{
  "abstract": "Changing-look active galactic nuclei (CLAGN) exhibit rapid spectral transitions on timescales of months to years, challenging standard AGN unification models and providing unique insight into accretion-disk variability and obscuration processes. Despite their scientific importance, systematic searches for CLAGN remain limited by the scarcity of multi-epoch spectroscopy and the difficulty of constructing large samples efficiently. We introduce CLAS+, a catalog constructed by comparing synthetic photometry derived from DESI DR1 and SDSS DR17 spectra with contemporaneous narrow-band imaging from the S-PLUS survey. Applying our pipeline to a parent sample of 98,139 quasars, we select high-confidence CLAGN candidates above a threshold of reduced chi-squared $χ_r^2 > 15$. We identify 3,554 strong CLAGN candidates, corresponding to 3.6\\% of the parent sample. This selected fraction is conditional on the adopted criterion and should not be interpreted as an intrinsic CLAGN occurrence rate. Cross-matching with existing CLAGN compilations shows that CLAS+ identifies a large population of previously unreported high-priority candidates (3,481). Among the spectroscopic--photometric comparisons with reliable temporal classification, 40\\% are classified as photometric turn-on, 41\\% as intermediate, and 19\\% as turn-off. We also find an apparent redshift dependence in the relative fractions, with photometric turn-on candidates becoming more common at higher redshifts within the CLAS+ selected sample. Therefore, narrow-band photometry provides a powerful and efficient alternative to purely spectroscopic searches for identifying CLAGN candidates at scale. CLAS+ substantially expands the known CLAGN candidate population and provides a valuable target list for future spectroscopic follow-up and time-domain studies with facilities such as Rubin/LSST.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.03232",
  "author_total": 14,
  "authors": [
    {
      "name": "L. Nakazono"
    },
    {
      "name": "L. L. Oliveira"
    },
    {
      "name": "R. R. Valença"
    },
    {
      "name": "P. Sánchez-Sáez"
    },
    {
      "name": "G. Oliveira-Schwarz"
    },
    {
      "name": "N. M. Cardoso"
    },
    {
      "name": "A. L. O'Mill"
    },
    {
      "name": "S. Panda"
    },
    {
      "name": "E. Telles"
    },
    {
      "name": "R. Demarco"
    },
    {
      "name": "W. Schoenell"
    },
    {
      "name": "T. Ribeiro"
    },
    {
      "name": "A. Kanaan"
    },
    {
      "name": "C. Mendes de Oliveira"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1b7g8njb3dp22.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.03232",
  "fulltext_url": null,
  "id": "1b7g8njb3dp22",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.03232",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7208730352",
  "pdf_url": "https://arxiv.org/pdf/2609.03232",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1b7g8njb3dp22.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2609.03232",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.03232"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "CLAS+: A large catalog of Changing-Look AGN candidates selected through S-PLUS narrow-band photometry",
  "title_text": "CLAS+: A large catalog of Changing-Look AGN candidates selected through S-PLUS narrow-band photometry",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/1b7g8njb3dp22",
  "venue": "arXiv",
  "versions": []
}