{
  "id": "1503.00441",
  "version": "v1",
  "published": "2015-03-02T08:40:36.000Z",
  "updated": "2015-03-02T08:40:36.000Z",
  "title": "A unified picture for low-luminosity and long gamma-ray bursts based on the extended progenitor of llgrb 060218/SN 2006aj",
  "authors": [
    "Ehud Nakar"
  ],
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "The relation between long gamma-ray bursts (LGRBs) and low-luminosity GRBs (llgrbs) is a long standing puzzle -- on the one hand their high energy emission properties are fundamentally different, implying a different gamma-ray source, yet both are associated with similar supernovae of the same peculiar type (broad-line Ic), pointing at a similar progenitor and a similar explosion mechanism. Here we analyze the multi-wavelength data of the particularly well-observed SN 2006aj, associated with llgrb 060218, finding that its progenitor star is sheathed in an extended ($>100R_\\odot$), low-mass ($\\sim 0.01M_\\odot$) envelope. This progenitor structure implies that the gamma-ray emission in this llgrb is generated by a mildly relativistic shock breakout. It also suggests a unified picture for llgrbs and LGRBs, where the key difference is the existence of an extended low-mass envelope in llgrbs and its absence in LGRBs. The same engine, which launches a relativistic jet, can drive the two explosions, but, while in LGRBs the ultra-relativistic jet emerges from the bare progenitor star and produces the observed gamma-rays, in llgrbs the extended envelope smothers the jet and prevents the generation of a large gamma-ray luminosity. Instead, the jet deposits all its energy in the envelope, driving a mildly relativistic shock that upon breakout produces a llgrb. In addition for giving a unified view of the two phenomena, this model provides a natural explanation to many observed properties of llgrbs. It also implies that llgrbs are a viable source of the observed extra-galactic diffuse neutrino flux and that they are promising sources for future gravitational wave detectors.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-03-02T08:40:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "long gamma-ray bursts",
      "unified picture",
      "extended progenitor",
      "low-luminosity",
      "mildly relativistic shock"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/807/2/172"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1346923
    }
  }
}