{
  "id": "2001.09829",
  "version": "v1",
  "published": "2020-01-27T14:45:31.000Z",
  "updated": "2020-01-27T14:45:31.000Z",
  "title": "Common-Envelope Episodes that lead to Double Neutron Star formation",
  "authors": [
    "Alejandro Vigna-Gómez",
    "Morgan MacLeod",
    "Coenraad J. Neijssel",
    "Floor S. Broekgaarden",
    "Stephen Justham",
    "George Howitt",
    "Selma E. de Mink",
    "Ilya Mandel"
  ],
  "comment": "20 pages, 9 figures, submitted version",
  "categories": [
    "astro-ph.SR",
    "astro-ph.HE"
  ],
  "abstract": "Close Double Neutron Stars (DNSs) have been observed as Galactic radio pulsars, while their mergers have been detected as gamma-ray bursts and gravitational-wave sources. They are believed to have experienced at least one common-envelope episode (CEE) during their evolution prior to DNS formation. In the last decades there have been numerous efforts to understand the details of the common-envelope phase, but its computational modelling remains challenging. We present and discuss the properties of the donor and the binary at the onset of the Roche-lobe overflow (RLOF) leading to these CEEs as predicted by rapid binary population synthesis models. These properties can be used as initial conditions for detailed simulations of the common-envelope phase. There are three distinctive populations, classified by the evolutionary stage of the donor at the moment of the onset of the RLOF: giant donors with fully-convective envelopes, cool donors with partially-convective envelopes, and hot donors with radiative envelopes. We also estimate that, for standard assumptions, tides would not circularise a large fraction of these systems by the onset of RLOF. This makes the study and understanding of eccentric mass transferring systems relevant for DNS populations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-01-27T14:45:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "double neutron star formation",
      "common-envelope episode",
      "mass transferring systems relevant",
      "rapid binary population synthesis models",
      "common-envelope phase"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}