{
  "abstract": "IC 443 is one of the most extensively studied supernova remnants in the Galaxy, yet the surrounding region remains shrouded in mystery. Here we show that 16 years of Fermi-LAT observations uncover extended gigaelectronvolt gamma-ray emission from G189.6+3.3, a source long hidden in the shadow of the much brighter IC 443. The gamma-ray morphology is consistent with the X-ray shell detected by eROSITA, indicating an origin of the emission in the remnant. Spectral and spatial analyses identify distinct hadronic and leptonic gamma-ray components associated with regions containing and lacking molecular gas, respectively, revealing a clear spatial segregation of these emission mechanisms. In the northern shell boundary, hadronic gamma rays coincide with an Hα filament linked to the S249 ionized hydrogen cloud. Morphological studies, crushed-cloud modelling and ultraviolet observations of this region support gamma-ray production through proton re-acceleration in compressed post-shock gas. The shared-cloud interaction positions G189.6+3.3 at the same distance as IC 443, with a linear separation between the two remnants and a time delay in their explosion events, bolstering the hypothesis that these two remnants are part of a binary system, both resulting from separate supernova events.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "Miltiadis Michailidis"
    },
    {
      "name": "Marianne Lemoine-Goumard"
    },
    {
      "name": "Reinhold Willcox"
    },
    {
      "name": "Stefano Gabici"
    },
    {
      "name": "Niccolò Di Lalla"
    },
    {
      "name": "Nicola Omodei"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9cb12sxk1xrmd.bib",
  "cited_by": 0,
  "doi": "10.1038/s41467-026-74978-x",
  "fulltext_url": null,
  "id": "9cb12sxk1xrmd",
  "issns": [
    "2041-1723",
    "2041-1723"
  ],
  "landing_url": "https://hal.science/hal-05715336v1",
  "language": "en",
  "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": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.phys"
    ],
    [
      "hal",
      "2.phys.phys.phys-gen-ph"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7169865329",
  "pdf_url": "https://hal.science/hal-05715336/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-21",
  "publisher": "Nature Publishing Group",
  "ris": "https://research.draconitic.com/paper/9cb12sxk1xrmd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:43Z",
      "native_id": "hal-05715336",
      "source": "hal",
      "url": "https://hal.science/hal-05715336v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Astrophysics and Cosmic Phenomena",
      "subfield": "high-energy"
    }
  ],
  "title": "Shared cloud interactions unveil a candidate binary-system supernova pair with no known analogue",
  "title_text": "Shared cloud interactions unveil a candidate binary-system supernova pair with no known analogue",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:43Z",
  "url": "https://research.draconitic.com/paper/9cb12sxk1xrmd",
  "venue": "Nature Communications",
  "versions": []
}