{
  "abstract": "We present the Atacama Large Millimeter/submillimeter Array (ALMA) and the NOrthern Extended Millimeter Array (NOEMA) observations of the molecular outflow from the high-mass young stellar object (HMYSO) G24.33+0.14, which has recently undergone an accretion burst. CO (2–1) and SiO (5–4) reveal a bipolar outflow with pronounced asymmetry and multiple shells, indicating episodic mass ejection. CO reaches projected velocities up to ∼150 km s ⁻¹ , placing the outflow in the extremely high-velocity (EHV) regime. Position–velocity (PV) diagrams show distinct Hubble-wedge structures, and high-velocity CO knots cluster into two separate wedges, supporting nonsteady, multiepoch ejection. Crucially, CH ₃ CN ( J = 12–11, K = 0–4) emission is detected along the outflow axis and spatially coincides with SiO (5–4). Its velocity gradient aligns with the outflow, rather than the disk, and the derived rotational temperatures have a median value of 135 K, which, together with its spatial and kinematic association with SiO, supports a shock-related origin of the CH ₃ CN emission. Comparison of burst-phase (ALMA 2019) and postburst (NOEMA 2020) data shows significant intensity variations in CO and CH ₃ OH masers, confirming that accretion bursts modify outflow physical conditions on observable timescales. These results support a possible connection between episodic accretion, shock chemistry, and extreme-velocity mass ejection in a massive protostar.",
  "abstract_shown": true,
  "affiliations": [
    "Guangzhou University",
    "Changsha Normal University",
    "Peking University",
    "Chinese Academy of Sciences"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Xiaoyun Xu",
      "orcid": "0009-0001-3487-1870"
    },
    {
      "affs": [
        0
      ],
      "name": "Xi Chen",
      "orcid": "0000-0002-5435-925X"
    },
    {
      "affs": [
        1
      ],
      "name": "Yang Yang",
      "orcid": "0000-0002-2895-7707"
    },
    {
      "affs": [
        2
      ],
      "name": "Gregory Herczeg",
      "orcid": "0000-0002-7154-6065"
    },
    {
      "affs": [
        3
      ],
      "name": "Andrej M. Sobolev",
      "orcid": "0000-0001-7575-5254"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2403r0k9y2r2w.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea6c1",
  "fulltext_url": null,
  "id": "2403r0k9y2r2w",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c1",
  "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": [
    [
      "openalex",
      "3103|Astrophysics and Star Formation Studies"
    ]
  ],
  "openalex": "W7221170667",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c1/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/2403r0k9y2r2w.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea6c1",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6c1"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Astrophysics and Star Formation Studies",
      "subfield": "stellar"
    }
  ],
  "title": "Episodic Accretion Drives an Ultrafast Outflow and CH ₃ CN Shock Chemistry in G24.33+0.14",
  "title_text": "Episodic Accretion Drives an Ultrafast Outflow and CH ₃ CN Shock Chemistry in G24.33+0.14",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/2403r0k9y2r2w",
  "venue": "The Astrophysical Journal",
  "versions": []
}