{
  "id": "2102.10218",
  "version": "v1",
  "published": "2021-02-20T00:40:36.000Z",
  "updated": "2021-02-20T00:40:36.000Z",
  "title": "Carbon-Chain Chemistry vs. Complex-Organic-Molecule Chemistry in Envelopes around Three Low-Mass Young Stellar Objects in the Perseus Region",
  "authors": [
    "Kotomi Taniguchi",
    "Liton Majumdar",
    "Shigehisa Takakuwa",
    "Masao Saito",
    "Dariusz C. Lis",
    "Paul F. Goldsmith",
    "Eric Herbst"
  ],
  "comment": "Accepted by The Astrophysical Journal, 13 pages, 5 figures, 7 tables",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We have analyzed ALMA Cycle 5 data in Band 4 toward three low-mass young stellar objects (YSOs), IRAS 03235+3004 (hereafter IRAS 03235), IRAS 03245+3002 (IRAS 03245), and IRAS 03271+3013 (IRAS 03271), in the Perseus region. The HC$_{3}$N ($J=16-15$; $E_{\\rm {up}}/k = 59.4$ K) line has been detected in all of the target sources, while four CH$_{3}$OH lines ($E_{\\rm {up}}/k = 15.4-36.3$ K) have been detected only in IRAS 03245. Sizes of the HC$_{3}$N distributions ($\\sim 2930-3230$ au) in IRAS 03235 and IRAS 03245 are similar to those of the carbon-chain species in the warm carbon chain chemistry (WCCC) source L1527. The size of the CH$_{3}$OH emission in IRAS 03245 is $\\sim 1760$ au, which is slightly smaller than that of HC$_{3}$N in this source. We compare the CH$_{3}$OH/HC$_{3}$N abundance ratios observed in these sources with predictions of chemical models. We confirm that the observed ratio in IRAS 03245 agrees with the modeled values at temperatures around 30--35 K, which supports the HC$_{3}$N formation by the WCCC mechanism. In this temperature range, CH$_{3}$OH does not thermally desorb from dust grains. Non-thermal desorption mechanisms or gas-phase formation of CH$_{3}$OH seem to work efficiently around IRAS 03245. The fact that IRAS 03245 has the highest bolometric luminosity among the target sources seems to support these mechanisms, in particular the non-thermal desorption mechanisms.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-02-20T00:40:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "low-mass young stellar objects",
      "perseus region",
      "complex-organic-molecule chemistry",
      "carbon-chain chemistry",
      "non-thermal desorption mechanisms"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}