{
  "abstract": "AT2019aalc is considered a repeating tidal disruption event (TDE) candidate occurring in an active galactic nucleus (AGN). In this paper, we highlight previously unnoticed but intriguing features that include a brief optical dimming prior to the rise of the main flare and a significantly lower post-flare luminosity compared to the pre-flare level. By applying a time-dependent obscured TDE model to AT2019aalc, we successfully reproduce its light curves with the tidal disruption of a $1.122_{-0.176}^{+0.246}\\rm M_\\odot$ main-sequence star by a $1.862_{-0.259}^{+0.255} \\times 10^7{\\rm M_\\odot}$ supermassive black hole (SMBH). Both the pre-flare dimming and the reduced post-flare luminosity are attributed to obscuration of the intrinsic AGN emission. The total energy of the event derived from our fit is $1.24\\times10^{51}$ ergs and about 0.2 ${\\rm M_\\odot}$ of debris mass is accreted by the SMBH. In addition, the $g-r$ color of the net flare in AT2019aalc exhibits a continuous reddening trend during the first flare, consistent with a gradual increase in $E(B-V)$ predicted by the obscured TDE model. These results suggest that AT2019aalc can be considered a second member of the recently proposed class of obscured TDE candidates hosted in AGNs. } \\keywords{galaxies: active-galaxies: nuclei-quasars: supermassive black holes-quasars: individual (AT2019aalc)-transients: tidal disruption events.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.24005",
  "author_total": 4,
  "authors": [
    {
      "name": "Ying Gu"
    },
    {
      "name": "Xiao Li"
    },
    {
      "name": "Xue-Guang Zhang"
    },
    {
      "name": "En-Wei Liang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1b52aygdcpz7p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.24005",
  "fulltext_url": null,
  "id": "1b52aygdcpz7p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.24005",
  "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"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.24005",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1b52aygdcpz7p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.24005",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.24005"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "AT2019aalc: An obscured tidal disruption event candidate in an active galactic nucleus revealed by its first flare?",
  "title_text": "AT2019aalc: An obscured tidal disruption event candidate in an active galactic nucleus revealed by its first flare?",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/1b52aygdcpz7p",
  "venue": "arXiv",
  "versions": []
}