A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood

Abstract

We present a self-consistent, absolute isochronal age scale for young (< 200 Myr), nearby (< 100 pc) moving groups in the solar neighbourhood based on homogeneous fitting of semi-empirical pre-main-sequence model isochrones using the tau^2 maximum-likelihood fitting statistic of Naylor & Jeffries in the M_V, V-J colour-magnitude diagram. The final adopted ages for the groups are: 149+51-19 Myr for the AB Dor moving group, 24+/-3 Myr for the β Pic moving group (BPMG), 45+11-7 Myr for the Carina association, 42+6-4 Myr for the Columba association, 11+/-3 Myr for the η Cha cluster, 45+/-4 Myr for the Tucana-Horologium moving group (Tuc-Hor), 10+/-3 Myr for the TW Hya association, and 22+4-3 Myr for the 32 Ori group. At this stage we are uncomfortable assigning a final, unambiguous age to the Argus association as our membership list for the association appears to suffer from a high level of contamination, and therefore it remains unclear whether these stars represent a single population of coeval stars. Our isochronal ages for both the BPMG and Tuc-Hor are consistent with recent lithium depletion boundary (LDB) ages, which unlike isochronal ages, are relatively insensitive to the choice of low-mass evolutionary models. This consistency between the isochronal and LDB ages instills confidence that our self-consistent, absolute age scale for young, nearby moving groups is robust, and hence we suggest that these ages be adopted for future studies of these groups. Software implementing the methods described in this study is available from http: //www.astro.ex.ac.uk/people/timn/tau-squared/.

