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    "story_id": "mp-2026-10-28-019",
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    "headline": "Two Blazars Add a Second Radio Rhythm",
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    "dek": "Long monitoring records show candidate 2:1 periodicities in PKS J0805-0111 and PKS 2131-021, adding potential corroboration for binary interpretations.",
    "summary": "Long monitoring records show candidate 2:1 periodicities in PKS J0805-0111 and PKS 2131-021, adding potential corroboration for binary interpretations.",
    "body_text": "The reported harmonic structure follows an earlier 2:1 candidate in J1309+1154 and could help distinguish physical periodicity from correlated noise in long blazar light curves. The authors present several possible models and arguments for and against the signals. These remain supermassive-black-hole-binary candidates, not confirmed binaries.",
    "why_it_matters": "Long monitoring records show candidate 2:1 periodicities in PKS J0805-0111 and PKS 2131-021, adding potential corroboration for binary interpretations.",
    "limitations": [
      "These remain supermassive-black-hole-binary candidates, not confirmed binaries."
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    "first_published_at": "2026-10-28T09:00:00.000-04:00",
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        "text": "Long monitoring records show candidate 2:1 periodicities in PKS J0805-0111 and PKS 2131-021, adding potential corroboration for binary interpretations.",
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        "qualification": "These remain supermassive-black-hole-binary candidates, not confirmed binaries."
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    "tags": [
      "black holes",
      "radio astronomy",
      "blazars",
      "time series"
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  "sources": [
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      "source_id": "source-2026-10-28-021",
      "title": "arXiv preprint 2610.36732, original v1",
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    "title": "Two Blazars Add a Second Radio Rhythm",
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