{
  "abstract": "We present a multiepoch, primarily X-ray study of the narrow-line Seyfert 1 (NLSy1) galaxy Mrk 766 by combining archival XMM-Newton observations spanning nearly 2 decades together with an XRISM observation obtained during its Performance Verification Phase. We analyzed the absorption and emission features in the soft X-ray spectra from Reflection Grating Spectrometer and EPIC-pn data, revealing a stratified multiphase potentially ionized absorber with a column density varying at a timescale of ∼1 day. The covering fraction shows positive correlation with the continuum flux, however with significant intrinsic scatter, between the epochs. Mrk 766 exhibits a multicomponent Fe K α emission line as revealed by fits to the XRISM data. A quasi-phenomenological model comprising a torus and a broad disk-line component distinguishes the two components and constrains the inner radius of the potential broad-line-emitting disk substructure between R in = 40–60 r g . Analysis of multiple epochs of the Fe K α complex across XMM-Newton observations reveals that the broad component tracks the continuum flux closely and effectively reflects the trend with respect to the continuum. The narrow component is consistent with a distant emitter, potentially the torus. Quasi-simultaneous monitoring with the Neil Gehrels Swift Observatory X-Ray Telescope and UVOT further indicates UV emission lagging the X-rays by 5 . 9 − 5.7 + 4.1 hr, consistent with disk reprocessing of coronal X-ray fluctuations, and corresponds to a light travel distance of up to 10 ³ r g . Overall, our analysis maps the extent of the dynamically evolving absorber, the iron line emitter, and the accretion disk in this highly accreting NLSy1 system.",
  "abstract_shown": true,
  "affiliations": [
    "University of Maryland Baltimore County",
    "Presidency University",
    "Inter-University Centre for Astronomy and Astrophysics (IUCAA)"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Ayon Mondal",
      "orcid": "0009-0007-8215-6031"
    },
    {
      "affs": [
        2
      ],
      "name": "Tathagata Saha",
      "orcid": "0000-0001-5647-3366"
    },
    {
      "affs": [
        1
      ],
      "name": "Arijit Sar",
      "orcid": "0009-0005-6387-4789"
    },
    {
      "affs": [
        1
      ],
      "name": "Ritaban Chatterjee",
      "orcid": "0000-0001-9899-7686"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0bc3ewtdb4ne2.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea83d",
  "fulltext_url": null,
  "id": "0bc3ewtdb4ne2",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea83d",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7213403207",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea83d/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/0bc3ewtdb4ne2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea83d",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea83d"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Dynamic Accretion Disk–Corona Connection and Broad Fe K α Variability in Mrk 766 Revealed by Time-resolved High-resolution X-Ray Spectroscopic Analysis",
  "title_text": "Dynamic Accretion Disk–Corona Connection and Broad Fe K α Variability in Mrk 766 Revealed by Time-resolved High-resolution X-Ray Spectroscopic Analysis",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/0bc3ewtdb4ne2",
  "venue": "The Astrophysical Journal",
  "versions": [
    {
      "doi": "10.48550/arxiv.2609.16151",
      "pid": "0kvf0178gjnwe",
      "relation": "preprint",
      "title": "Dynamic Accretion Disk-Corona Connection and Broad Fe K$α$ Variability in Mrk 766 Revealed by Time-Resolved High Resolution X-Ray Spectroscopic Analysis",
      "venue": "arXiv"
    }
  ]
}