{
  "abstract": "Terminal mass-loss in massive stars is commonly reconstructed from observations of circumstellar interaction in core-collapse supernovae (CCSNe); however, such signatures can be easily missed depending on the phase when they appear. In this paper, we present a multi-wavelength study of SN\\,2022yyz, a nearby CCSN selected by its luminous late-time mid-infrared (MIR) excess in NEOWISE at $> 500$ days after the discovery. Classified as a Type II SN at discovery, it reached a peak bolometric luminosity of $1.3^{+0.7}_{-0.4}\\times10^{43}$ erg s$^{-1}$ before fading away with a light-curve drop at $\\sim 300$ days. We present late-time HST/WFC3 ultraviolet (UV) imaging and Keck/LRIS spectroscopy at $\\sim 1200$ days, which reveal clear signs of circumstellar-medium (CSM) interaction via a UV excess consistent with a strong MgII contribution and a flat-topped H$α$ profile. We show that the bolometric light curve and the late-time UV luminosity can be explained using a semi-analytic CSM interaction model involving a broken power-law density profile: with $\\sim 2.7~M_\\odot$ of nearby, dense CSM within a radius of $\\sim 10^{16}$ cm surrounded by wind-like outer CSM with a mass-loss rate of $\\sim 10^{-4} {\\rm ~M_\\odot~yr}^{-1}$. The broken density profile indicates $\\gtrsim 100\\times$ mass-loss rate enhancement starting a few hundred years before explosion, pointing to a possible common-envelope ejection in a binary system. Despite being overlooked for follow-up at such proximity, our results demonstrate that IR photometric selection methods provide a powerful way of mapping terminal mass-loss in massive stars - laying the groundwork for the Roman Space Telescope surveys.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.09520",
  "author_total": 9,
  "authors": [
    {
      "name": "Kohki Uno"
    },
    {
      "name": "Kishalay De"
    },
    {
      "name": "Geoffrey Mo"
    },
    {
      "name": "Viraj Karambelkar"
    },
    {
      "name": "Kaitlyn Shin"
    },
    {
      "name": "Christoffer Fremling"
    },
    {
      "name": "Jesper Sollerman"
    },
    {
      "name": "Daichi Hiramatsu"
    },
    {
      "name": "Jacob E. Jencson"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4ynxap8zw5zw1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.09520",
  "fulltext_url": null,
  "id": "4ynxap8zw5zw1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.09520",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ],
    [
      "openalex",
      "3103|Gamma-ray bursts and supernovae"
    ]
  ],
  "openalex": "W7212182289",
  "pdf_url": "https://arxiv.org/pdf/2609.09520",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4ynxap8zw5zw1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.09520",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09520"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "Multi-Wavelength Identification of a Luminous Mid-Infrared Supernova Powered by Circumstellar Interaction with Binary-Driven Pre-supernova Mass Loss",
  "title_text": "Multi-Wavelength Identification of a Luminous Mid-Infrared Supernova Powered by Circumstellar Interaction with Binary-Driven Pre-supernova Mass Loss",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:12Z",
  "url": "https://research.draconitic.com/paper/4ynxap8zw5zw1",
  "venue": "arXiv",
  "versions": []
}