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arXiv 1203.0616astro-ph.SR
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磁旋转驱动的超新星作为早期星系$r$ -过程元素的起源?

Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?

Christian Winteler, Roger Kaeppeli, Albino Perego, Almudena Arcones, Nicolas Vasset, Nobuya Nishimura, Matthias Liebendoerfer, Friedrich-Karl Thielemann

摘要:

我们研究磁旋转驱动的超新星源的$r$过程中的元素在早期的银河系。基于中微子输运近似下的三维磁流体动力学核塌缩超新星模型中示踪粒子的热力学历史,在考虑和不考虑中微子吸收反应对后处理过程中电子分数($Y_{e}$)的影响的情况下,进行了核合成计算.我们发现由于中微子的吸收,喷出物中$Y_{e}$的峰分布由$\sim0.15$向$\sim0.17$移动,并向高$Y_{e}$方向展宽。然而,在这两种情况下,太阳能$r$过程元素分布的第二和第三峰值可以很好地再现。这里使用的罕见的祖先配置,其特点是高旋转速率和大磁场的双极喷流的形成所必需的,自然可以提供一个网站的强$r$ -过程与早期银河系化学演化的观察。

英文摘要:

We examine magnetorotationally driven supernovae as sources of $r$-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a three-dimensional magnetohydrodynamical core-collapse supernova model with approximated neutrino transport, we perform nucleosynthesis calculations with and without considering the effects of neutrino absorption reactions on the electron fraction ($Y_{e}$) during post-processing. We find that the peak distribution of $Y_{e}$ in the ejecta is shifted from $\sim0.15$ to $\sim0.17$ and broadened toward higher $Y_{e}$ due to neutrino absorption. Nevertheless, in both cases the second and third peaks of the solar $r$-process element distribution can be well reproduced. The rare progenitor configuration that was used here, characterized by a high rotation rate and a large magnetic field necessary for the formation of bipolar jets, could naturally provide a site for the strong $r$-process in agreement with observations of the early galactic chemical evolution.

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