{
  "abstract": "The microlensing event OGLE-2011-BLG-0950 exhibits the well-known “Planet/Binary” degeneracy, in which distinct lens configurations produce similar light curves but imply substantially different mass ratios between the lens components. A previous study rejected the then-known planetary model because its predicted lens-source relative proper motion was inconsistent with that measured from high-resolution imaging, thereby favoring the stellar-binary interpretation. In this work, we identify a new planetary model for this event that arises from a newly identified degeneracy, simultaneously reproducing the observed light curve and remaining consistent with the high-resolution imaging constraint, leaving the “Planet/Binary” degeneracy unresolved once again. Under this planetary interpretation, combining constraints from the light-curve modeling and high-resolution observations yields a lens system consisting of a ∼1 M ⊙ host star orbited by a ∼1.5 M Jup planet, with a projected separation of about 2 or 8 au, subject to the “Close/Wide” degeneracy. Our reanalysis of the color–magnitude diagram further indicates that the source star has unresolved companions that contribute nonnegligible blended light, highlighting the importance of carefully accounting for source and lens companions in future Roman microlensing analyses. Finally, we show that adopting a single mass–luminosity relation significantly underestimates the uncertainties in the inferred lens properties for host masses ≳1 M ⊙ .",
  "abstract_shown": true,
  "affiliations": [
    "Tsinghua University",
    "Westlake University",
    "University of Warsaw",
    "Westlake Institute for Advanced Study",
    "University of Warwick",
    "NASA Goddard Space Flight Center",
    "University of Maryland",
    "Max-Planck-Institute for Astronomy",
    "Ohio State University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 15,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Jiyuan Zhang",
      "orcid": "0000-0002-1279-0666"
    },
    {
      "affs": [
        1
      ],
      "name": "Weicheng Zang",
      "orcid": "0000-0001-6000-3463"
    },
    {
      "affs": [
        2
      ],
      "name": "Andrzej Udalski",
      "orcid": "0000-0001-5207-5619"
    },
    {
      "affs": [
        1,
        3
      ],
      "name": "Hongjing Yang",
      "orcid": "0000-0003-0626-8465"
    },
    {
      "affs": [
        1
      ],
      "name": "Shude Mao",
      "orcid": "0000-0001-8317-2788"
    },
    {
      "affs": [
        2
      ],
      "name": "Michał K. Szymański",
      "orcid": "0000-0002-0548-8995"
    },
    {
      "affs": [
        2
      ],
      "name": "Igor Soszyński",
      "orcid": "0000-0002-7777-0842"
    },
    {
      "affs": [
        2
      ],
      "name": "Radoslaw Poleski",
      "orcid": "0000-0002-9245-6368"
    },
    {
      "affs": [
        4
      ],
      "name": "Krzysztof Ulaczyk",
      "orcid": "0000-0001-6364-408X"
    },
    {
      "affs": [
        2
      ],
      "name": "Paweł Pietrukowicz",
      "orcid": "0000-0002-2339-5899"
    },
    {
      "affs": [
        2
      ],
      "name": "Szymon Kozłowski",
      "orcid": "0000-0003-4084-880X"
    },
    {
      "affs": [
        2
      ],
      "name": "Jan Skowron",
      "orcid": "0000-0002-2335-1730"
    },
    {
      "affs": [
        2
      ],
      "name": "Przemek Mróz",
      "orcid": "0000-0001-7016-1692"
    },
    {
      "affs": [
        5,
        6
      ],
      "name": "Sean Terry",
      "orcid": "0000-0002-5029-3257"
    },
    {
      "affs": [
        7,
        8
      ],
      "name": "Andrew Gould"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1mxfa8aw94r8x.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-3881/aea291",
  "fulltext_url": null,
  "id": "1mxfa8aw94r8x",
  "issns": [
    "0004-6256",
    "1538-3881"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea291",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7125107279",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea291/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/1mxfa8aw94r8x.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:14Z",
      "native_id": "10.3847/1538-3881/aea291",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-3881/aea291"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950",
  "title_text": "A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:14Z",
  "url": "https://research.draconitic.com/paper/1mxfa8aw94r8x",
  "venue": "The Astronomical Journal",
  "versions": []
}