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

R. Ricci, E. Troja, G. Bruni, T. Matsumoto, L. Piro, B. O'Connor, T. Piran, N. Navaieelavasani, A. Corsi, B. Giacomazzo, M. H. Wieringa

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)1708-1720
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume500
Issue number2
DOIs
StatePublished - Jan 1 2021

Keywords

  • Gamma-ray burst: general
  • Stars: magnetars
  • Stars: neutron

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