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arXiv 2202.09370astro-ph.HE
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用核坍缩超新星的一维模拟比较N=50区的电子俘获率

Comparison of Electron Capture Rates in the N=50 Region using 1D Simulations of Core-collapse Supernovae

Zac Johnston, Sheldon Wasik, Rachel Titus, MacKenzie L. Warren, Evan P. O'Connor, Remco Zegers, Sean M. Couch

摘要:

最近的研究强调了核心坍缩超新星(CCSNe)模型对N=50闭壳层区域附近富中子核的电子捕获率(EC)的敏感性。在这项工作中,我们进行了一个大的套件的一维CCSN模拟200恒星的祖先最近更新的EC率在这个地区。为了比较,我们重复模拟使用两个以前的实现EC率:一个微物理库参数化N=50率(LMP),和一个老的独立粒子近似(IPA)。我们遵循的模拟,通过冲击复苏到几秒钟后反弹,并表明,EC率产生一致的印记CCSN属性,往往超越祖本身的作用。值得注意的影响包括核心坍缩的时间尺度,反弹时内核的电子分数和质量,通过冲击的吸积率,复苏的成功或失败,以及中心致密残留物的性质。我们还比较了可观测到的中微子信号的中子化爆发在一个沙丘状的检测器,并找到一致的影响的计数和平均能量。总的来说,更新的速率导致介于LMP和IPA之间的性质,但比两者略有利于爆炸。

英文摘要:

Recent studies have highlighted the sensitivity of core-collapse supernovae (CCSNe) models to electron-capture (EC) rates on neutron-rich nuclei near the N=50 closed-shell region. In this work, we perform a large suite of one-dimensional CCSN simulations for 200 stellar progenitors using recently updated EC rates in this region. For comparison, we repeat the simulations using two previous implementations of EC rates: a microphysical library with parameterized N=50 rates (LMP), and an older independent-particle approximation (IPA). We follow the simulations through shock revival up to several seconds post-bounce, and show that the EC rates produce a consistent imprint on CCSN properties, often surpassing the role of the progenitor itself. Notable impacts include the timescale of core collapse, the electron fraction and mass of the inner core at bounce, the accretion rate through the shock, the success or failure of revival, and the properties of the central compact remnant. We also compare the observable neutrino signal of the neutronization burst in a DUNE-like detector, and find consistent impacts on the counts and mean energies. Overall, the updated rates result in properties that are intermediate between LMP and IPA, and yet slightly more favorable to explosion than both.

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