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arXiv 1707.02685astro-ph.HE
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超剥离Ic型超新星的爆炸核合成:对轻trans-Fe元素的应用

Explosive nucleosynthesis of ultra-stripped Type Ic supernovae: application to light trans-iron elements

Takashi Yoshida, Yudai Suwa, Hideyuki Umeda, Masaru Shibata, Koh Takahashi

摘要:

研究了由1.45和1.5 M $_\odot$ CO星演化的超剥离Ic型超新星在中微子驱动的二维爆炸过程中的爆炸核合成。这些超新星以$\sim 10^{50}$ erg的爆炸能量爆炸并释放出$\sim 0.1$ M $_\odot$喷出物。轻的反式铁元素Ga-Zr在中微子辐照的喷出物中产生。这些元素的丰度分布有很大的不确定性,因为中微子照射的喷出物的电子分数的不确定性。元素的产率将小于0.01 M $_\odot$。由轻CO核演化而来的超剥离超新星和核塌缩超新星可能是轻反式铁元素的主要来源。它们也能产生富中子核$^{48}$ Ca。超剥离超新星喷出$^{56}$ Ni,$\sim$为0.006 - 0.01 M $_\odot$。如果大部分中微子辐照的喷出物是富质子的,则会产生更多的$^{56}$ Ni。这些超新星的光变曲线表明它们是一种亚发光的快速衰变爆炸,峰值量级约为$-15$ - $-16$。未来对超剥离超新星的观测可能会对一类中子星合并的事件率产生限制。

英文摘要:

We investigate the explosive nucleosynthesis during two dimensional neutrino-driven explosion of ultra-stripped Type Ic supernovae evolved from 1.45 and 1.5 M$_\odot$ CO stars. These supernovae explode with the explosion energy of $\sim 10^{50}$ erg and release $\sim 0.1$ M$_\odot$ ejecta. The light trans-iron elements Ga-Zr are produced in the neutrino-irradiated ejecta. The abundance distribution of these elements has a large uncertainty because of the uncertainty of the electron fraction of the neutrino-irradiated ejecta. The yield of the elements will be less than 0.01 M$_\odot$. Ultra-stripped supernova and core-collapse supernova evolved from a light CO core can be main sources of the light trans-iron elements. They could also produce neutron-rich nuclei $^{48}$Ca. The ultra-stripped supernovae eject $^{56}$Ni of $\sim$ 0.006 - 0.01 M$_\odot$. If most of neutrino-irradiated ejecta is proton-rich, $^{56}$Ni will be produced more abundantly. The light curves of these supernovae indicate sub-luminous fast decaying explosion with the peak magnitude of about $-15$ - $-16$. Future observations of ultra-stripped supernovae could give a constraint to the event rate of a class of neutron star mergers.

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