{
  "id": "1707.07387",
  "version": "v1",
  "published": "2017-07-24T03:22:10.000Z",
  "updated": "2017-07-24T03:22:10.000Z",
  "title": "Merging of a CO WD and a He-rich white dwarf to produce a type Ia supernovae",
  "authors": [
    "Dongdong Liu",
    "Bo Wang",
    "Chengyuan Wu",
    "Zhanwen Han"
  ],
  "comment": "8 pages, 8 figures, accepted for publication in A&A",
  "categories": [
    "astro-ph.SR",
    "astro-ph.HE"
  ],
  "abstract": "Context: Although type Ia supernovae (SNe Ia) play a key role in astrophysics, the companions of the exploding carbon-oxygen white dwarfs (CO WDs) are still not completely identified. It has been suggested recently that a He-rich WD (a He WD or a hybrid HeCO WD) merges with a CO WD may produce an SN Ia. This theory was based on the double-detonation model, in which the shock compression in the CO core caused by the surface explosion of the He-rich shell might lead to the explosion of the whole CO WD. However, so far, very few binary population synthesis (BPS) studies have been made on the merger scenario of a CO WD and a He-rich WD in the context of SNe Ia. Aims: We aim to systematically study the Galactic birthrates and delay-time distributions of SNe Ia based on the merger scenario of a CO WD and a He-rich WD. Methods: We performed a series of Monte Carlo BPS simulations to investigate the properties of SNe Ia from the merging of a CO WD and a He-rich WD based on the Hurley rapid binary evolution code. We also considered the influence of different metallicities on the final results. Results: From our simulations, we found that no more than 15% of all SNe Ia stem from the merger scenario of a CO WD and a He-rich WD, and their delay times range from ~110 Myr to the Hubble time. This scenario mainly contributes to SN Ia explosions with intermediate and long delay times. The present work indicates that the merger scenario of a CO WD and a He-rich WD can roughly reproduce the birthrates of SN 1991bg-like events, and cover the range of their delay times. We also found that SN Ia birthrates from this scenario would be higher for the cases with low metallicities.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-07-24T03:22:10.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "type ia supernovae",
      "he-rich wd",
      "he-rich white dwarf",
      "sne ia",
      "merger scenario"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}