{
  "id": "1508.07939",
  "version": "v1",
  "published": "2015-08-31T18:11:10.000Z",
  "updated": "2015-08-31T18:11:10.000Z",
  "title": "Electromagnetic emission from long-lived binary neutron star merger remnants II: lightcurves and spectra",
  "authors": [
    "Daniel M. Siegel",
    "Riccardo Ciolfi"
  ],
  "comment": "20 pages, 16 figures",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR",
    "gr-qc"
  ],
  "abstract": "Recent observations indicate that in a large fraction of binary neutron star (BNS) mergers a long-lived neutron star (NS) may be formed rather than a black hole. Unambiguous electromagnetic (EM) signatures of such a scenario would strongly impact our knowledge on how short gamma-ray bursts (SGRBs) and their afterglow radiation are generated. Furthermore, such EM signals would have profound implications for multimessenger astronomy with joint EM and gravitational-wave (GW) observations of BNS mergers, which will soon become reality with the ground-based advanced LIGO/Virgo GW detector network starting its first science run this year. Here we explore such EM signatures based on the model presented in a companion paper, which provides a self-consistent evolution of the post-merger system and its EM emission starting from an early baryonic wind phase and resulting in a final pulsar wind nebula that is confined by the previously ejected material. Lightcurves and spectra are computed for a wide range of post-merger physical properties and particular attention is paid to the emission in the X-ray band. In the context of SGRB afterglow modeling, we present X-ray lightcurves corresponding to the 'standard' and the recently proposed 'time-reversal' scenario (SGRB prompt emission produced at the time of merger or at the time of collapse of the long-lived NS). The resulting afterglow lightcurve morphologies include, in particular, single and two-plateau features with timescales and luminosities that are in good agreement with the observations by the Swift satellite. Furthermore, we compute the X-ray signal that should precede the SGRB in the time-reversal scenario. If found, such a signal would represent smoking-gun evidence for this scenario. Finally, we find a bright, highly isotropic EM transient signal peaking in the X-ray band ...",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-08-31T18:11:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "binary neutron star merger remnants",
      "long-lived binary neutron star merger",
      "ligo/virgo gw detector network",
      "isotropic em transient signal",
      "electromagnetic emission"
    ],
    "publication": {
      "doi": "10.3847/0004-637X/819/1/15"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1391123
    }
  }
}