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29 March 2024 |
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Article overview
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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
; | Date: |
26 Mar 2015 | Abstract: | GRB 060614 was a unique burst straddling both long and short duration
gamma-ray bursts and its physical origin is still debated. Here we re-examine
the afterglow data of GRB 060614 and find a significant F814W-band excess at
$tsim 13.6$ day after the burst observed by the {it Hubble Space Telescope
(HST)}. This corresponds to an extremely-low luminosity $sim 3 imes
10^{40}~{
m erg~s^{-1}}$. The excess component has a very red spectrum and a
rapid decline, both unexpected within the present theoretical framework of
afterglow. We examine two possible sources of this signal$-$a very weak
supernova and a Li-Paczynski Macronova/kilonova. We find that the observed
signal is incompatible with a weak supernova. However, it is compatible with
the ejection of $sim 0.03-0.1~M_odot$ of $r-$process material. If this
interpretation is correct GRB 060614 arose from a compact binary (most likely a
black hole$-$neutron star but also possibly a double neutron star) merger. | Source: | arXiv, 1503.7761 | Services: | Forum | Review | PDF | Favorites |
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