{
  "id": "2207.04107",
  "version": "v1",
  "published": "2022-07-08T19:14:58.000Z",
  "updated": "2022-07-08T19:14:58.000Z",
  "title": "Burst-Disk Interaction in 4U 1636-536 as observed by NICER",
  "authors": [
    "Tolga Guver",
    "Funda Bostanci",
    "Tugba Boztepe",
    "Ersin Gogus",
    "Peter Bult",
    "Unnati Kashyap",
    "Manoneeta Chakraborty",
    "David R. Ballantyne",
    "Renee Ludlam",
    "Christian Malacaria",
    "Gaurava K. Jaisawal",
    "Tod E. Strohmayer",
    "Sebastien Guillot"
  ],
  "comment": "Accepted for publication in the Astrophysical Journal",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "We present the detection of 51 thermonuclear X-ray bursts observed from 4U 1636-536 by the Neutron Star Interior Composition Explorer (NICER) over the course of a three year monitoring campaign. We performed time resolved spectroscopy for 40 of these bursts and showed the existence of a strong soft excess in all the burst spectra. The excess emission can be characterized by the use of a scaling factor (f_a method) to the persistent emission of the source, which is attributed to the increased mass accretion rate on to the neutron star due to Poynting-Robertson drag. The soft excess emission can also be characterized by the use of a model taking into account the reflection of the burst emission off of the accretion disk. We also present time resolved spectral analysis of 5 X-ray bursts simultaneously observed by NICER and AstroSat, which confirm the main results with even greater precision. Finally, we present evidence for Compton cooling using 7 X-ray bursts observed contemporaneously with \\nustar, by means of a correlated decrease in the hard X-ray lightcurve of 4U 1636-536 as the bursts start.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-07-08T19:14:58.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "burst-disk interaction",
      "neutron star interior composition explorer",
      "excess emission",
      "strong soft excess",
      "thermonuclear x-ray bursts"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}