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arXiv 1004.0249astro-ph.HEastro-ph.SR
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爆炸性共包层抛射:对伽马射线暴和低质量黑洞双星的意义

Explosive Common-Envelope Ejection: Implications for Gamma-Ray Bursts and Low-Mass Black-Hole Binaries

Philipp Podsiadlowski, Natasha Ivanova, Stephen Justham, Saul Rappaport

摘要:

我们提出了一个新的机制,在一个大质量的双星,其中的能源是核能,而不是轨道能的共同信封喷射。这可能发生在一个大质量的一次核与一个1-3兆太阳的二次核缓慢合并的过程中,当时一次核已经完成了氦的核心燃烧。我们表明,在最后的合并阶段,从二次富氢的材料可以注入到氦燃烧壳的主要。这导致了一个核失控和氢和氦层的爆炸性喷射,产生了一个包含一颗CO星和一颗低质量伴星的近距离双星。我们认为,这提出了一个可行的方案,以产生短周期的黑洞双星和长时间的伽马射线暴(LGRB)。我们估计,在太阳金属丰度的LGRB率约为1.e-6每年,这意味着这可能占所有LGRB的一个显着的部分,这一比率应该在较低的金属丰度较高。

英文摘要:

We present a new mechanism for the ejection of a common envelope in a massive binary, where the energy source is nuclear energy rather than orbital energy. This can occur during the slow merger of a massive primary with a secondary of 1-3 Msun when the primary has already completed helium core burning. We show that, in the final merging phase, hydrogen-rich material from the secondary can be injected into the helium-burning shell of the primary. This leads to a nuclear runaway and the explosive ejection of both the hydrogen and the helium layer, producing a close binary containing a CO star and a low-mass companion. We argue that this presents a viable scenario to produce short-period black-hole binaries and long-duration gamma-ray bursts (LGRBs). We estimate a LGRB rate of about 1.e-6 per year at solar metallicity, which implies that this may account for a significant fraction of all LGRBs, and that this rate should be higher at lower metallicity.

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