BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc

Abstract

BANYAN $\Sigma$ is a new Bayesian algorithm to identify members of young stellar associations within 150 pc of the Sun. It includes 27 young associations with ages in the range ~1-800 Myr, modelled with multivariate Gaussians in 6-dimensional XYZUVW space. It is the first such multi-association classification tool to include the nearest sub-groups of the Sco-Cen OB star-forming region, the IC 2602, IC 2391, Pleiades and Platais 8 clusters, and the $\rho$ Ophiuchi, Corona Australis, and Taurus star-formation regions. A model of field stars is built from a mixture of multivariate Gaussians based on the Besançon Galactic model. The algorithm can derive membership probabilities for objects with only sky coordinates and proper motion, but can also include parallax and radial velocity measurements, as well as spectrophotometric distance constraints from sequences in color-magnitude or spectral type-magnitude diagrams. BANYAN $\Sigma$ benefits from an analytical solution to the Bayesian marginalization integrals that makes it more accurate and significantly faster than its predecessor BANYAN II. A contamination versus hit rate analysis is presented and demonstrates that BANYAN $\Sigma$ achieves a better classification performance than other moving group classification tools, especially in terms of cross-contamination between young associations. An updated list of bona fide members in the 27 young associations, augmented by the Gaia-DR1 release, are presented. This new tool will make it possible to analyze large data sets such as the upcoming Gaia-DR2 to identify new young stars. IDL and Python versions of BANYAN $\Sigma$ are made available with this publication. (shortened)

arXiv comment52 pages, 12 figures, 11 tables. Accepted for publication in the Astrophysical Journal Supplement Series. Minor corrections and updated URLs

