{
  "id": "2012.04890",
  "version": "v1",
  "published": "2020-12-09T07:18:42.000Z",
  "updated": "2020-12-09T07:18:42.000Z",
  "title": "Precise Ages of Field Stars From White Dwarf Companions in Gaia DR2",
  "authors": [
    "Dan Qiu",
    "Hai-Jun Tian",
    "Xi-Dong Wang",
    "Jia-Lu Nie",
    "Ted von Hippe",
    "Gao-Chao Liu",
    "Morgan Fouesneau",
    "Hans-Walter Rix"
  ],
  "comment": "15 pages, 10 figures, 4 tables, accepted for publication in The Astrophysical Journal Supplement Series",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We analyze 4\\,050 wide binary star systems involving a white dwarf (WD) and usually a main sequence (MS) star, drawn from the large sample assembled by \\citet[][hereafter, T20]{Tian_2020}. Using the modeling code BASE-9, we determine the system's ages, the WD progenitors' ZAMS masses, the extinction values ($A_V$), and the distance moduli. Discarding the cases with poor age convergences, we obtain ages for 3\\,551 WDs, with a median age precision of $\\sigma_{\\tau}/\\tau = 20$\\%, and system ages typically in the range of 1-6 Gyr. We validated these ages against the very few known clusters and through cross-validation of 236 WD-WD binaries. Under the assumption that the components are co-eval in a binary system, this provides precise age constraints on the usually low-mass MS companions, mostly inaccessible by any other means.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-12-09T07:18:42.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "white dwarf companions",
      "gaia dr2",
      "field stars",
      "wide binary star systems",
      "usually low-mass ms companions"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}