{
  "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 ($10^4-10^5$ years) 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 1 000 au. We probe the disk layers close to the midplane using 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 yet achieved with ALMA for dust-continuum observations of post-AGB binaries with a (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 $\\sim$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": [],
  "article_type": null,
  "arxiv": "2609.27997",
  "author_total": 13,
  "authors": [
    {
      "name": "Maksym Mohorian"
    },
    {
      "name": "Devika Kamath"
    },
    {
      "name": "Elizabeth Cappellazzo"
    },
    {
      "name": "Kateryna Andrych"
    },
    {
      "name": "Jacques Kluska"
    },
    {
      "name": "Hans van Winckel"
    },
    {
      "name": "Daniel Price"
    },
    {
      "name": "Toon De Prins"
    },
    {
      "name": "Arancha Castro-Carrizo"
    },
    {
      "name": "Javier Alcolea"
    },
    {
      "name": "Nicolas Cuello"
    },
    {
      "name": "Matthias Fabry"
    },
    {
      "name": "Valentin Bujarrabal"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8k0pmpfgqq5vw.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.27997",
  "fulltext_url": null,
  "id": "8k0pmpfgqq5vw",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.27997",
  "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.EP"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.27997",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/8k0pmpfgqq5vw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:56Z",
      "native_id": "2609.27997",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.27997"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "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": "preprint",
  "updated_at": "2026-10-30T12:23:56Z",
  "url": "https://research.draconitic.com/paper/8k0pmpfgqq5vw",
  "venue": "arXiv",
  "versions": []
}