{
  "id": "1109.5008",
  "version": "v1",
  "published": "2011-09-23T06:51:18.000Z",
  "updated": "2011-09-23T06:51:18.000Z",
  "title": "A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary",
  "authors": [
    "Diego F. Torres",
    "Nanda Rea",
    "Paolo Esposito",
    "Jian Li",
    "Yupeng Chen",
    "Shu Zhang"
  ],
  "comment": "The Astrophysical Journal, in press",
  "categories": [
    "astro-ph.HE",
    "astro-ph.GA"
  ],
  "abstract": "We report on the Swift-BAT detection of a short burst from the direction of the TeV binary LS I +61 303, resembling those generally labelled as magnetar-like. We show that it is likely that the short burst was indeed originating from LS I +61 303 (although we cannot totally exclude the improbable presence of a far-away line-of-sight magnetar) and that it is a different phenomena with respect to the previously-observed ks-long flares from this system. Accepting as a hypothesis that LS I +61 303 is the first magnetar detected in a binary system, we study which are the implications. We find that a magnetar-composed LS I +61 303-system would most likely be (i.e., for usual magnetar parameters and mass-loss rate) subject to a flip-flop behavior, from a rotational powered regime (in apastron) to a propeller regime (in periastron) along each of the LS I +61 303, eccentric orbital motion. We prove that whereas near apastron an inter-wind shock can lead to the normally observed LS I +61 303behavior, with TeV emission, the periastron propeller is expected to efficiently accelerate particles only to sub-TeV energies. This flip-flop scenario would explain the system's behavior where a recurrent TeV emission was seen appearing near apastron only, the anti-correlation of GeV and TeV emission, and the long-term TeV variability (which seems correlated to LS I +61 303's super-orbital period), including the appearance of a low TeV-state. Finally, we qualitatively put the multi-wavelength phenomenology in context of our proposed model, and make some predictions for further testing.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-09-23T06:51:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "gamma-ray binary",
      "magnetar-like event",
      "short burst",
      "usual magnetar parameters",
      "tev binary ls"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/744/2/106",
      "journal": "The Astrophysical Journal",
      "year": 2012,
      "month": "Jan",
      "volume": 744,
      "number": 2,
      "pages": 106
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 928329,
      "adsabs": "2012ApJ...744..106T"
    }
  }
}