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    "story_id": "mp-2026-08-03-005",
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    "headline": "A Wild Jupiter May Have Thrown Its Sibling Away",
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    "dek": "Four more years of radial-velocity monitoring sharpened one of the strangest known architectures around an ultra-short-period planet.",
    "summary": "Four more years of radial-velocity monitoring sharpened one of the strangest known architectures around an ultra-short-period planet.",
    "body_text": "A joint analysis of 237 HARPS-N spectra with K2 and TESS photometry refined the outer planet K2-312 c to an 871.32-day orbit, a minimum mass near five Jupiters and eccentricity near 0.85. Simulations show that scattering between two giants could eject one planet, leave the survivor highly eccentric and spare the inner rocky planet. That formation history is plausible, not directly observed.",
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      "That formation history is plausible, not directly observed."
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    "first_published_at": "2026-08-03T09:00:00.000-04:00",
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        "qualification": "That formation history is plausible, not directly observed."
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    "tags": [
      "exoplanets",
      "orbital dynamics",
      "radial velocity"
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      "source_id": "source-2026-08-03-005",
      "title": "Astronomy & Astrophysics: the K2-312 planetary system",
      "publisher": "EDP Sciences",
      "url": "https://doi.org/10.1051/0004-6361/202661259",
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      "accessed_at": "2026-08-03T08:27:38.249-04:00",
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    "title": "A Wild Jupiter May Have Thrown Its Sibling Away",
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