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arXiv 2011.14361astro-ph.HEastro-ph.SR
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从20到40 $M_\odot$核心坍缩超新星的最后致密残留物:较低质量间隙

Final compact remnants in core-collapse supernovae from 20 to 40 $M_\odot$: the lower mass gap

Tong Liu, Yun-Feng Wei, Li Xue, Mou-Yuan Sun

摘要:

X射线双星观测表明,在$\sim 2-5 ~M_\odot$范围内的致密天体质量稀少,即“低质量间隙”。引力波探测已经解锁了另一种质量测量方法,aLIGO/Virgo已经在间隙中观察到了一些候选者。我们重新回顾了具有不同初始爆炸能量的$\sim 20-40~M_\odot$祖星的核心坍缩超新星(CCSNe)的数值模拟。因此,较低的爆炸能量自然会导致低金属性祖先更有效的回退吸积,然后CCSNe中心的新生黑洞(BH)可以逃离间隙,但中子星不能轻易坍缩成间隙中的BH;然而,太阳金属性祖先的最终残余物会粘在间隙中。如果我们考虑到只有剧烈的CCSNe才能被观测到,而那些具有较低爆炸能量的CCSNe是普遍存在的,那么较低的质量间隙就可以合理地建立起来。缺口的宽度和深度主要取决于CCSN的初始爆炸能量和金属丰度。人们可以预期,未来对致密天体的多信使观测将描绘出间隙的形状,这可能会限制CCSNe及其祖先的性质。

英文摘要:

A mass paucity of compact objects in the range of $\sim 2-5 ~M_\odot$ has been suggested by X-ray binary observations, namely, the "lower mass gap". Gravitational wave detections have unlocked another mass measurement method, and aLIGO/Virgo has observed some candidates in the gap. We revisit the numerical simulations on the core-collapse supernovae (CCSNe) for $\sim 20-40~M_\odot$ progenitor stars with differently initial explosion energies. As a result, the lower explosion energy naturally causes more efficient fallback accretion for low-metallicity progenitors, and then the newborn black holes (BHs) in the center of the CCSNe can escape from the gap, but neutron stars cannot easily collapse into BHs in the gap; nevertheless, the final remnants of the solar-metallicity progenitors stick to the gap. If we consider that only drastic CCSNe can be observed and that those with lower explosion energies are universal, the lower mass gap can be reasonably built. The width and depth of the gap are mainly determined by the typical CCSN initial explosion energy and metallicity. One can expect that the future multi-messenger observations of compact objects delineate the shape of the gap, which might constrain the properties of the CCSNe and their progenitors.

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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