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首页> 外文期刊>The Astrophysical Journal. Letters >Electron-capture supernovae as origin of ~(48)Ca
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Electron-capture supernovae as origin of ~(48)Ca

机译:电子捕获超新星是〜(48)Ca的起源

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摘要

We report that electron-capture supernovae (ECSNe), arising from collapsing oxygen-neon-magnesium cores, are a possible source of ~(48)Ca, whose origin has remained a longstanding puzzle. Our two-dimensional, self-consistent explosion model of an ECSN predicts ejection of neutron-rich matter with electron fractions Y e ≈ 0.40-0.42 and relatively low entropies, s ≈ 13-15 k B per nucleon (k B is the Boltzmann constant). Post-processing nucleosynthesis calculations result in appreciable production of ~(48)Ca in such neutron-rich and low-entropy matter during the quasi-nuclear equilibrium and subsequent freezeout phases. The amount of ejected ~(48)Ca can account for that in the solar inventory when we consider possible uncertainties in the entropies. ECSNe could thus be a site of ~(48)Ca production in addition to a hypothetical, rare class of high-density Type Ia supernovae.
机译:我们报告说,电子捕获超新星(ECSNe)是由坍塌的氧-氖-镁核引起的,是〜(48)Ca的可能来源,其起源一直是一个长期的难题。我们的ECSN的二维自洽爆炸模型预测,电子分数Y e≈0.40-0.42且熵相对较低,每个核子s≈13-15 k B的中子富集物质的射出(k B是玻尔兹曼常数)。核合成后的计算结果表明,在准核平衡和随后的冻结阶段,在这种富含中子和低熵的物质中,〜(48)Ca的产量可观。当我们考虑熵的可能不确定性时,〜(48)Ca的喷射量可以解释太阳能清单中的量。因此,除了假定的稀有类别的高密度Ia型超新星外,ECSNe可能是〜(48)Ca产生的场所。

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