{
  "id": "1408.1305",
  "version": "v2",
  "published": "2014-08-06T14:53:52.000Z",
  "updated": "2014-11-10T17:57:28.000Z",
  "title": "Numerical models of blackbody-dominated gamma-ray bursts -- I. Hydrodynamics and the origin of the thermal emission",
  "authors": [
    "Carlos F. Cuesta-Martínez",
    "Miguel-Ángel Aloy",
    "Petar Mimica"
  ],
  "comment": "23 pages, 22 figures (21 in color), accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "GRB 101225A is a prototype of the class of blackbody-dominated (BBD) gamma-ray bursts (GRBs). It has been suggested that BBD-GRBs result from the merger of a binary system formed by a neutron star and the helium core of an evolved star. We have modelled the propagation of ultrarelativistic jets through the environment left behind the merger by means of relativistic hydrodynamic simulations. In this paper, the output of our numerical models is post-processed to obtain the (thermal) radiative signature of the resulting outflow. We outline the most relevant dynamical details of the jet propagation and connect them to the generation of thermal radiation in GRB events akin to that of GRB 101225A. A comprehensive parameter study of the jet/environment interaction has been performed and synthetic light curves are confronted with the observational data. The thermal emission in our models originates from the interaction between the jet and the hydrogen envelope ejected during the neutron star/He core merger. We find that the lack of a classical afterglow and the accompanying thermal emission in BBD-GRBs can be explained by the interaction of an ultrarelativistic jet with a toroidally shaped ejecta whose axis coincides with the binary rotation axis. The spectral inversion and reddening happening at about 2 d in GRB 101225A can be related to the time at which the massive shell ejected in an early phase of the common envelope evolution of the progenitor system is completely ablated by the ultrarelativistic jet.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-08-06T14:53:52.000Z",
      "title": "Numerical models of black body dominated GRBs: I. Hydrodynamics and the origin of the thermal emission",
      "abstract": "We extend an existing theoretical model to explain the class of Black-Body Dominated GRBs, namely long lasting events characterized by the presence of a notable thermal component trailing the GRB prompt emission, and a rather weak traditional afterglow. GRB 101225A, the Christmas Burst (CB), is a prototype of such class. It has been suggested that BBD-GRBs could result from the merger of a binary system formed by a neutron star and the Helium core of a main sequence star. We have modeled the propagation of ultrarelativistic jets through the environment left behind the merger by means of detailed relativistic hydrodynamic numerical simulations. In this paper, the output of our numerical models is further postprocessed to obtain the (thermal) radiative signature of the resulting outflow. The complete (thermal and non-thermal) output of our models is considered in a companion contribution. Here, we outline the most relevant dynamical details of the jet propagation and connect them to the generation of thermal radiation in GRB events akin to that of the CB. A comprehensive parameter study of the jet/environment interaction has been performed and synthetic light curves are confronted with the observational data. The thermal emission in our models originates from the interaction between the jet and the Hydrogen envelope ejected during the neutron star / He core merger. We find that the lack of a classical afterglow and the accompanying thermal emission in BBD-GRBs can be explained by the interaction of an ultrarelativistic jet with a toroidally shaped ejecta whose axis coincides with the binary rotation axis. We obtain that the spectral inversion and reddening happening at about 2 days in the CB can be related to the time at which the massive shell ejected in an early phase of the common-envelope evolution of the progenitor system is completely ablated by the ultrarelativistic jet.",
      "comment": "20 pages, 18 figures (17 in color). Submitted to MNRAS",
      "journal": null,
      "doi": null
    },
    {
      "version": "v2",
      "updated": "2014-11-10T17:57:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "thermal emission",
      "blackbody-dominated gamma-ray bursts",
      "numerical models",
      "grb 101225a",
      "ultrarelativistic jet"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2186",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Jan",
      "volume": 446,
      "number": 2,
      "pages": 1716
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1309982,
      "adsabs": "2015MNRAS.446.1716C"
    }
  }
}