{
  "abstract": "We report the Atacama Large Millimeter/submillimeter Array observations of 1.3 mm continuum, C ¹⁸ O ( J = 2−1), and N ₂ D ⁺ ( J = 3−2) toward the millimeter multisystem MMS 2 in the Orion molecular cloud 3 region at an angular resolution of 1 . ″ 59 (∼620 au). MMS 2 is in the flat-spectrum phase, with its protostars in the late stage of the main accretion phase. We detect the centrally condensed structures traced by C ¹⁸ O emission associated with the 1.3 mm continuum sources MMS 2-North and MMS 2-South, which are spatially resolved and unresolved, respectively. The estimated diameter and mass of the centrally condensed structure associated with MMS 2-North are 1 . ″ 64 (∼640 au) and 3.0 × 10 ⁻⁴ M ⊙ , respectively. We also detect an extended structure traced by C ¹⁸ O emission associated with the circumbinary envelope at a scale of 5 . ″ 70 (∼2240 au) with an estimated gas mass of 1.4 × 10 ⁻² M ⊙ . In addition, we detect a filamentary structure traced by N ₂ D ⁺ emission to the south of MMS 2, which is spatially offset from the C ¹⁸ O emission. This offset may be attributed to the influence of the warm surrounding environment.",
  "abstract_shown": true,
  "affiliations": [
    "Chinese Academy of Sciences",
    "National Astronomical Observatory of Japan",
    "The Graduate University for Advanced Studies",
    "Kyushu University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yuhua 玉华 Liu 柳",
      "orcid": "0009-0009-2263-5502"
    },
    {
      "affs": [
        1,
        2
      ],
      "name": "Satoko 橋智子 Takahashi 髙",
      "orcid": "0000-0002-7287-4343"
    },
    {
      "affs": [
        3
      ],
      "name": "Masahiro N. Machida",
      "orcid": "0000-0002-0963-0872"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a57b4kxj2yta1.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea60f",
  "fulltext_url": null,
  "id": "a57b4kxj2yta1",
  "issns": [
    "1538-4357",
    "0004-637X"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea60f",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "astronomy/general"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea60f/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/a57b4kxj2yta1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.3847/1538-4357/aea60f",
      "source": "feed-iop",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea60f"
    },
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea60f",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea60f"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "The Dense Gas Structures around MMS 2/OMC-3 Traced by C18O Emission",
  "title_text": "The Dense Gas Structures around MMS 2/OMC-3 Traced by C18O Emission",
  "type": "peer-reviewed",
  "updated_at": "2026-10-31T00:20:43Z",
  "url": "https://research.draconitic.com/paper/a57b4kxj2yta1",
  "venue": "The Astrophysical Journal",
  "versions": []
}