{
  "id": "0909.3589",
  "version": "v1",
  "published": "2009-09-21T04:28:22.000Z",
  "updated": "2009-09-21T04:28:22.000Z",
  "title": "On the oxygen isotopic composition of the Solar System",
  "authors": [
    "Eric Gaidos",
    "Alexander N. Krot",
    "Gary R. Huss"
  ],
  "comment": "accepted to ApJ Letters",
  "categories": [
    "astro-ph.SR",
    "astro-ph.EP"
  ],
  "abstract": "The 18O/17O ratio of the Solar System is 5.2 while that of the interstellar medium (ISM) and young stellar objects is ~4. This difference cannot be explained by pollution of the Sun's natal molecular cloud by 18O-rich supernova ejecta because (1) the necessary B-star progenitors live longer than the duration of star formation in molecular clouds; (2) the delivery of ejecta gas is too inefficient and the amount of dust in supernova ejecta is too small compared to the required pollution (2% of total mass or ~20% of oxygen); and (3) the predicted amounts of concomitant short-lived radionuclides (SLRs) conflicts with the abundances of 26Al and 41Ca in the early Solar System. Proposals for the introduction of 18O-rich material must also be consistent with any explanation for the origin of the observed slope-one relationship between 17O/16O and 18O/16O in the high-temperature components of primitive meteorites. The difference in 18O/17O ratios can be explained by enrichment of the ISM by the 17O-rich winds of asymptotic giant branch (AGB) stars, the sequestration of comparatively 18O-rich gas from star-forming regions into long-lived, low-mass stars, and a monotonic decrease in the 18O/17O ratio of interstellar gas. At plausible rates of star formation and gas infall, Galactic chemical evolution does not follow a slope-one line in an three-isotope plot, but instead moves along a steeper trajectory towards an 17O-rich state. Evolution of the ISM and star-forming gas by AGB winds also explains the difference in the carbon isotope ratios of the Solar System and ISM.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-09-21T04:28:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "solar system",
      "oxygen isotopic composition",
      "18o/17o ratio",
      "necessary b-star progenitors live longer",
      "supernova ejecta"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/705/2/L163",
      "journal": "The Astrophysical Journal",
      "year": 2009,
      "month": "Nov",
      "volume": 705,
      "number": 2
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 831700,
      "adsabs": "2009ApJ...705L.163G"
    }
  }
}