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arXiv 1802.00737astro-ph.HEastro-ph.SR
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中微子驱动的超新星喷出物核合成的天体物理条件综述

Survey of astrophysical conditions in neutrino-driven supernova ejecta nucleosynthesis

Julia Bliss, Maximilian Witt, Almudena Arcones, Fernando Montes, Jorge Pereira

摘要:

核心坍缩超新星产生的元素介于Fe和Ag之间,这取决于喷出物质的性质。尽管近几十年来超新星模拟取得了快速进展,但天体物理条件仍然存在不确定性。本文研究了天体物理不确定性对核合成的影响。由于基于水动力学模拟轨迹的系统研究在计算上非常昂贵,因此我们依赖于稳态模型。通过改变原中子星的质量和半径以及稳态模型中的电子分数,我们涵盖了广泛的天体物理条件。在我们的研究中,我们发现四个丰度模式,可以形成在富中子中微子驱动的喷出物。这提供了一个独特的轨迹模板,可用于研究核物理输入对代表性天体物理条件的核合成的影响。此外,我们将这四种模式与$T=3$ ~GK的中子-种子和α-种子比联系起来。因此,我们的研究结果给出了一个很好的概述潜在的核合成演化,可以发生在超新星模拟。

英文摘要:

Core-collapse supernovae produce elements between Fe and Ag depending on the properties of the ejected matter. Despite the fast progress in supernova simulations in the last decades, there are still uncertainties in the astrophysical conditions. In this paper we investigate the impact of astrophysical uncertainties on the nucleosynthesis. Since a systematic study based on trajectories from hydrodynamic simulations is computationally very expensive, we rely on a steady-state model. By varying the mass and radius of the proto-neutron star as well as electron fraction in the steady-state model, we cover a wide range of astrophysical conditions. In our study, we find four abundance patterns which can be formed in neutron-rich neutrino-driven ejecta. This provides a unique template of trajectories that can be used to investigate the impact of nuclear physics input on the nucleosynthesis for representative astrophysical conditions. Furthermore, we link these four patterns to the neutron-to-seed and alpha-to-seed ratios at $T=3$~GK. Therefore, our results give a good overview of the potential nucleosynthesis evolution which can occur in a supernova simulation.

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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