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arXiv 1503.02199astro-ph.HEastro-ph.SR
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大质量恒星核坍缩的三维演化

The Three Dimensional Evolution to Core Collapse of a Massive Star

Sean M. Couch, Emmanouil Chatzopoulos, W. David Arnett, F. X. Timmes

摘要:

我们提出了第一个三维(3D)模拟的最后几分钟的铁核心增长在一个大质量的恒星,并包括核心引力不稳定和崩溃的点。我们自洽地捕捉到强烈对流的发展驱动的剧烈硅燃烧的外壳周围的铁芯。这种对流燃烧使铁核达到临界质量,并在电子俘获和光致衰变的驱动下坍缩。由3D对流产生的非球形结构和运动(湍流波动)在崩溃点处是实质性的。我们研究的影响,这种物理现实的3D初始条件的核心坍缩超新星机制,使用3D模拟,包括多物种中微子泄漏。我们的结论是,非球形祖结构不应被忽视,并有一个显着的和有利的影响中微子驱动爆炸的可能性。

英文摘要:

We present the first three dimensional (3D) simulation of the final minutes of iron core growth in a massive star, up to and including the point of core gravitational instability and collapse. We self-consistently capture the development of strong convection driven by violent Si burning in the shell surrounding the iron core. This convective burning builds the iron core to its critical (Chandrasekhar) mass and collapse ensues, driven by electron capture and photodisintegration. The non-spherical structure and motion (turbulent fluctuations) generated by 3D convection is substantial at the point of collapse. We examine the impact of such physically-realistic 3D initial conditions on the core-collapse supernova mechanism using 3D simulations including multispecies neutrino leakage. We conclude that non-spherical progenitor structure should not be ignored, and has a significant and favorable impact on the likelihood for neutrino-driven explosions.

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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