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    "title": "Gaia identifies a massive dark companion in the BH3 binary",
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        "title": "Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry",
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      "what_changed": "Gaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation.",
      "scope": "Gaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation. The companion is inferred from orbital motion rather than directly imaged. The astrometric data span roughly half an orbit, use preliminary calibrations and have possible parallax bias; the authors employ a combined spectroscopic solution to mitigate its effect on the mass function. The stellar mass depends on isochrone and extinction models. A compact inner binary containing black holes is not excluded by the observations. Association with an old stellar stream and implications for black-hole formation are interpretations, not direct measurements of the progenitor. The cited preprint precedes the final publication. Credit here is to the Gaia Collaboration; its full list of individual contributors is not shown.",
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            "citation": "Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry",
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      "scope": {
        "description": "The companion is inferred from orbital motion rather than directly imaged. The astrometric data span roughly half an orbit, use preliminary calibrations and have possible parallax bias; the authors employ a combined spectroscopic solution to mitigate its effect on the mass function. The stellar mass depends on isochrone and extinction models. A compact inner binary containing black holes is not excluded by the observations. Association with an old stellar stream and implications for black-hole formation are interpretations, not direct measurements of the progenitor. The cited preprint precedes the final publication. Credit here is to the Gaia Collaboration; its full list of individual contributors is not shown.",
        "domain": "Stellar and galactic astrophysics"
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          "citation": "Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry",
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      "statement": "# Gaia identifies a massive dark companion in the BH3 binary\n\nGaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation.\n\n## Scientific scope\n\nThe companion is inferred from orbital motion rather than directly imaged. The astrometric data span roughly half an orbit, use preliminary calibrations and have possible parallax bias; the authors employ a combined spectroscopic solution to mitigate its effect on the mass function. The stellar mass depends on isochrone and extinction models. A compact inner binary containing black holes is not excluded by the observations. Association with an old stellar stream and implications for black-hole formation are interpretations, not direct measurements of the progenitor. The cited preprint precedes the final publication. Credit here is to the Gaia Collaboration; its full list of individual contributors is not shown.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\n\n\nCredit belongs to the cited collaborations. The individual author list is incomplete; no sole discoverer or individual effort share is inferred.\n\n\n\n## Original sources\n\n- [Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry](https://arxiv.org/pdf/2404.10486v1)\n",
      "summary": "Gaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation.",
      "title": "Gaia identifies a massive dark companion in the BH3 binary"
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    "id": "gaia-bh3-dormant-black-hole-astrometric-binary-2024",
    "entry_id": "gaia-bh3-dormant-black-hole-astrometric-binary-2024",
    "revision": 1,
    "title": "Gaia identifies a massive dark companion in the BH3 binary",
    "context": "Stellar and galactic astrophysics",
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    "what_changed": "Gaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation.",
    "scope": "Gaia’s preliminary astrometric binary solution identified a metal-poor giant in an approximately 11.6-year orbit around an unseen massive companion. Gaia radial velocities and ground-based spectroscopy supported the orbital solution. Assuming the visible star’s modeled mass and a single dark companion, the team inferred a companion mass of 32.70±0.82 solar masses and identified a dormant black hole as the simplest explanation. The companion is inferred from orbital motion rather than directly imaged. The astrometric data span roughly half an orbit, use preliminary calibrations and have possible parallax bias; the authors employ a combined spectroscopic solution to mitigate its effect on the mass function. The stellar mass depends on isochrone and extinction models. A compact inner binary containing black holes is not excluded by the observations. Association with an old stellar stream and implications for black-hole formation are interpretations, not direct measurements of the progenitor. The cited preprint precedes the final publication. Credit here is to the Gaia Collaboration; its full list of individual contributors is not shown.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The companion is inferred from orbital motion rather than directly imaged. The astrometric data span roughly half an orbit, use preliminary calibrations and have possible parallax bias; the authors employ a combined spectroscopic solution to mitigate its effect on the mass function. The stellar mass depends on isochrone and extinction models. A compact inner binary containing black holes is not excluded by the observations. Association with an old stellar stream and implications for black-hole formation are interpretations, not direct measurements of the progenitor. The cited preprint precedes the final publication. Credit here is to the Gaia Collaboration; its full list of individual contributors is not shown.",
    "references": [
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        "title": "Discovery of a dormant 33 solar-mass black hole in pre-release Gaia astrometry",
        "url": "https://arxiv.org/pdf/2404.10486v1",
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