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    "story_id": "mp-2026-09-17-019",
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    "headline": "Seconds of MIRI Exposure Reached the Sub-Jupiter Regime",
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    "dek": "A surprise companion in calibration data exposed a short, noncoronagraphic route to nearby cold planets.",
    "summary": "A surprise companion in calibration data exposed a short, noncoronagraphic route to nearby cold planets.",
    "body_text": "Short JWST/MIRI calibration images revealed a stellar companion 1.3 arcseconds from HD 101452 with a mid-infrared flux ratio near 27×, disqualifying the system as a single-star calibrator. Contrast curves indicate that 17–42-second, noncoronagraphic integrations could detect sub-Jupiter-mass planets at Solar-System-like separations around a subset of nearby stars when a closely brightness-matched reference is available. The planet sensitivities are predictions from these data, not new planet detections.",
    "why_it_matters": "A surprise companion in calibration data exposed a short, noncoronagraphic route to nearby cold planets.",
    "limitations": [
      "The planet sensitivities are predictions from these data, not new planet detections."
    ],
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    "first_published_at": "2026-09-17T09:00:00.000-04:00",
    "modified_at": "2026-09-17T09:00:00.000-04:00",
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        "qualification": "The planet sensitivities are predictions from these data, not new planet detections."
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    "tags": [
      "JWST",
      "direct imaging",
      "exoplanets"
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    "image_url": null,
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  "sources": [
    {
      "source_id": "source-2026-09-17-021",
      "title": "arXiv preprint 2609.19133",
      "publisher": "arXiv",
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      "published_at": "2026-09-16T13:55:37.000-04:00",
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    "title": "Seconds of MIRI Exposure Reached the Sub-Jupiter Regime",
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