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-energizing 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 Mej ≤ 10-2(5×10-2)M⊙, we can rule out very energetic merger ejecta Eej≥ 5×1052(1053)erg, thus excluding the presence of a powerful magnetar as a merger remnant.

Ricci, R., Troja, E., Bruni, G., Matsumoto, T., Piro, L., O'Connor, B., et al. (2021). Searching for the radio remnants of short-duration gamma-ray bursts. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 500(2 (January 2021)), 1708-1720 [10.1093/mnras/staa3241].

Searching for the radio remnants of short-duration gamma-ray bursts

Giacomazzo B.;
2021

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-energizing 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 Mej ≤ 10-2(5×10-2)M⊙, we can rule out very energetic merger ejecta Eej≥ 5×1052(1053)erg, thus excluding the presence of a powerful magnetar as a merger remnant.
Articolo in rivista - Articolo scientifico
Gamma-ray burst: general; Stars: magnetars; Stars: neutron;
English
23-ott-2020
2021
500
2 (January 2021)
1708
1720
reserved
Ricci, R., Troja, E., Bruni, G., Matsumoto, T., Piro, L., O'Connor, B., et al. (2021). Searching for the radio remnants of short-duration gamma-ray bursts. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 500(2 (January 2021)), 1708-1720 [10.1093/mnras/staa3241].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/300967
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