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    "source_story_id": "tmp-sidebar-hops198-outflow-density-asymmetry",
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    "headline": "One Side of the Outflow Met Denser Gas",
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    "dek": "HOPS 198 opens about 80 degrees eastward but only 30 degrees westward.",
    "summary": "HOPS 198 opens about 80 degrees eastward but only 30 degrees westward.",
    "body_text": "Modeling of the protostellar outflow HOPS 198 attributes its asymmetric cavity chiefly to ambient density: the western core is estimated at 1.5 to 2.8 times the eastern density. The work, accepted by Astronomy & Astrophysics, supports a density-driven opening rather than documenting a transient event.",
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    "tags": [
      "protostars",
      "outflows",
      "star formation"
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    {
      "source_id": "source-2026-08-06-019",
      "title": "arXiv preprint 2608.04890",
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    "title": "One Side of the Outflow Met Denser Gas",
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