A possible macronova in the late afterglow of the long-short burst GRB 060614.
A possible macronova in the late afterglow of the long-short burst GRB 060614.
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长短爆发 GRB 060614 的晚余辉中可能存在巨新星
DOI：
10.1038/ncomms8323
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发表时间：
2015-06-11
影响因子：
16.6
通讯作者：
Wei, Da-Ming
中科院分区：
文献类型：
--
作者：
Yang, Bin;Jin, Zhi-Ping;Li, Xiang;Covino, Stefano;Zheng, Xian-Zhong;Hotokezaka, Kenta;Fan, Yi-Zhong;Piran, Tsvi;Wei, Da-Ming
长持续时间（> 2秒）的γ射线暴被认为是起源于大质量恒星的死亡，预计会伴随着超新星。GRB 060614持续了102秒，缺乏超新星般的发射，其物理起源仍然存在争议。在这里，我们报告的近红外线凸块，这是显着高于定期衰减余辉的发现。这个红色的突起与已知最弱的超新星也不一致。然而，它可以产生于Li-Paczyboski macronova-碎片的放射性衰变后，一个紧凑的二元合并。如果这种解释是正确的，那么GRB 060614是由一个紧密的双星合并而不是一颗大质量星星的死亡产生的，它是重r过程元素的重要生产地。大量的喷射物质支持黑洞-中子星星合并，但不能排除双中子星星合并的可能性。 伽玛射线暴GRB 060614是一个不寻常的天体物理事件，其起源仍然不清楚。这项研究重新检查了爆发的余辉数据，发现光谱中的过量似乎与弱macronova一致，这表明GRB 060614起源于一个紧凑的双星合并。
Long-duration (>2 s) γ-ray bursts that are believed to originate from the death of massive stars are expected to be accompanied by supernovae. GRB 060614, that lasted 102 s, lacks a supernova-like emission down to very stringent limits and its physical origin is still debated. Here we report the discovery of near-infrared bump that is significantly above the regular decaying afterglow. This red bump is inconsistent with even the weakest known supernova. However, it can arise from a Li-Paczyński macronova—the radioactive decay of debris following a compact binary merger. If this interpretation is correct, GRB 060614 arose from a compact binary merger rather than from the death of a massive star and it was a site of a significant production of heavy r-process elements. The significant ejected mass favours a black hole–neutron star merger but a double neutron star merger cannot be ruled out. The gamma-ray burst GRB 060614 was an unusual astrophysical event whose origins are still unclear. This study re-examines the burst's afterglow data and finds an excess in the spectrum that appears to be consistent with a weak macronova, suggesting that GRB 060614 originated from a compact binary merger.
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