{
  "id": "1312.0724",
  "version": "v1",
  "published": "2013-12-03T07:57:14.000Z",
  "updated": "2013-12-03T07:57:14.000Z",
  "title": "A recent accretion burst in the low-mass protostar IRAS 15398-3359: ALMA imaging of its related chemistry",
  "authors": [
    "Jes K. Jorgensen",
    "Ruud Visser",
    "Nami Sakai",
    "Edwin A. Bergin",
    "Christian Brinch",
    "Daniel Harsono",
    "Johan E. Lindberg",
    "Ewine F. van Dishoeck",
    "Satoshi Yamamoto",
    "Suzanne E. Bisschop",
    "Magnus V. Persson"
  ],
  "comment": "Accepted for publication in ApJ Letters; 14 pages, 5 figures",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "Low-mass protostars have been suggested to show highly variable accretion rates through-out their evolution. Such changes in accretion, and related heating of their ambient envelopes, may trigger significant chemical variations on different spatial scales and from source-to-source. We present images of emission from C17O, H13CO+, CH3OH, C34S and C2H toward the low-mass protostar IRAS 15398-3359 on 0.5\" (75 AU diameter) scales with the Atacama Large Millimeter/submillimeter Array (ALMA) at 340 GHz. The resolved images show that the emission from H13CO+ is only present in a ring-like structure with a radius of about 1-1.5\" (150-200 AU) whereas the CO and other high dipole moment molecules are centrally condensed toward the location of the central protostar. We propose that HCO+ is destroyed by water vapor present on small scales. The origin of this water vapor is likely an accretion burst during the last 100-1000 years increasing the luminosity of IRAS 15398-3359 by a factor of 100 above its current luminosity. Such a burst in luminosity can also explain the centrally condensed CH3OH and extended warm carbon-chain chemistry observed in this source and furthermore be reflected in the relative faintness of its compact continuum emission compared to other protostars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-12-03T07:57:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "low-mass protostar iras",
      "accretion burst",
      "related chemistry",
      "variable accretion rates through-out",
      "alma imaging"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/2041-8205/779/2/L22",
      "journal": "The Astrophysical Journal",
      "year": 2013,
      "month": "Dec",
      "volume": 779,
      "number": 2
    },
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013ApJ...779L..22J"
    }
  }
}