A joint astrometric, eclipse timing and radial velocity orbit for the hierarchical triple V819 Herculis
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 P3 = 2016.97 ± 0.27 d and a high eccentricity of e3 = 0.6800 ± 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 M12 = 2.721 ± 0.055 M⊙ for the inner binary and M3 = 1.954 ± 0.070 M⊙ for the tertiary, together with a LiTE amplitude of ALiTE = 0.0104 d and an RV semi-amplitude of K3 = 18.46 km s−1. The joint fit also yields an orbital parallax of πorb = 14.08 ± 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.
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BibTeX
@misc{akar2026joint,
title = {{A joint astrometric, eclipse timing and radial velocity orbit for the hierarchical triple V819 Herculis}},
author = {Furkan Akar and Özgür Baştürk},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.09551},
eprint = {2611.09551},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.09551},
}
RIS
TY - UNPB
TI - A joint astrometric, eclipse timing and radial velocity orbit for the hierarchical triple V819 Herculis
AU - Furkan Akar
AU - Özgür Baştürk
PY - 2026
DA - 2026/11/06
PB - arXiv
DO - 10.48550/arxiv.2611.09551
UR - https://arxiv.org/abs/2611.09551
AB - 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 ± 0.27 d and a high eccentricity of e_3 = 0.6800 ± 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 ± 0.055 M_⊙ for the inner binary and M_3 = 1.954 ± 0.070 M_⊙ for the tertiary, together with a LiTE amplitude of A_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_orb = 14.08 ± 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.
ER -