{
  "abstract": "Results. We identify 45 CLAGNs, of which 40 are newly reported. The sample is dominated by turn-off events, comprising 43 turn-off and 2 turn-on sources. This may be because Type 2 AGNs either lack a detectable broad-line region or have their broad emission lines obscured by circumnuclear dust, making turn-on events more difficult to identify. Using DESI spectra as a third spectroscopic epoch, we identified 12 RCLAGNs. Of the 14 newly identified CLAGNs with three-epoch spectroscopic coverage, 7 objects, i.e. 50%, are confirmed as RCLAGNs. In the previously reported sample, 5 out of 16 objects with available DESI spectra, corresponding to ~31%, exhibit repeating CL behaviour. The relatively high incidence of repeated CL behaviour suggests that CL transitions are associated with recurrent physical processes, such as accretion-rate fluctuations or accretion-disk instabilities. In the logM_BH--log(L_bol/L_Edd) plane, the RCLAGNs display a clear high--low--high accretion-state evolution, indicating a close connection between repeated CL behaviour and recurrent variations in accretion power. The rest-frame upper limits on the transition timescales are ~10 yr for the first transition and 4 yr for the second transition.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: A&A, 714, A157 (2026)",
  "arxiv": "2605.24429",
  "author_total": 7,
  "authors": [
    {
      "name": "Guohai Chen"
    },
    {
      "name": "Wenxin Yang"
    },
    {
      "name": "Xuhong Ye"
    },
    {
      "name": "Zhiqiang Chen"
    },
    {
      "name": "Zhiyuan Pei"
    },
    {
      "name": "Hubing Xiao"
    },
    {
      "name": "Junhui Fan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3yr322z05kpb8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.24429",
  "fulltext_url": null,
  "id": "3yr322z05kpb8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.24429",
  "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.GA"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.24429",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3yr322z05kpb8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2605.24429",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.24429"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Changing-look Active Galactic Nuclei from SDSS, LAMOST and DESI Surveys",
  "title_text": "Changing-look Active Galactic Nuclei from SDSS, LAMOST and DESI Surveys",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/3yr322z05kpb8",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202661767",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}