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    "story_id": "mp-2026-11-04-011",
    "source_story_id": "tmp-story-sn2019qem-mass-loss",
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    "headline": "The Star Shed Nine Suns Two Years Before It Died",
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    "dek": "Models of supernova SN 2019qem point to an extreme pre-collapse eruption and roughly 32 solar masses swept up within 544 days.",
    "summary": "Models of supernova SN 2019qem point to an extreme pre-collapse eruption and roughly 32 solar masses swept up within 544 days.",
    "body_text": "The team combines optical and mid-infrared photometry with 26 spectra spanning 22 days before to 699 days after discovery. SN 2019qem reached an optical bolometric peak of 7.0 × 10^43 ergs per second and radiated 6.9 × 10^50 ergs within 575 days. In the preferred interaction model, about seven solar masses of ejecta hit roughly nine solar masses expelled two years earlier, then a dense wind, sweeping up around 32 solar masses by day 544. The inferred budget suggests a progenitor initially above 40 solar masses. Those numbers depend on the interaction model and adopted wind speed; they reconstruct one unusually luminous Type IIn event.",
    "why_it_matters": "Models of supernova SN 2019qem point to an extreme pre-collapse eruption and roughly 32 solar masses swept up within 544 days.",
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    "first_published_at": "2026-11-04T09:00:00.000-05:00",
    "modified_at": "2026-11-04T09:00:00.000-05:00",
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        "text": "Models of supernova SN 2019qem point to an extreme pre-collapse eruption and roughly 32 solar masses swept up within 544 days.",
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    "tags": [
      "supernova",
      "stellar evolution",
      "mass loss"
    ],
    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-11-04-011",
      "title": "arXiv preprint 2611.05328, original v1",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2611.05328v1",
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      "published_at": "2026-11-03T13:33:01.000-05:00",
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    "title": "The Star Shed Nine Suns Two Years Before It Died",
    "publisher": "The Machine Press",
    "published_at": "2026-11-04T09:00:00.000-05:00",
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