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    "story_id": "mp-2026-09-12-026",
    "source_story_id": "tmp-story-wide-binaries-white-dwarf-planet-debris",
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    "headline": "Wide Binary White Dwarfs Held Half as Much Planet Debris",
    "slug": "wide-binary-white-dwarfs-held-half-as-much-planet-debris",
    "dek": "DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.",
    "summary": "DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.",
    "body_text": "Metals in a cool white-dwarf atmosphere are evidence of recently accreted planetary material. In DESI DR1, 9.8 ± 2.1% of cool white dwarfs in wide binaries were metal enriched, compared with 20.5 ± 0.9% of matched single systems, a reported 4.7-sigma difference. The authors also found tentative trends with projected separation and temperature. They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes.",
    "why_it_matters": "DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.",
    "limitations": [
      "They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes."
    ],
    "importance": 8,
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    "first_published_at": "2026-09-12T09:00:00.000-04:00",
    "modified_at": "2026-09-12T09:00:00.000-04:00",
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        "text": "DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.",
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        "qualification": "They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes."
      }
    ],
    "source_ids": [
      "source-2026-09-12-015"
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    "tags": [
      "white dwarfs",
      "binary stars",
      "planetary systems"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-12-015",
      "title": "arXiv preprint 2609.11798",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.11798",
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      "source_type": "primary_research",
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      "published_at": null,
      "accessed_at": "2026-09-12T08:27:00.000-04:00",
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    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "Wide Binary White Dwarfs Held Half as Much Planet Debris",
    "publisher": "The Machine Press",
    "published_at": "2026-09-12T09:00:00.000-04:00",
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