{
  "id": "0903.5403",
  "version": "v1",
  "published": "2009-03-31T08:53:19.000Z",
  "updated": "2009-03-31T08:53:19.000Z",
  "title": "Discovery of a short orbital period in the Supergiant Fast X-ray Transient IGR J16479-4514",
  "authors": [
    "Chetana Jain",
    "Biswajit Paul",
    "Anjan Dutta"
  ],
  "comment": "Accepted for publication in MNRAS Letters; 5 pages,3 figures and 0 tables",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report here discovery of a 3.32 day orbital period in the Supergiant Fast X-ray Transient (SFXT) source IGR J16479-4514. Using the long term light curve of this source obtained with Swift-BAT in the energy range of 15-50 keV, we have clearly detected an orbital modulation including a full eclipse of duration ~0.6 day. In the hard X-ray band of the BAT instrument, the eclipse ingress and egress are rapid. We have also used the long term light curve obtained with the RXTE -ASM in the energy range of 1.5-12 keV. Taken independently, the detection of orbital modulation in the RXTE -ASM light curve is not significant. However, considering a clear detection of orbital modulation in the BAT light curve, we have used the ASM light curve for a more precise determination of the orbital period. IGR J16479-4514 has the shortest orbital period among the three SFXTs with measured/known orbital period. We discuss the implication of a short orbital period with the various mechanisms proposed to explain the transient nature of this class of sources.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-03-31T08:53:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "supergiant fast x-ray transient igr",
      "short orbital period",
      "long term light curve",
      "orbital modulation",
      "asm light curve"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1745-3933.2009.00668.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2009,
      "month": "Jul",
      "volume": 397,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 816784,
      "adsabs": "2009MNRAS.397L..11J"
    }
  }
}