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arXiv 1503.07761astro-ph.HEastro-ph.CO
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在“长短”爆发GRB 060614的余辉中可能存在的Macronova

A possible Macronova in the late afterglow of the `long-short' burst GRB 060614

Bin Yang, Zhi-Ping Jin, Xiang Li, Stefano Covino, Xian-Zhong Zheng, Kenta Hotokezaka, Yi-Zhong Fan, Tsvi Piran, Da-Ming Wei

摘要:

长持续时间($>2$ s)$γ$ -射线爆发被认为是起源于大质量恒星的死亡,预计将伴随着超新星。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,它可以产生于一个锂Paczyboski macronova $-$的放射性衰变的碎片后,一个紧凑的二元合并。如果这种解释是正确的,GRB 060614是由一个紧凑的双星合并而不是一个大质量恒星的死亡产生的,它是一个重r过程元素的重要生产地点。大量的抛射物质支持黑洞-中子星合并,但不能排除双中子星合并的可能性。

英文摘要:

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 favors a black hole-neutron star merger but a double neutron star merger cannot be ruled out.

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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