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The Macronova in GRB 050709 and the GRB-macronova connection

Author

Listed:
  • Zhi-Ping Jin

    (Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences)

  • Kenta Hotokezaka

    (Racah Institute of Physics, The Hebrew University)

  • Xiang Li

    (Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Masaomi Tanaka

    (National Astronomical Observatory of Japan)

  • Paolo D’Avanzo

    (INAF/Brera Astronomical Observatory)

  • Yi-Zhong Fan

    (Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences
    Collaborative Innovation Center of Modern Astronomy and Space Exploration, Nanjing University)

  • Stefano Covino

    (INAF/Brera Astronomical Observatory)

  • Da-Ming Wei

    (Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences)

  • Tsvi Piran

    (Racah Institute of Physics, The Hebrew University)

Abstract

GRB 050709 was the first short Gamma-ray Burst (sGRB) with an identified optical counterpart. Here we report a reanalysis of the publicly available data of this event and the discovery of a Li-Paczynski macronova/kilonova that dominates the optical/infrared signal at t>2.5 days. Such a signal would arise from 0.05 r-process material launched by a compact binary merger. The implied mass ejection supports the suggestion that compact binary mergers are significant and possibly main sites of heavy r-process nucleosynthesis. Furthermore, we have reanalysed all afterglow data from nearby short and hybrid GRBs (shGRBs). A statistical study of shGRB/macronova connection reveals that macronova may have taken place in all these GRBs, although the fraction as low as 0.18 cannot be ruled out. The identification of two of the three macronova candidates in the I-band implies a more promising detection prospect for ground-based surveys.

Suggested Citation

  • Zhi-Ping Jin & Kenta Hotokezaka & Xiang Li & Masaomi Tanaka & Paolo D’Avanzo & Yi-Zhong Fan & Stefano Covino & Da-Ming Wei & Tsvi Piran, 2016. "The Macronova in GRB 050709 and the GRB-macronova connection," Nature Communications, Nature, vol. 7(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12898
    DOI: 10.1038/ncomms12898
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