{
  "$schema": "https://themachinepress.com/schemas/story-v1.schema.json",
  "schema_version": "1.0.0",
  "document_type": "machine_press_story",
  "story": {
    "story_id": "mp-2026-09-16-027",
    "source_story_id": "tmp-story-ngts10ab-cloud-heat-front-rail",
    "edition_id": "mp-2026-09-16-morning-0069",
    "edition_url": "https://themachinepress.com/edition/2026-09-16",
    "position": 16,
    "story_type": "dispatch",
    "section": "research",
    "editorial_classification": "editorial",
    "headline": "A Hot Jupiter's Clouds Vanished Where Its Dayside Burned Hottest",
    "slug": "a-hot-jupiter-s-clouds-vanished-where-its-dayside-burned-hottest",
    "dek": "JWST separated reflected light from heat and measured transport becoming 7.1 ± 1.9 degrees more efficient per pressure decade.",
    "summary": "JWST separated reflected light from heat and measured transport becoming 7.1 ± 1.9 degrees more efficient per pressure decade.",
    "body_text": "A phase curve follows a planet through its orbit, mixing reflected starlight with thermal emission. JWST's NIRSpec PRISM separated those components for NGTS-10 Ab from 0.5 to 5.5 micrometers, producing joint temperature and reflectance maps. The two were anti-correlated: models best explained the pattern with micron-scale silicate clouds evaporating across the hottest eastern substellar region and weak atmospheric drag. The thermal offset changed by 7.1 ± 1.9 degrees per pressure decade, indicating stronger heat transport deeper in the atmosphere. The interpretation depends on retrieval and circulation models rather than direct images of clouds.",
    "why_it_matters": "JWST separated reflected light from heat and measured transport becoming 7.1 ± 1.9 degrees more efficient per pressure decade.",
    "limitations": [],
    "importance": 9,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-16-027/a-hot-jupiter-s-clouds-vanished-where-its-dayside-burned-hottest",
    "json_url": "https://themachinepress.com/story/mp-2026-09-16-027.json",
    "first_published_at": "2026-09-16T09:00:00.000-04:00",
    "modified_at": "2026-09-16T09:00:00.000-04:00",
    "content_status": "new",
    "is_carryover": false,
    "carryover_reason": null,
    "key_claims": [
      {
        "claim_id": "claim-mp-2026-09-16-027-001",
        "text": "JWST separated reflected light from heat and measured transport becoming 7.1 ± 1.9 degrees more efficient per pressure decade.",
        "source_ids": [
          "source-2026-09-16-016"
        ],
        "qualification": null
      }
    ],
    "source_ids": [
      "source-2026-09-16-016"
    ],
    "tags": [
      "JWST",
      "hot Jupiter",
      "atmospheric circulation"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-16-016",
      "title": "arXiv preprint 2609.16115",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.16115",
      "canonical_url": "https://arxiv.org/abs/2609.16115",
      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-14T20:00:00.000-04:00",
      "accessed_at": "2026-09-16T08:18:00.000-04:00",
      "supports_claim_ids": [
        "claim-mp-2026-09-16-027-001"
      ]
    }
  ],
  "corrections": [],
  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
  },
  "cite_this_report": {
    "title": "A Hot Jupiter's Clouds Vanished Where Its Dayside Burned Hottest",
    "publisher": "The Machine Press",
    "published_at": "2026-09-16T09:00:00.000-04:00",
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-16-027/a-hot-jupiter-s-clouds-vanished-where-its-dayside-burned-hottest"
  }
}