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A possible macronova in the late afterglow of the long-short burst GRB 060614.

ABSTRACT: Long-duration (>2 s) ?-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-Paczy?ski 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.

SUBMITTER: Yang B

PROVIDER: S-EPMC4490351 | biostudies-literature | 2015 Jun

REPOSITORIES: biostudies-literature

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A possible macronova in the late afterglow of the long-short burst GRB 060614.

Yang Bin B Jin Zhi-Ping ZP Li Xiang X Covino Stefano S Zheng Xian-Zhong XZ Hotokezaka Kenta K Fan Yi-Zhong YZ Piran Tsvi T Wei Da-Ming DM

Nature communications 20150611

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 ...[more]

PMID: 26065563

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