{
  "id": "1211.1889",
  "version": "v2",
  "published": "2012-11-08T16:01:05.000Z",
  "updated": "2013-05-18T23:15:29.000Z",
  "title": "Constraining the Statistics of Population III Binaries",
  "authors": [
    "Athena Stacy",
    "Volker Bromm"
  ],
  "comment": "16 pages, 14 figures, to appear in MNRAS",
  "categories": [
    "astro-ph.CO",
    "astro-ph.GA"
  ],
  "abstract": "We perform a cosmological simulation in order to model the growth and evolution of Population III (Pop III) stellar systems in a range of host minihalo environments. A Pop III multiple system forms in each of the ten minihaloes, and the overall mass function is top-heavy compared to the currently observed initial mass function in the Milky Way. Using a sink particle to represent each growing protostar, we examine the binary characteristics of the multiple systems, resolving orbits on scales as small as 20 AU. We find a binary fraction of ~36%, with semi-major axes as large as 3000 AU. The distribution of orbital periods is slightly peaked at < 900 yr, while the distribution of mass ratios is relatively flat. Of all sink particles formed within the ten minihaloes, ~50% are lost to mergers with larger sinks, and ~50% of the remaining sinks are ejected from their star-forming disks. The large binary fraction may have important implications for Pop III evolution and nucleosynthesis, as well as the final fate of the first stars.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-05-18T23:15:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "population",
      "sink particle",
      "statistics",
      "initial mass function",
      "host minihalo environments"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stt789",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2013,
      "month": "Aug",
      "volume": 433,
      "number": 2,
      "pages": 1094
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1199248,
      "adsabs": "2013MNRAS.433.1094S"
    }
  }
}