{
  "id": "2011.07668",
  "version": "v1",
  "published": "2020-11-16T00:52:31.000Z",
  "updated": "2020-11-16T00:52:31.000Z",
  "title": "A closer look at non-interacting He stars as a channel for producing the old population of Type Ia supernovae",
  "authors": [
    "Zheng-Wei Liu",
    "Richard J. Stancliffe"
  ],
  "comment": "6 pages, 4 figures, published in Astronomy & Astrophysics (A&A)",
  "journal": "A&A 641, A20 (2020)",
  "doi": "10.1051/0004-6361/202038443",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "The nature of the progenitors of type Ia supernovae (SNe Ia) remains a mystery. Binary systems consisting of a white dwarf (WD) and a main-sequence (MS) donor are potential progenitors of SNe Ia, in which a thermonuclear explosion of the WD may occur when its mass reaches the Chandrasekhar limit during accretion of material from a companion star. In the present work, we address theoretical rates and delay times of a specific MS donor channel to SNe Ia, in which a He star+MS binary produced from a common envelope event subsequently forms a WD+MS system without the He star undergoing mass transfer by Roche lobe overflow. By combining the results of self-consistent binary evolution calculations with population synthesis models, we find that the contribution of SNe Ia in this channel is around 2.0e-4 per year. In addition, we find that delay times of SNe Ia in this channel cover a range of about 1.0-2.6 Gyr, and almost all SNe Ia produced in this way (about 97%) have a delay time of > 1 Gyr. While the rate of SN Ia in this work is about 10% of the overall SN Ia rate, the channel represents a possible contribution to the old population (1-3 Gyr) of observed SNe Ia.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-11-16T00:52:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "type ia supernovae",
      "sne ia",
      "old population",
      "closer look",
      "delay time"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}