{
  "abstract": "SN 2024aecx is a nearby, rapidly evolving stripped-envelope supernova with a prominent double-peaked ultraviolet–optical light curve. We model its multiband evolution with an extended version of TransFit , in which the early shock-cooling emission and the subsequent radioactive heating are treated within a single time-dependent radiative diffusion calculation. To describe the stratified ejecta required by the early shock-cooling emission, we adopt compact inner ejecta connected to a dilute extended outer envelope and fit the outer density slope directly from the early light curve. The model reproduces the short-lived first peak, the rise to the radioactive main peak, and the overall multiband evolution. We infer an effective outer radius of R 0 = 264.1 4 − 87.50 + 139.86 R ⊙ , an ejecta mass of M ej = 3.0 1 − 0.47 + 0.74 M ⊙ , a nickel mass of M Ni = 0.1 6 − 0.01 + 0.02 M ⊙ , and a steep outer density slope of n out = 14.6 8 − 0.51 + 0.24 . The steep outer profile favors a low-mass extended envelope, while the inferred ejecta mass is consistent with the rapid evolution of the main peak. However, a control model with standard γ -ray leakage fades too slowly after maximum. We therefore introduce an effective optical-output factor to quantify the additional late-time suppression of the ultraviolet–optical luminosity. These results support the shock-cooling plus radioactive-heating interpretation of SN 2024aecx, but show that its rapid optical decline requires physics beyond the simplest radioactive-diffusion prescription.",
  "abstract_shown": true,
  "affiliations": [
    "Central China Normal University",
    "Education Research and Application Cente",
    "University of Chinese Academy of Sciences",
    "Chinese Academy of Sciences",
    "Beijing Normal University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 7,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Na Wei",
      "orcid": "0009-0006-3261-6418"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Yu-Hao Zhang",
      "orcid": "0009-0000-2423-6825"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Liang-Duan Liu",
      "orcid": "0000-0002-8708-0597"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Guang-Lei Wu",
      "orcid": "0000-0001-8744-3813"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Jing-Yao Li",
      "orcid": "0009-0004-9719-272X"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Yun-Wei Yu",
      "orcid": "0000-0002-1067-1911"
    },
    {
      "affs": [
        2,
        3,
        4
      ],
      "name": "Ning-Chen Sun",
      "orcid": "0000-0002-4731-9698"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1sm11ne5fx6hc.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea6a9",
  "fulltext_url": null,
  "id": "1sm11ne5fx6hc",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6a9",
  "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|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7215083235",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6a9/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/1sm11ne5fx6hc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea6a9",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea6a9"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Gamma-ray bursts and supernovae",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Coupled Shock Cooling and Radioactive Heating in SN 2024aecx: An Extended Envelope and Rapid Optical Decline",
  "title_text": "Coupled Shock Cooling and Radioactive Heating in SN 2024aecx: An Extended Envelope and Rapid Optical Decline",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/1sm11ne5fx6hc",
  "venue": "The Astrophysical Journal",
  "versions": []
}