{
  "id": "astro-ph/0110079",
  "version": "v1",
  "published": "2001-10-03T13:47:48.000Z",
  "updated": "2001-10-03T13:47:48.000Z",
  "title": "Gamma-Ray Signatures of Supernovae and Hypernovae",
  "authors": [
    "K. Nomoto",
    "K. Maeda",
    "Y. Mochizuki",
    "S. Kumagai",
    "H. Umeda",
    "T. Nakamura",
    "I. Tanihata"
  ],
  "comment": "Invited talk at the ``GAMMA2001'' Symposium, April 4-6, 2001, Baltimore. To be published in ``Gamma-Ray Astronomy 2001'' (American Institute of Physics)",
  "doi": "10.1063/1.1419452",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We review the characteristics of nucleosynthesis and radioactivities in 'Hypernovae', i.e., supernovae with very large explosion energies ($ \\gsim 10^{52} $ ergs) and their $\\gamma$-ray line signatures. We also discuss the $^{44}$Ti line $\\gamma$-rays from SN1987A and the detectability with INTEGRAL. Signatures of hypernova nucleosynthesis are seen in the large [(Ti, Zn)/Fe] ratios in very metal poor stars. Radioactivities in hypernovae compared to those of ordinary core-collapse supernovae show the following characteristics: 1) The complete Si burning region is more extended, so that the ejected mass of $^{56}$Ni can be much larger. 2) Si-burning takes place in higher entropy and more $\\alpha$-rich environment. Thus the $^{44}$Ti abundance relative to $^{56}$Ni is much larger. In aspherical explosions, $^{44}$Ti is even more abundant and ejected with velocities as high as $\\sim$ 15,000 km s$^{-1}$, which could be observed in $\\gamma$-ray line profiles. 3) The abundance of $^{26}$Al is not so sensitive to the explosion energy, while the $^{60}$Fe abundance is enhanced by a factor of $\\sim$ 3.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-10-03T13:47:48.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "95.55.Qf",
      "97.60.Bw",
      "26.30.+k",
      "98.70.Rz"
    ],
    "keywords": [
      "gamma-ray signatures",
      "explosion energy",
      "large explosion energies",
      "ray line profiles",
      "ray line signatures"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 577144,
      "adsabs": "2001AIPC..587..487N"
    }
  }
}