. Hariharan, Jean-Mathias Griessmeier
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最新提交年份：
2013
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分类信息：

一级分类：Physics        物理学
二级分类：High Energy Astrophysical Phenomena        高能天体物理现象
分类描述：Cosmic ray production, acceleration, propagation, detection. Gamma ray astronomy and bursts, X-rays, charged particles, supernovae and other explosive phenomena, stellar remnants and accretion systems, jets, microquasars, neutron stars, pulsars, black holes
宇宙线产生，加速，传播，探测。伽马射线天文学和爆发，X射线，带电粒子，超新星和其他爆炸现象，恒星遗迹和吸积系统，喷流，微类星体，中子星，脉冲星，黑洞
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一级分类：Physics        物理学
二级分类：Earth and Planetary Astrophysics        地球和行星天体物理学
分类描述：Interplanetary medium, planetary physics, planetary astrobiology, extrasolar planets, comets, asteroids, meteorites. Structure and formation of the solar system
行星际介质，行星物理学，行星天体生物学，太阳系外行星，彗星，小行星，陨石。太阳系的结构和形成
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一级分类：Quantitative Biology        数量生物学
二级分类：Other Quantitative Biology        其他定量生物学
分类描述：Work in quantitative biology that does not fit into the other q-bio classifications
不适合其他q-bio分类的定量生物学工作
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英文摘要：
  This past decade has seen tremendous advancements in the study of extrasolar planets. Observations are now made with increasing sophistication from both ground and space-based instruments, and exoplanets are characterized with increasing precision. There is a class of particularly interesting exoplanets, falling in the habitable zone, which is defined as the area around a star where the planet is capable of supporting liquid water on its surface. Theoretical calculations also suggest that close-in exoplanets are more likely to have weaker planetary magnetic fields, especially in case of super earths. Such exoplanets are subjected to a high flux of Galactic Cosmic Rays (GCRs) due to their weak magnetic moments. GCRs are energetic particles of astrophysical origin, which strike the planetary atmosphere and produce secondary particles, including muons, which are highly penetrating. Some of these particles reach the planetary surface and contribute to the radiation dose. Along with the magnetic field, another factor governing the radiation dose is the depth of the planetary atmosphere. The higher the depth of the planetary atmosphere, the lower the flux of secondary particles will be on the surface. If the secondary particles are energetic enough, and their flux is sufficiently high, the radiation from muons can also impact the sub-surface regions, such as in the case of Mars. If the radiation dose is too high, the chances of sustaining a long-term biosphere on the planet are very low. We explore the dependence of the GCR induced radiation dose on the strength of the planetary magnetic field and its atmospheric depth, finding that the latter is the decisive factor for the protection of a planetary biosphere.
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PDF链接：
https://arxiv.org/pdf/1307.4704