{
  "abstract": "GG Tau $A$ is a young triple system with the close pair, $Ab_1$--$Ab_2$, and $Aa$, surrounded by a massive circumtriple disk with a large inner cavity difficult to explain in a binary framework. We aim to determine the orbital architecture and individual stellar masses of GG Tau $A$ and assess how the available astrometric and disk-based constraints restrict the range of admissible solutions. We performed a joint fit using Oracle, developed specifically for hierarchical stellar systems. All astrometric measurements were placed in a common reference frame, since the historical wide-orbit astrometry is given relative to the unresolved photocenter of the $Ab$ subsystem. The fit included one new wide-orbit astrometric epoch and a prior on the total stellar mass derived from disk kinematics. We then applied, in post-processing, an additional geometrical constraint based on the observed center of the circumtriple disk. The fit yields orbital solutions compatible with the available astrometric and disk-based constraints and provides estimates of the individual stellar masses. The additional wide-orbit epoch only marginally reduces the range of admissible solutions. By contrast, the disk-center constraint leaves the favored orbital architectures largely unchanged but significantly tightens the stellar-mass partition. This yields posterior masses of $0.521^{+0.069}_{-0.051}$, $0.106^{+0.017}_{-0.013}$, and $0.79^{+0.10}_{-0.10}$ $M_\\odot$ for $Ab_1$, $Ab_2$, and $Aa$, respectively. The reported values are posterior medians with 16th--84th percentile intervals. A joint treatment of the two orbital levels is required to recover a physically meaningful architecture and constrain the individual stellar masses. The resulting solutions provide a basis for future dynamical modeling of the circumtriple disk and for testing whether the observed cavity can further constrain the system architecture.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.17322",
  "author_total": 7,
  "authors": [
    {
      "name": "A. Lacquement"
    },
    {
      "name": "H. Beust"
    },
    {
      "name": "G. Duchêne"
    },
    {
      "name": "C. Lawlor"
    },
    {
      "name": "C. Ginski"
    },
    {
      "name": "E. Di Folco"
    },
    {
      "name": "A. Dutrey"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4djnvs2ky3cw7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.17322",
  "fulltext_url": null,
  "id": "4djnvs2ky3cw7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.17322",
  "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.GA"
    ],
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.17322",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4djnvs2ky3cw7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "2609.17322",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.17322"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.EP",
      "subfield": "planetary"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "A self-consistent orbital architecture for GG Tau A. I. Simultaneous orbital fitting of the hierarchical triple",
  "title_text": "A self-consistent orbital architecture for GG Tau A. I. Simultaneous orbital fitting of the hierarchical triple",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:01Z",
  "url": "https://research.draconitic.com/paper/4djnvs2ky3cw7",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202662146",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}