{
  "abstract": "The interactions between post–asymptotic giant branch (post-AGB) binaries and their circumbinary disks play a central role in shaping the evolution of these systems. Circumbinary disks around post-AGB binaries are stable, though relatively short-lived, structures (10 ⁴ −10 ⁵ yr), and their physical properties and evolution remain poorly understood. In this study, we target IRAS 08544−4431, one of the best-studied post-AGB binaries. This system has well-constrained stellar and orbital parameters, exhibits well-defined characteristic refractory-depleted photospheric chemistry, and hosts a stable, sub-Keplerian circumbinary disk extending from a well-resolved sublimation rim at approximately 8 au to outer radii of approximately 1000 au. We probe the disk layers close to the midplane using Atacama Large Millimeter/submillimeter Array (ALMA) Band 7 continuum and ¹² CO J = 3−2 observations of IRAS 08544−4431 obtained with baselines up to 16.2 km. These data provide the finest angular resolution as yet achieved with ALMA for dust-continuum observations of post-AGB binaries with an (almost) face-on disk (15 au; 10 mas). The resulting map of dust continuum enabled resolving disk inner rim, a largely smooth radial profile, and a prominent azimuthal asymmetry at a radius of ∼45 mas. Notably, the location of this dust asymmetry coincides with the forward-scattering peak reported in SPHERE/VLT observations of IRAS 08544−4431. The ¹² CO emission is more extended than the dust continuum and confirms the disk rotation in this system. However, the global ¹² CO map shows indications of a spatial offset from the dust asymmetry, suggesting some degree of gas–dust decoupling. Together, these observations establish IRAS 08544−4431 as a key laboratory for studying disk and dust evolution in a parameter space distinct from that of young stars with protoplanetary disks.",
  "abstract_shown": true,
  "affiliations": [
    "Macquarie University",
    "INAF",
    "ATNF",
    "Institute of Astronomy",
    "Monash University",
    "Univ. Grenoble Alpes",
    "Institut de Radioastronomie Millimétrique",
    "Observatorio Astronómico Nacional (OAN-IGN)",
    "Villanova University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 13,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Maksym Mohorian",
      "orcid": "0000-0002-7453-2945"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Devika Kamath",
      "orcid": "0000-0001-8299-3402"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Elizabeth Cappellazzo",
      "orcid": "0009-0004-2905-6515"
    },
    {
      "affs": [
        0
      ],
      "name": "Kateryna Andrych",
      "orcid": "0000-0002-3780-4112"
    },
    {
      "affs": [
        3
      ],
      "name": "Jacques Kluska",
      "orcid": "0000-0002-9491-393X"
    },
    {
      "affs": [
        3
      ],
      "name": "Hans Van Winckel",
      "orcid": "0000-0001-5158-9327"
    },
    {
      "affs": [
        4,
        5
      ],
      "name": "Daniel Price",
      "orcid": "0000-0002-4716-4235"
    },
    {
      "affs": [
        0,
        3
      ],
      "name": "Toon De Prins",
      "orcid": "0000-0001-5760-7557"
    },
    {
      "affs": [
        6
      ],
      "name": "Arancha Castro-Carrizo",
      "orcid": "0000-0001-6872-4206"
    },
    {
      "affs": [
        7
      ],
      "name": "Javier Alcolea",
      "orcid": "0000-0003-1968-0117"
    },
    {
      "affs": [
        5
      ],
      "name": "Nicolás Cuello",
      "orcid": "0000-0003-3713-8073"
    },
    {
      "affs": [
        8
      ],
      "name": "Matthias Fabry",
      "orcid": "0000-0003-4200-7852"
    },
    {
      "affs": [
        7
      ],
      "name": "Valentin Bujarrabal",
      "orcid": "0000-0002-6586-4665"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b7stqbpmfeckg.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aeac1d",
  "fulltext_url": null,
  "id": "b7stqbpmfeckg",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeac1d",
  "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|Stellar, planetary, and galactic studies"
    ]
  ],
  "openalex": "W7214160918",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeac1d/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/b7stqbpmfeckg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aeac1d",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aeac1d"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "ALMA’s Sharpest View of IRAS 08544–4431: Unveiling the Dust Distribution Asymmetries in the Circumbinary Disk",
  "title_text": "ALMA’s Sharpest View of IRAS 08544–4431: Unveiling the Dust Distribution Asymmetries in the Circumbinary Disk",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/b7stqbpmfeckg",
  "venue": "The Astrophysical Journal",
  "versions": []
}