Accepted for publication in MNRAS, 24 pages, 12 figures and 2 tables

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• A Comparative L-dwarf Sample Exploring the Interplay Between Atmospheric Assumptions and Data Properties
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm
• Physical conditions of gas components in debris disks of 49 Ceti and HD 21997
• Strong H$\alpha$ emission in the young planetary mass companion 2MASS J0249-0557 c
• The milliarcsecond-scale radio structure of AB Dor A
• Detection of H$\alpha$ emission from PZ Tel B using SPHERE/ZIMPOL
• Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the models
• Searching for new young stars in the northern hemisphere: The Pisces Moving Group
• BANYAN. X. Discovery of a wide, low-gravity L-type companion to a fast-rotating M3 dwarf
• Chandra Characterization of X-ray Emission in the Young F-Star Binary System HD 113766
• Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
• Evidence for Centrifugal Breakout around the Young M Dwarf TIC 234284556
• Radial Velocities, Space Motions, and Nearby Young Moving Group Memberships of Eleven Candidate Young Brown Dwarfs
• Mapping the Skies of Ultracool Worlds: Detecting Storms and Spots with Extremely Large Telescopes
• Limits on the presence of planets in systems with debris disks: HD 92945 and HD 107146
• Fine Structure of the Age-Chromospheric Activity Relation in Solar-Type Stars: II. H$\alpha$ Line
• Disks in Nearby Young Stellar Associations Found Via Virtual Reality
• Protoplanetary and Transitional Disks in the Open Stellar Cluster IC 2395
• A kinematically unbiased, all-sky search for nearby, young, low-mass stars
• Spectral characterization of young LT dwarfs
• Imaging of exocomets with infrared interferometry
• CFBDSIR 2149-0403: young isolated planetary-mass object or high-metallicity low-mass brown dwarf??
• Radial velocity survey of spatially resolved young, low-mass binaries
• Characterization of debris disks observed with SPHERE
• Constraints on the presence of SiO gas in the debris disk of HD 172555
• Atmospheric Characterization and Further Orbital Modeling of $\kappa$ And b
• Formation of the warped debris disc around $\beta$ Pictoris
• X-SHYNE: X-Shooter spectra of young exoplanet analogs II. Presentation and analysis of the full library
• A Low-mass, Pre-main-sequence Eclipsing Binary in the 40 Myr Columba Association -- Fundamental Stellar Parameters and Modeling the Effect of Star Spots
• Evidence of a substellar companion to AB Dor C
• COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf
• Confirming the least massive members of the Pleiades star cluster
• The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions
• Dynamical masses of M-dwarf binaries in young moving groups: II - Toward empirical mass-luminosity isochrones
• Detection of a low-mass stellar companion to the accelerating A2IV star HR 1645
• Constraints on Planets in Nearby Young Moving Groups Detectable by High-Contrast Imaging and Gaia Astrometry
• Chandra Observations of Six Peter Pan Disks: Diversity of X-ray-driven Internal Photoevaporation Rates Doesn't Explain Their Rare Longevity
• The family of V1311 Ori: a young sextuple system or a mini-cluster?
• ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
• Disentangling disc and atmospheric signatures of young brown dwarfs with JWST/NIRSpec
• Detecting planetary mass companions near the water frost-line using JWST interferometry
• An L+T Spectral Binary with Possible AB Doradus Kinematics
• A young spectroscopic binary in a quintuple system part of the Local Association
• The curious case of PDS 11: a nearby, >10 Myr old, classical T Tauri binary system
• Orbital Modeling of HII 1348B: An Eccentric Young Substellar Companion in the Pleiades
• High-contrast spectroscopy with the new VLT/ERIS instrument: Molecular maps and radial velocity of the gas giant AF Lep b
• DECam Survey for Low-Mass Stars and Substellar Objects in the UCL and LCC Subgroups of the Sco-Cen OB Association (SCOCENSUS)
• Bayesian ages of local young stellar associations I. Through the expansion rate method
• Distinct Rotational Evolution of Giant Planets and Brown Dwarf Companions
• Companion Mass Limits for 17 Binary Systems Obtained with Binary Differential Imaging and MagAO/Clio
• Identification of young nearby runaway stars based on Gaia data and the lithium test
• An optimised survey strategy for the ERIS/NIX imager: searching for young giant exoplanets and very low mass brown dwarfs using the K-peak custom photometric filter
• Pleiades or Not? Resolving the Status of the Lithium Rich M Dwarfs HHJ339 and HHJ430
• VLT/SPHERE survey for exoplanets around young, early-type stars including systems with multi-belt architectures
• Fundamental stellar parameters for selected T-Tauri stars in the Chamaeleon and Rho Ophiuchus star-forming regions
• Abundant sub-micron grains revealed in newly discovered extreme debris discs
• 2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the $\beta$ Pictoris Moving Group
• Young, active radio stars in the AB Doradus moving group
• Polarized, variable radio emission from the scallop-shell binary system DG CVn
• Flare frequency in M dwarfs belonging to Young Moving Groups
• The Solar Neighborhood L: Spectroscopic Discovery of K Dwarfs Younger Than 1 Gyr and New Binaries within 30 pc
• VLBI detection of nearby (< 100 pc) young stars: Pilot observations
• The Atacama Cosmology Telescope: Systematic Transient Search of Single Observation Maps
• Characterizing bright $\delta$ Scuti pulsators using TESS lightcurves
• UV Spectral Characterization of Low-Mass Stars With AstroSat UVIT for Exoplanet Applications: The Case Study of HIP 23309
• Suppression of lithium depletion in young low-mass stars from fast rotation
• On The Unusual Variability of 2MASS J06195260-2903592: A Long-Lived Disk around a Young Ultracool Dwarf
• Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
• The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-Resolution Spectroscopy
• Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270. Discovery of a post-flare corotating feature
• Orbital characterization of GJ1108A system, and comparison of dynamical mass with model-derived mass for resolved binaries
• The Solar Neighborhood. LV. M Dwarf Twin Binaries -- One in Five Twin Sibling Pairs Are Mismatched in Activity and/or Rotation
• Radial Velocities of Low-mass Candidate TWA Members
• Using Gravity as an Age Indicator for Young Stars
• CD-27 11535: Evidence for a Triple System in the $\beta$ Pictoris Moving Group
• The Directly-Imaged Exoplanet Host Star 51 Eridani is a Gamma Doradus Pulsator
• Coronal and chromospheric emission in A-type stars
• Constraints on the Spindown of Fully-Convective M Dwarfs Using Wide Field Binaries
• Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
• Magnetic geometry of M dwarfs in the southern PLATO field
• The search for gas in debris discs: ALMA detection of CO gas in HD 36546
• Hi-5: a potential high-contrast thermal near-infrared imager for the VLTI