{
  "id": "1904.00914",
  "version": "v1",
  "published": "2019-04-01T15:37:14.000Z",
  "updated": "2019-04-01T15:37:14.000Z",
  "title": "Unveiling the nature of compact object in the LMXB MAXI J1957+032 using Swift-XRT",
  "authors": [
    "Aru Beri",
    "D. Altamirano",
    "R. Wijnands",
    "N. Degenaar",
    "A. S. Parikh",
    "K. Yamaoka"
  ],
  "comment": "10 pages, Accepted for publication in MNRAS",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "MAXI J1957+032 is a transient Low-mass X-ray binary (LMXB) that underwent four short outbursts in 1.5 years since its discovery in 2015. The nature of the compact object in MAXI J1957+032 is not clear, but it was proposed to be a neutron star based on the short-duration of its outbursts. Here, we report the results obtained after performing spectral analysis using data obtained with the X-ray telescope aboard the Neil Gehrels Swift satellite. When describing the spectrum with an absorbed power law, we found that the spectra softens (the power-law index increases from $\\sim$ 1.8 to 2.5) as the luminosity decreases. Near the end of its outbursts the observed value of power-law index ($\\Gamma$) is $\\sim$ 2.5. To identify the nature of the compact object in this system, we used $\\Gamma$ as a tracer of the spectral evolution with luminosity. We found that for the distance of 4 kpc, our results suggest that the source harbours a neutron star.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-04-01T15:37:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "compact object",
      "lmxb maxi",
      "transient low-mass x-ray binary",
      "neil gehrels swift satellite",
      "neutron star"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}