{
  "id": "2304.13873",
  "version": "v1",
  "published": "2023-04-26T23:40:28.000Z",
  "updated": "2023-04-26T23:40:28.000Z",
  "title": "Chemical Differentiation around Five Massive Protostars Revealed by ALMA -Carbon-Chain Species, Oxygen-/Nitrogen-Bearing Complex Organic Molecules-",
  "authors": [
    "Kotomi Taniguchi",
    "Liton Majumdar",
    "Paola Caselli",
    "Shigehisa Takakuwa",
    "Tien-Hao Hsieh",
    "Masao Saito",
    "Zhi-Yun Li",
    "Kazuhito Dobashi",
    "Tomomi Shimoikura",
    "Fumitaka Nakamura",
    "Jonathan C. Tan",
    "Eric Herbst"
  ],
  "comment": "Accepted by the publication for The Astrophysical Journal Supplement Series, 32 pages,18 figures, 11 tables",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "We present Atacama Large Millimeter/submillimeter Array Band 3 data toward five massive young stellar objects (MYSOs), and investigate relationships between unsaturated carbon-chain species and saturated complex organic molecules (COMs). An HC$_{5}$N ($J=35-34$) line has been detected from three MYSOs, where nitrogen(N)-bearing COMs (CH$_{2}$CHCN and CH$_{3}$CH$_{2}$CN) have been detected. The HC$_{5}$N spatial distributions show compact features and match with a methanol (CH$_{3}$OH) line with an upper-state energy around 300 K, which should trace hot cores. The hot regions are more extended around the MYSOs where N-bearing COMs and HC$_{5}$N have been detected compared to two MYSOs without these molecular lines, while there are no clear differences in the bolometric luminosity and temperature. We run chemical simulations of hot-core models with a warm-up stage, and compare with the observational results. The observed abundances of HC$_{5}$N and COMs show good agreements with the model at the hot-core stage with temperatures above 160 K. These results indicate that carbon-chain chemistry around the MYSOs cannot be reproduced by warm carbon-chain chemistry, and a new type of carbon-chain chemistry occurs in hot regions around MYSOs.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-04-26T23:40:28.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "oxygen-/nitrogen-bearing complex organic",
      "carbon-chain species",
      "chemical differentiation",
      "massive protostars",
      "carbon-chain chemistry"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 32,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}