Sharp Rise in Cosmic Ray Irradiation of Organisms on Earth Caused by a Nearby SN Shockwave Passage.

IF 3.5 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Astrobiology Pub Date : 2024-06-01 Epub Date: 2024-05-07 DOI:10.1089/ast.2023.0126

A A Shchepkin, G I Vasilyev, V M Ostryakov, A K Pavlov

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引用次数: 0

Abstract

The work considers the modelling of nearby supernova (SN) effects on Earth's biosphere via cosmic rays (CRs) accelerated by shockwaves. The rise of the radiation background on Earth resulted from the external irradiation by CR high-energy particles and internal radiation in organisms by the decay of cosmogenic ¹⁴C is evaluated. We have taken into account that the CR flux near Earth goes up steeply when the shockwave crosses the Solar System, while in previous works the CR transport was considered as purely diffusive. Our simulations demonstrate a high rise of the external ionization of the environments at Earth's surface by atmospheric cascade particles that penetrate the first 70-100 m of water depth. Also, the cosmogenic ¹⁴C decay is able to irradiate the entire biosphere and deep ocean organisms. We analyzed the probable increase in mutation rate and estimated the distance between Earth and an SN, where the lethal effects of irradiation are possible. Our simulations demonstrate that for SN energy of around 10⁵¹ erg the lethal distance could be ∼18 pc.

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邻近 SN 冲击波通道导致地球上生物体受到的宇宙射线辐照急剧增加。

该研究考虑了附近超新星（SN）通过冲击波加速的宇宙射线（CRs）对地球生物圈的影响建模。我们评估了 CR 高能粒子的外部辐照和宇宙源 14C 的衰变对生物体内部辐射造成的地球辐射本底的上升。我们考虑到，当冲击波穿过太阳系时，地球附近的 CR 通量会急剧上升，而在以前的研究中，CR 的传输被认为是纯扩散的。我们的模拟结果表明，大气层中的级联粒子在地球表面环境中的外部电离程度很高，这些粒子穿透了水深的前 70-100 米。此外，宇宙源 14C 衰变能够辐照整个生物圈和深海生物。我们分析了突变率可能增加的情况，并估算了地球与 SN 之间的距离，在这个距离上，辐照可能产生致命影响。我们的模拟结果表明，当SN能量约为1051尔格时，致命距离可达18 pc。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrobiology 生物-地球科学综合

CiteScore

7.70

自引率

11.90%

发文量

100

审稿时长

3 months

期刊介绍： Astrobiology is the most-cited peer-reviewed journal dedicated to the understanding of life''s origin, evolution, and distribution in the universe, with a focus on new findings and discoveries from interplanetary exploration and laboratory research. Astrobiology coverage includes: Astrophysics; Astropaleontology; Astroplanets; Bioastronomy; Cosmochemistry; Ecogenomics; Exobiology; Extremophiles; Geomicrobiology; Gravitational biology; Life detection technology; Meteoritics; Planetary geoscience; Planetary protection; Prebiotic chemistry; Space exploration technology; Terraforming