{
  "id": "2309.05189",
  "version": "v1",
  "published": "2023-09-11T01:39:54.000Z",
  "updated": "2023-09-11T01:39:54.000Z",
  "title": "Super-Eddington Accretion as a Possible Scenario to Form GW190425",
  "authors": [
    "W. T. Zhang",
    "Z. H. T. Wang",
    "J. -P. Zhu",
    "R. -C. Hu",
    "X. W. Shu",
    "Q. W. Tang",
    "S. X. Yi",
    "F. Lyu",
    "E. W. Liang",
    "Y. Qin"
  ],
  "comment": "9 pages, 10 figures, resubmitted to MNRAS with minor revisions; comments welcome",
  "categories": [
    "astro-ph.HE",
    "astro-ph.SR"
  ],
  "abstract": "On 2019 April 25, the LIGO/Virgo Scientific Collaboration detected a compact binary coalescence, GW190425. Under the assumption of the binary neutron star (BNS), the total mass of $3.4^{+0.3}_{-0.1}\\, M_\\odot$ lies five standard deviations away from the known Galactic population mean. In the standard common envelope scenario, the immediate progenitor of GW190425 is a close binary system composed of an NS and a He-rich star. With the detailed binary evolutionary modeling, we find that in order to reproduce GW190425-like events, super-Eddington accretion (e.g., $1,000\\,\\dot{M}_{\\rm Edd}$) from a He-rich star onto the first-born NS with a typical mass of 1.33 $M_\\odot$ via stable Case BB mass transfer (MT) is necessarily required. Furthermore, the immediate progenitors should potentially have an initial mass of $M_{\\rm ZamsHe}$ in a range of $3.0-3.5$ $M_\\odot$ and an initial orbital period of $P_{\\rm init}$ from 0.08 days to 0.12 days, respectively. The corresponding mass accreted onto NSs via stable Case BB MT phase varies from $0.70\\, M_\\odot$ to $0.77\\, M_\\odot$. After the formation of the second-born NS, the BNSs are expected to be merged due to gravitational wave emission from $\\sim$ 11 Myr to $\\sim$ 190 Myr.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-09-11T01:39:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "super-eddington accretion",
      "form gw190425",
      "case bb mass transfer",
      "case bb mt phase varies",
      "he-rich star"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}