Evidence for nearby supernova explosions.
Evidence for nearby supernova explosions.
复制标题
附近超新星爆炸的证据。
DOI：
10.1103/physrevlett.88.081101
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发表时间：
2002
影响因子：
8.6
通讯作者：
M. Canelles
中科院分区：
文献类型：
--
作者：
N. Benı́tez;J. Máız;M. Canelles
超新星（SN）爆炸是宇宙中最具活力和潜在致命性的现象之一。我们表明，天蝎座，半人马座OB协会，一组年轻的恒星目前位于约130 pc的太阳，产生了20 SN爆炸在过去的1100万年，其中一些可能接近40 pc到我们的星球。这些爆炸产生的（60）Fe原子在地球上的沉积可以解释最近在深海地壳样品中测量到过量的这种同位素。我们认为，大约200万年前，其中一个SNe在离地球足够近的地方爆炸，严重破坏了臭氧层，引发或促成了上新世-更新世边界的海洋灭绝。
Supernova (SN) explosions are one of the most energetic---and potentially lethal---phenomena in the Universe. We show that the Scorpius-Centaurus OB association, a group of young stars currently located at approximately 130 pc from the Sun, has generated 20 SN explosions during the last 11 Myr, some of them probably as close as 40 pc to our planet. The deposition on Earth of (60)Fe atoms produced by these explosions can explain the recent measurements of an excess of this isotope in deep ocean crust samples. We propose that approximately 2 Myr ago, one of the SNe exploded close enough to Earth to seriously damage the ozone layer, provoking or contributing to the Pliocene-Pleistocene boundary marine extinction.