{
  "id": "2009.06500",
  "version": "v1",
  "published": "2020-09-14T15:03:03.000Z",
  "updated": "2020-09-14T15:03:03.000Z",
  "title": "Swift unveils the orbital period of IGR J18214-1318",
  "authors": [
    "G. Cusumano",
    "A. D'Aì",
    "A. Segreto",
    "V. La Parola",
    "M. Del Santo"
  ],
  "comment": "7 pages, 7 figures. Accepted by MNRAS on 2020-08-17",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We analysed 13 years of the Neil Gehrels Swift Observatory survey data collected on the High Mass X-ray Binary IGR J18214-1318. Performing the timing analysis we detected a periodic signal of 5.42 d. From the companion star characteristics we derived an average orbital separation of $\\sim 41 \\rm R_{\\odot}\\simeq 2 R_{\\star}$. The spectral type of the companion star (O9) and the tight orbital separation suggest that IGR~J18214-1318 is a wind accreting source with eccentricity lower than 0.17. The intensity profile folded at the orbital period shows a deep minimum compatible with an eclipse of the source by the companion star. In addition, we report on the broad-band 0.6--100 keV spectrum using data from XMM-Newton, NuSTAR, and Swift, applying self-consistent physical models. We find that the spectrum is well fitted either by a pure thermal Comptonization component, or, assuming that the source is a neutron star accreting above the critical regime, by a combined thermal and bulk-motion Comptonization model. In both cases, the presence of a local neutral absorption (possibly related to the thick wind of the companion star) is required.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-09-14T15:03:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "orbital period",
      "swift unveils",
      "companion star",
      "high mass x-ray binary igr",
      "gehrels swift observatory survey data"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}