{
  "abstract": "Space-based astrometric missions such as Hipparcos and Gaia rely on one-dimensional scanning strategies that couple the measured signals with both observation times and scanning geometry. This coupling can introduce spurious periodicities and complicate their interpretation. We present a non-parametric extension of the phase-distance correlation (PDC) periodogram that quantifies and reduces dependence on scan geometry at the period-search stage. Using Hipparcos data, we identified recurrent periodicities associated with characteristic scanning-law timescales and showed that they are strongly suppressed by the scan-angle-controlled statistic. We then applied the method to Gaia Data Release 4 (DR4) prerelease epoch astrometry, where a recurrent ~54-day feature is suppressed across multiple sources while independently known orbital signals remain detectable. The method provides a diagnostic of scan-angle dependence and a way to mitigate its impact on period searches. These results are particularly relevant for Gaia DR4, where public epoch astrometry will enable large-scale searches for companions ranging from exoplanets to dormant black holes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.08282",
  "author_total": 5,
  "authors": [
    {
      "name": "Avraham Binnenfeld"
    },
    {
      "name": "Sahar Shahaf"
    },
    {
      "name": "Richard I. Anderson"
    },
    {
      "name": "Hans-Walter Rix"
    },
    {
      "name": "Shay Zucker"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f7vnvmpagdznz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.08282",
  "fulltext_url": null,
  "id": "f7vnvmpagdznz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.08282",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.EP"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.IM"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.08282",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f7vnvmpagdznz.ris",
  "sources": [
    {
      "first_seen": "2026-11-06T18:21:30Z",
      "native_id": "2611.08282",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.08282"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    }
  ],
  "title": "Mitigating scanning-induced systematics in Hipparcos and implications for Gaia astrometry",
  "title_text": "Mitigating scanning-induced systematics in Hipparcos and implications for Gaia astrometry",
  "type": "preprint",
  "updated_at": "2026-11-09T00:20:41Z",
  "url": "https://research.draconitic.com/paper/f7vnvmpagdznz",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202661484",
      "pid": "2x0tanw8hn8ph",
      "relation": "published-as",
      "title": "Mitigating scanning-induced systematics in Hipparcos andimplications for Gaia astrometry",
      "venue": "Astronomy & Astrophysics"
    }
  ]
}