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26 April 2024 |
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Searching for the radio remnants of short duration gamma-ray bursts | | Roberto Ricci
; Eleonora Troja
; Gabriele Bruni
; Tatsuya Matsumoto
; Luigi Piro
; Brendan O'Connor
; Tsvi Piran
; Niloofar Navaieelavasani
; Alessandra Corsi
; Bruno Giacomazzo
; Mark H. Wieringa
; | | Date: |
9 Aug 2020 | | Abstract: | Neutron star mergers produce a substantial amount of fast-moving ejecta,
expanding outwardly for years after the merger. The interaction of these ejecta
with the surrounding medium may produce a weak isotropic radio remnant,
detectable in relatively nearby events. We use late-time radio observations of
short duration gamma-ray bursts (sGRBs) to constrain this model. Two samples of
events were studied: four sGRBs that are possibly in the local (<200 Mpc)
universe were selected to constrain the remnant non-thermal emission from the
sub-relativistic ejecta, whereas 17 sGRBs at cosmological distances were used
to constrain the presence of a proto-magnetar central engine, possibly
re-energezing the merger ejecta. We consider the case of GRB~170817A/GW170817,
and find that in this case the early radio emission may be quenched by the jet
blast-wave. In all cases, for ejecta mass range of M_ej lesssim 10^{-2} (5 *
10^{-2}) M_sun, we can rule out very energetic merger ejecta E_ej gtrsim 5 *
10^{52}(10^{53}) erg, thus excluding the presence of a powerful magnetar as a
merger remnant. | | Source: | arXiv, 2008.03659 | | Services: | Forum | Review | PDF | Favorites | |
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