{
  "abstract": "We present Keck/NIRC2 adaptive optics imaging results of planetary microlensing event OGLE-2012-BLG-0563. We find that the OGLE-2012-BLG-0563L planetary system consists of a 1.12 +/- 0.09 Jupiter-mass planet orbiting a 0.81 +/- 0.04 solar-mass host star at a distance of 5.49 +/- 0.56 kpc from the Sun. This event has a lens-source separation of 23.28 +/- 0.48 mas, which is the smallest lens-source separation measured to date with Keck AO data. We find that the incorrect solution - which identifies the Northeast (NE) star as the source star - is favored if one only considers the discovery paper, the Fukui et al. (2015) solution, or an unconstrained model. However, by performing an image-constrained light curve model fit using the relative proper motion direction constraint from the Keck follow-up data, we demonstrate that the correct solution identifies the NE star as the lens star. The discrepancy in the unconstrained models is driven by systematics in the FTS and MOA B & C data, alongside the impact of the relative proper motion direction constraints. This outcome offers two important lessons for future Roman data analysis: (1) thoroughly verify systematics across all passbands and identify the precise origin of chi-squared differences, and (2) utilize image-constrained light curve modeling incorporating relative proper motion direction constraints to identify the correct lens.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.30310",
  "author_total": 14,
  "authors": [
    {
      "name": "Aparna Bhattacharya"
    },
    {
      "name": "David P. Bennett"
    },
    {
      "name": "Jean Phillippe Beaulieu"
    },
    {
      "name": "Ian A. Bond"
    },
    {
      "name": "Kansuke Nunota"
    },
    {
      "name": "Jessica R. Lu"
    },
    {
      "name": "Joshua W. Blackman"
    },
    {
      "name": "Andrew A. Cole"
    },
    {
      "name": "Akihiko Fukui"
    },
    {
      "name": "Jean Baptiste Marquette"
    },
    {
      "name": "Clement Ranc"
    },
    {
      "name": "Natalia Rektsini"
    },
    {
      "name": "Sean K Terry"
    },
    {
      "name": "Aikaterini Vandorou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bexs6wjqxecyc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.30310",
  "fulltext_url": null,
  "id": "bexs6wjqxecyc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.30310",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ],
    [
      "openalex",
      "3103|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7223287313",
  "pdf_url": "https://arxiv.org/pdf/2610.30310",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bexs6wjqxecyc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:34Z",
      "native_id": "2610.30310",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.30310"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "OGLE-2012-BLG-0563: Relative Proper Motion Constraint from Keck Follow-up finds the correct Lens",
  "title_text": "OGLE-2012-BLG-0563: Relative Proper Motion Constraint from Keck Follow-up finds the correct Lens",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:34Z",
  "url": "https://research.draconitic.com/paper/bexs6wjqxecyc",
  "venue": "arXiv",
  "versions": []
}