{
  "id": "1908.03111",
  "version": "v1",
  "published": "2019-08-08T15:13:21.000Z",
  "updated": "2019-08-08T15:13:21.000Z",
  "title": "Characterizing the VHE emission of LS I +61 303 using VERITAS observations",
  "authors": [
    "D. B. Kieda",
    "the VERITAS Collaboration"
  ],
  "comment": "8 pages, 2 figures, 1 table. Proceedings of the 36th International Cosmic Ray Conference (ICRC2019) Madison, WI July 24-Aug 1, 2019",
  "journal": "PoS(ICRC2019)713",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "The TeV gamma-ray binary LS I +61 303, approximately 2 kpc from Earth, consists of a low mass compact object in an eccentric orbit around a massive Be star. LS I +61 303 exhibits modulated VHE gamma-ray emission around its 26.5 days orbit, with strongest TeV emission during its apastron passage (orbital phases {\\phi}=0.55-0.65). Multiple flaring episodes with nightly flux variability at TeV energies have been observed since its detection in 2006. GeV, X-ray, and radio emission have been detected along the entire orbit, enabling detailed study of the orbital modulation pattern and its super-orbital period. Previously reported TeV baseline emission and spectral variations may indicate a neutron star flip-flop scenario, in which the binary system switches between accretor and propeller phases at different phases of the orbit. Since September 2007, VERITAS has observed LS I +61 303 over three additional seasons, accruing 220+ hours of data during different parts of its orbit. In this work, we present a summary of recent and long-term VERITAS observations of LS I +61 303. This analysis includes a discussion of the observed variation of TeV emission during different phases of the orbit, and during different superorbital phases.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-08-08T15:13:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "vhe emission",
      "low mass compact object",
      "neutron star flip-flop scenario",
      "tev gamma-ray binary ls",
      "binary system switches"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}