{
  "abstract": "We present a joint Bayesian orbital analysis of the hierarchical triple system V819 Herculis using ground-based astrometry, radial velocities (RV), and eclipse timing variations (ETV). By coupling these complementary data sets within a physically consistent Keplerian framework, we obtain a self-consistent three-dimensional solution for the outer orbit and the dynamical properties of the system. The outer orbit is found to have a period of $P_3 = 2016.97 \\pm 0.27$ d and a high eccentricity of $e_3 = 0.6800 \\pm 0.0016$, with the same orbital geometry simultaneously reproducing the sky-plane astrometry, the LiTE signal in the eclipse timings, and the tertiary radial velocities. The joint solution determines the component masses dynamically from these data alone, yielding $M_{12} = 2.721 \\pm 0.055\\,M_\\odot$ for the inner binary and $M_3 = 1.954 \\pm 0.070\\,M_\\odot$ for the tertiary, together with a LiTE amplitude of $A_\\mathrm{LiTE} = 0.0104$ d and an RV semi-amplitude of $K_3 = 18.46$ km s$^{-1}$. The joint fit also yields an orbital parallax of $π_\\mathrm{orb} = 14.08 \\pm 0.13$ mas, consistent with Gaia DR3, Gaia DR2 and the HIPPARCOS New Reduction. The derived tertiary mass is higher than expected for a standard G8-type main-sequence star, suggesting that the tertiary component may be in an advanced evolutionary stage. The resulting outer orbit is well constrained, and the system is strongly hierarchical, with an outer period about 900 times the inner one. Finally, we provide predicted astrometric positions for the tertiary component for five years beyond 2026.5 to guide future high-precision observations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.09551",
  "author_total": 2,
  "authors": [
    {
      "name": "Furkan Akar"
    },
    {
      "name": "Özgür Baştürk"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ekrejm5myc2az.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.09551",
  "fulltext_url": null,
  "id": "ekrejm5myc2az",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.09551",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.SR"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.09551",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ekrejm5myc2az.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:04Z",
      "native_id": "2611.09551",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.09551"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.SR",
      "subfield": "stellar"
    }
  ],
  "title": "A joint astrometric, eclipse timing and radial velocity orbit for the hierarchical triple V819 Herculis",
  "title_text": "A joint astrometric, eclipse timing and radial velocity orbit for the hierarchical triple V819 Herculis",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:04Z",
  "url": "https://research.draconitic.com/paper/ekrejm5myc2az",
  "venue": "arXiv",
  "versions": []
}