Dynamical age of the Tucana-Horologium young stellar association

Abstract

The Tucana-Horologium association is one of the closest young stellar groups to the Sun and despite the close proximity its age is still debated in the literature. We take advantage of the state-of-the-art astrometry delivered by the third data release of the Gaia space mission combined with precise radial velocity measurements obtained from high-resolution spectroscopy to investigate the dynamical age of the association. We perform an extensive traceback analysis using a combination of different samples of cluster members, metrics to evaluate the minimum size of the association in the past and models for the galactic potential to integrate the stellar orbits back in time. The dynamical age of $38.5_{-8.0}^{+1.6}$ Myr that we derive in this paper is consistent with the various age estimates obtained from isochrone fitting in the literature (30-50 Myr) and reconciles, for the first time, the dynamical age of the Tucana-Horologium association with the age obtained from lithium depletion ($\sim 40$ Myr). Our results are independent from stellar models and represent one more step towards constructing a self-consistent age scale for the young stellar groups of the Solar neighbourhood based on the 3D space motion of the stars.

arXiv comment13 pages, 6 figures, accepted for publication in MNRAS

References in corpus (33)

• The Gaia mission
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Local Kinematics and the Local Standard of Rest
• galpy: A Python Library for Galactic Dynamics
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• The mass distribution and gravitational potential of the Milky Way
• A giant planet imaged in the disk of the young star Beta Pictoris
• A Giant Planet Candidate near a Young Brown Dwarf
• The Ages of Stars
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
• Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades
• The Geneva-Copenhagen Survey of the Solar neighbourhood II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk
• Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
• Modern stellar spectroscopy caveats
• A lithium depletion boundary age of 21 Myr for the Beta Pictoris moving group
• HST/ACS Multiband Coronagraphic Imaging of the Debris Disk around Beta Pictoris
• A Stellar Census of the Tucana-Horologium Moving Group
• Cross-Correlation and Maximum Likelihood Analysis: A New Approach to Combine Cross-Correlation Functions
• TESS Hunt for Young and Maturing Exoplanets (THYME): A planet in the 45 Myr Tucana-Horologium association
• Identification of a nearby stellar association in the Hipparcos catalog: implications for recent, local star formation
• Lithium Depletion of Nearby Young Stellar Associations
• A New Association of Post-T Tauri Stars Near The Sun
• BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2
• Dynamical traceback age of the $\beta$ Pictoris moving group
• The TW Hydrae Association : trigonometric parallaxes and kinematic analysis
• The Lithium Depletion Boundary and the Age of the Young Open Cluster IC~2391
• BANYAN. XII. New Members of Nearby Young Associations from Gaia-Tycho Data
• Dynamical Evolution of the TW Hya Association
• Lithium depletion boundary, stellar associations, and Gaia
• SPYGLASS. III. The Fornax-Horologium Association and its Traceback History within the Austral Complex
• VLT/NACO coronagraphic observations of fine structures in the disk of beta Pictoris

Cited by in corpus (6)

• A Census of the TW Hya Association with Gaia
• ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY) - II. Time series of Balmer line profiles of Delorme 1(AB)b
• Bayesian ages of local young stellar associations I. Through the expansion rate method
• Fundamental limits to orbit reconstruction due to non-conservation of stellar actions in a Milky Way-like simulation
• The internal kinematics of local young stellar associations. Identifying correlations among age, expansion, rotation, and shear
• Going Bayesian on the ages of nearby young stellar systems I. The expansion rate method