The Nearby, Young, Chi1 Fornacis Cluster: Membership, Age, and an Extraordinary Ensemble of Dusty Debris Disks

Abstract

Only four star clusters are known within ~100 pc of Earth. Of these, the Chi1 For cluster has barely been studied. We use the Gaia DR2 catalog and other published data to establish the cluster membership, structure, and age. The age of and distance to the cluster are ~40 Myr and 104 pc, respectively. A remarkable, unprecedented, aspect of the cluster is the large percentage of M-type stars with warm excess infrared emission due to orbiting dust grains -- these stars lie in an annulus that straddles the tidal radius of the cluster. The Chi1 For cluster appears to be closely related to two extensive, previously known, groups of co-moving, coeval stars (the Tucana-Horologium and Columba Associations) that are spread over much of the southern sky. While Tuc-Hor and Chi1 For are comoving and coeval, the difference in the frequency of their warm dusty debris disks at M-type stars could hardly be more dramatic.

arXiv commentThis October 2019 version of the paper replaces the initial (September 2019) version. The most important changes are a slight renumbering (renaming) of most of the ChiFor stars in Tables 1 and 2 and the addition of a Note Added in Proof

References in corpus (23)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Gaia Data Release 2: The astrometric solution
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• New catalogue of optically visible open clusters and candidates
• The Eccentric Kozai-Lidov Effect and Its Applications
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Revised Catalog of GALEX Ultraviolet Sources. I. The All-sky Survey: GUVcat_AIS
• A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS
• A Stellar Census of the Tucana-Horologium Moving Group
• A 5D view of the Alpha Per, Pleiades, and Praesepe clusters
• The Age of the HD 15407 System and the Epoch of Final Catastrophic Mass Accretion onto Terrestrial Planets around Sun-like Stars
• Volans-Carina: A New 90 Myr Old Stellar Association at 85 pc
• A statistical method to determine open cluster metallicities
• Reanalysis of nearby open clusters using Gaia DR1/TGAS and HSOY
• A WISE-based search for debris discs amongst M-dwarfs in nearby, young, moving groups
• Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False-Positives in WISE Circumstellar Disk Surveys
• The Planet Formation Potential Around a 45 Myr old Accreting M Dwarf
• Warm Dusty Debris Disks and Distant Companion Stars: V488 Per and 2M1337
• Jet Kinematics of the Quasar 4C +21.35 from Observations with the KaVA Very Long Baseline Interferometry Array
• Nearby Young, Active, Late-type Dwarfs in Gaia's First Data Release

Cited by in corpus (11)

• Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars
• A new sample of warm extreme debris disks from the ALLWISE catalog
• SPYGLASS. III. The Fornax-Horologium Association and its Traceback History within the Austral Complex
• Observability of Debris Discs around M-stars
• Gaia-based Isochronal, Kinematic, and Spatial Analysis of the $\epsilon$ Cha Association
• A Census of the 32 Ori Association with Gaia
• The origin of early-type runaway stars from open clusters
• Disks in Nearby Young Stellar Associations Found Via Virtual Reality
• Walking the Line: Young Stars on the Boundary of the Epsilon Cha and Lower Centaurus-Crux Associations
• Characterizing bright $\delta$ Scuti pulsators using TESS lightcurves
• Nearby Young Stars and Young Moving Groups