Electromagnetic emission from long-lived binary neutron star merger remnants II: lightcurves and spectra

摘要: Recent observations indicate that in a large fraction of binary neutron star (BNS) mergers long-lived (NS) may be formed rather than black hole. Unambiguous electromagnetic (EM) signatures such scenario would strongly impact our knowledge on how short gamma-ray bursts (SGRBs) and their afterglow radiation are generated. Furthermore, EM signals have profound implications for multimessenger astronomy with joint gravitational-wave (GW) BNS mergers, which will soon become reality the ground-based advanced LIGO/Virgo GW detector network starting its first science run this year. Here we explore based model presented companion paper, provides self-consistent evolution post-merger system emission from an early baryonic wind phase resulting final pulsar nebula is confined by previously ejected material. Lightcurves spectra computed wide range physical properties particular attention paid to X-ray band. In context SGRB modeling, present lightcurves corresponding 'standard' recently proposed 'time-reversal' (SGRB prompt produced at time merger or collapse NS). The lightcurve morphologies include, particular, single two-plateau features timescales luminosities good agreement Swift satellite. compute signal should precede time-reversal scenario. If found, represent smoking-gun evidence Finally, find bright, highly isotropic transient peaking band ...