{
  "id": "1611.01301",
  "version": "v1",
  "published": "2016-11-04T09:58:59.000Z",
  "updated": "2016-11-04T09:58:59.000Z",
  "title": "M31N 2008-12a - The Remarkable Recurrent Nova in M31",
  "authors": [
    "M. J. Darnley"
  ],
  "comment": "6 pages, 1 figure, to appear in the proceedings of the 20th European Workshop on White Dwarfs (EuroWD16) held July 25-29th, 2016 at the University of Warwick, United Kingdom",
  "categories": [
    "astro-ph.SR",
    "astro-ph.HE"
  ],
  "abstract": "M31N 2008-12a is a remarkable recurrent nova within the Andromeda Galaxy. With eleven eruptions now identified, including eight in the past eight years, the system exhibits a recurrence period of one year, and possibly just six months. This short inter eruption period is driven by the combination of a high mass white dwarf ($1.38\\,\\mathrm{M}_\\odot$) and high mass accretion rate ($\\sim1.6\\times10^{-7}\\,\\mathrm{M}_\\odot\\,\\mathrm{yr}^{-1}$). Such a high accretion rate appears to be provided by the stellar wind of a red giant companion. Deep H$\\alpha$ observations have revealed the presence of a vastly extended nebula around the system, which could be the `super-remnant' of many thousands of past eruptions. With a prediction of the white dwarf reaching the Chandrasekhar mass in less than a mega-year, M31N 2008-12a has become the leading pre-explosion type Ia supernova candidate. The 2016 eruption - to be the twelfth detected eruption - is expected imminently, and a vast array of follow-up observations are already planned.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-11-04T09:58:59.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "recurrent nova",
      "pre-explosion type ia supernova candidate",
      "short inter eruption period",
      "high mass white dwarf",
      "leading pre-explosion type ia supernova"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}