{
  "id": "1408.3116",
  "version": "v1",
  "published": "2014-08-13T20:00:00.000Z",
  "updated": "2014-08-13T20:00:00.000Z",
  "title": "How Much Can $^{56}$Ni Be Synthesized by Magnetar Model for Long Gamma-ray Bursts and Hypernovae?",
  "authors": [
    "Yudai Suwa",
    "Nozomu Tominaga"
  ],
  "comment": "5 pages, 5 figures",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "A rapidly rotating neutron star with strong magnetic fields, called magnetar, is a possible candidate for the central engine of long gamma-ray bursts and hypernovae (HNe). We solve the evolution of a shock wave driven by the wind from magnetar and evaluate the temperature evolution, by which we estimate the amount of $^{56}$Ni that would produce a bright emission of HNe. We obtain a constraint on the magnetar parameters, namely the poloidal magnetic field strength ($B_p$) and initial angular velocity ($\\Omega_i$), for synthesizing enough $^{56}$Ni mass to explain HNe ($M_{^{56}\\mathrm{Ni}}\\gtrsim 0.2M_\\odot$), i.e. $(B_p/10^{16}~\\mathrm{G})^{1/2}(\\Omega_i/10^4~\\mathrm{rad~s}^{-1})\\gtrsim 1$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-08-13T20:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "long gamma-ray bursts",
      "magnetar model",
      "hypernovae",
      "poloidal magnetic field strength",
      "initial angular velocity"
    ],
    "publication": {
      "doi": "10.1093/mnras/stv901",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Jul",
      "volume": 451,
      "number": 1,
      "pages": 282
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1310798,
      "adsabs": "2015MNRAS.451..282S"
    }
  }
}