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arXiv 1302.0929astro-ph.SR
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捕获电子的超新星是48 Ca的起源

Electron-capture supernovae as origin of 48Ca

Shinya Wanajo, Hans-Thomas Janka, Bernhard Mueller

摘要:

我们报告说,电子捕获超新星(ECSNe),产生于崩溃的氧-氖-镁核心,是一个可能的来源48钙,其起源一直是一个长期的谜。我们的ECSN的二维自洽爆炸模型预测了富中子物质的喷射,电子分数Ye = 0.40-0.42,熵相对较低,每个核子s = 13-15 kB(kB是玻耳兹曼常量)。后处理核合成计算结果在可观的生产48钙在这样的中子丰富和低熵的物质在准核平衡和随后的冻结阶段。当我们考虑熵或喷射质量分布中可能的不确定性时,喷射的48 Ca的量可以解释太阳存量中的48 Ca。因此,ECSNe可能是一个48 Ca生产的网站,除了一个假设的,罕见的高密度Ia型超新星。

英文摘要:

We report that electron-capture supernovae (ECSNe), arising from collapsing oxygen-neon-magnesium cores, are a possible source of 48Ca, whose origin has remained a long-standing puzzle. Our two-dimensional, self-consistent explosion model of an ECSN predicts ejection of neutron-rich matter with electron fractions Ye = 0.40-0.42 and relatively low entropies, s = 13-15 kB per nucleon (kB is the Boltzmann constant). Post-processing nucleosynthesis calculations result in appreciable production of 48Ca in such neutron-rich and low-entropy matter during the quasi-nuclear equilibrium and subsequent freezeout phases. The amount of ejected 48Ca can account for that in the solar inventory when we consider possible uncertainties in the entropies or ejecta-mass distribution. ECSNe could thus be a site of 48Ca production in addition to a hypothetical, rare class of high-density Type Ia supernovae.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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