{
  "abstract": "We present a broadband spectral analysis of the ultracompact X-ray binary (UCXB) 4U 1543–624, using AstroSat observation during 2017 March. The X-ray spectra in the 0.5–25.0 keV energy band are well described by a combination of a multicolor disk component, a single-temperature blackbody emission from the NS surface/BL, a Comptonization component, and a relativistically broad O VIII Ly α emission line. During this observation, a cool disk with kT in ∼ 0.6 keV reached toward the innermost stable circular orbit (ISCO) at a low accretion rate m ̇ / m ̇ E d d ≃ 0.016 . Furthermore, the presence of an O VIII Ly α line confirms the existence of an O-rich accretion disk extending to the ISCO, which challenges the standard accretion disk model. We discussed our results within the framework of a standard accretion disk and advection-dominated accretion flows. Our results are compatible with the condensation-fed inner accretion flows.",
  "abstract_shown": true,
  "affiliations": [
    "Guru Ghasidas Vishwavidyalaya",
    "Xiamen University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 2,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Subhasish Das",
      "orcid": "0000-0001-6877-4393"
    },
    {
      "affs": [
        1
      ],
      "name": "Raj Kumar",
      "orcid": "0000-0003-3469-9895"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7vs67krwkxggn.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea837",
  "fulltext_url": null,
  "id": "7vs67krwkxggn",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea837",
  "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": "W7222970890",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea837/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/7vs67krwkxggn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea837",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea837"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Accretion Geometry of the Ultracompact X-Ray Binary 4U 1543–624: AstroSat View",
  "title_text": "Accretion Geometry of the Ultracompact X-Ray Binary 4U 1543–624: AstroSat View",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/7vs67krwkxggn",
  "venue": "The Astrophysical Journal",
  "versions": []
}