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• The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098
• K2 Ultracool Dwarfs Survey. V. High superflare rates on rapidly rotating late-M dwarfs
• Emission line variability of young 10-30 Mjup companions : I. The case of GQ Lup b and GSC 06214-00210 b
• Cloud Atlas: High-Contrast Time-Resolved Observations of Planetary-Mass Companions
• Validation of 13 Hot and Potentially Terrestrial TESS Planets
• The Giant Accreting Protoplanet Survey (GAPlanetS) -- Results from a Six Year Campaign to Image Accreting Protoplanets
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph -- III. Dust Grains in Young L Dwarf Atmospheres Are Heavier
• A new sample of warm extreme debris disks from the ALLWISE catalog
• New Coronae and Stellar Associations Revealed by a Clustering Analysis of the Solar Neighborhood
• Irregular dust features around intermediate-mass young stars with GPI: signs of youth or misaligned disks?
• WISE2150-7520AB: A very low mass, wide co-moving brown dwarf system discovered through the citizen science project Backyard Worlds: Planet 9
• FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 1623$-$2417
• Addressing Systematics in the Traceback Age of the $\beta$ Pictoris Moving Group
• ALMA detections of the youngest protostars in Ophiuchus
• Intrinsic Lyman alpha Profiles of High-Velocity G, K, and M Dwarfs
• SPYGLASS. III. The Fornax-Horologium Association and its Traceback History within the Austral Complex
• BEAST begins: Sample characteristics and survey performance of the B-star Exoplanet Abundance Study
• A new take on the low-mass brown dwarf companions on wide-orbits in Upper-Scorpius
• A Census of Stars and Disks in Corona Australis
• Deep Long Asymmetric Occultation in EPIC 204376071
• Activity of TRAPPIST-1 analogue stars observed with TESS
• 2MASS J15460752-6258042: a mid-M dwarf hosting a prolonged accretion disc
• Evidence Suggesting that 'Oumuamua is the ~30 Myr-old product of a Molecular Cloud
• TOI-1231 b: A Temperate, Neptune-Sized Planet Transiting the Nearby M3 Dwarf NLTT 24399
• TOI-3235 b: a transiting giant planet around an M4 dwarf star
• Scaling K2. IV. A Uniform Planet Sample for Campaigns 1-8 and 10-18
• The Age of the Carina Young Association and Potential Membership of HD 95086
• Speckle Interferometry at SOAR in 2020
• Lithium in the Hyades L5 brown dwarf 2MASSJ04183483+2131275
• A Dynamical Model for Clustered Star Formation in the Galactic Disk
• Three small planets transiting the bright young field star K2-233
• A Mini-Neptune from TESS and CHEOPS Around the 120 Myr Old AB Dor member HIP 94235
• Chemo-kinematic ages of eccentric-planet-hosting M dwarf stars
• Gemini Planet Imager Spectroscopy of the Dusty Substellar Companion HD 206893 B
• TOI-3984 A b and TOI-5293 A b: two temperate gas giants transiting mid-M dwarfs in wide binary systems
• TOI 540 b: A Planet Smaller than Earth Orbiting a Nearby Rapidly Rotating Low-mass Star
• FAUST VIII. The protostellar disk of VLA 1623-2417 W and its streamers imaged by ALMA
• The CARMENES search for exoplanets around M dwarfs. Two terrestrial planets orbiting G 264-012 and one terrestrial planet orbiting Gl 393
• TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
• Zodiacal Exoplanets in Time (ZEIT) XIII: Planet Orbits and Atmospheres in the V1298 Tau System, a Keystone in Studies of Early Planetary Evolution
• Dynamical Mass of the Exoplanet Host Star HR 8799
• VIRAC2: NIR Astrometry and Time Series Photometry for 500M+ Stars from the VVV and VVVX Surveys
• TOI-1728b: The Habitable-zone Planet Finder confirms a warm super Neptune orbiting an M dwarf host
• Follow-up Imaging of Disk Candidates from the Disk Detective Citizen Science Project: New Discoveries and False-Positives in WISE Circumstellar Disk Surveys
• Chronostar. II. Kinematic age and substructure of the Scorpius-Centaurus OB2 association
• SCExAO/MEC and CHARIS Discovery of a Low Mass, 6 AU-Separation Companion to HIP 109427 using Stochastic Speckle Discrimination and High-Contrast Spectroscopy
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• Gaia-based Isochronal, Kinematic, and Spatial Analysis of the $\epsilon$ Cha Association
• The Little Dippers: Transits of Star-grazing Exocomets?
• NEID Rossiter-McLaughlin Measurement of TOI-1268b: A Young Warm Saturn Aligned with Its Cool Host Star
• Most nearby young star clusters formed in three massive complexes
• The ASAS-SN Catalog of Variable Stars VIII: "Dipper" Stars in the Lupus Star-Forming Region
• JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO${}_2$ in the HR 8799 and 51 Eri Exoplanets' Atmospheres
• The Planet Formation Potential Around a 45 Myr old Accreting M Dwarf
• Dynamical age of the Tucana-Horologium young stellar association
• A 38 Million Year Old Neptune-Sized Planet in the Kepler Field
• Two super-Earths at the edge of the habitable zone of the nearby M dwarf TOI-2095
• TOI-2119: A transiting brown dwarf orbiting an active M-dwarf from NASA's TESS mission
• Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
• A Wide Planetary Mass Companion Discovered Through the Citizen Science Project Backyard Worlds: Planet 9
• The Oceanus Moving Group: A New 500 Myr-Old Host for the Nearest Brown Dwarf
• Radial Velocity Survey for Planets around Young stars (RVSPY) A transiting warm super-Jovian planet around HD 114082, a young star with a debris disk
• Extending the FIP bias sample to magnetically active stars. Challenging the FIP bias paradigm?
• Planetesimals Around Stars with TESS (PAST): I. Transient Dimming of a Binary Solar Analog at the End of the Planet Accretion Era
• Stellar Flyby Analysis for Spiral Arm Hosts with Gaia DR3
• Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
• Pterodactyls: A Tool to Uniformly Search and Vet for Young Transiting Planets In TESS Primary Mission Photometry
• TOI-1268b: the youngest, hot, Saturn-mass transiting exoplanet
• The "Giraffe": Discovery of a stripped red giant in an interacting binary with a $\sim 2M_{\odot }$ lower giant
• Cloud Atlas: High-precision HST/WFC3/IR Time-Resolved Observations of Directly-Imaged Exoplanet HD106906b
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• MADYS: the Manifold Age Determination for Young Stars
• Ultracool dwarfs in Gaia DR3
• The old moving groups in the field of Taurus
• WEIRD: Wide-orbit Exoplanet search with InfraRed Direct imaging
• A Census of the 32 Ori Association with Gaia
• TOI-1696: a nearby M4 dwarf with a $3R_{\oplus }$ planet in the Neptunian desert
• The Epoch of Giant Planet Migration Planet Search Program. I. Near-Infrared Radial Velocity Jitter of Young Sun-like Stars
• Rotation and Abundances of the Benchmark Brown Dwarf HD 33632 Ab from Keck/KPIC High-resolution Spectroscopy
• Canis Major OB1 stellar groups contents revealed by Gaia
• A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654
• TOI-179: a young system with a transiting compact Neptune-mass planet and a low-mass companion in outer orbit
• TOI-1075 b: A Dense, Massive, Ultra-Short Period Hot Super-Earth Straddling the Radius Gap
• RVSPY -- Radial Velocity Survey for Planets around Young Stars. Target characterization and high-cadence survey
• New low-mass members of Chamaeleon I and $\epsilon$ Cha
• Variability Timescales of H$\alpha$ on Active Mid-to-Late M dwarfs
• Distances to nearby molecular clouds traced by young stars
• A massive hot Jupiter orbiting a metal-rich early-M star discovered in the TESS full frame images
• JWST Observations of the Enigmatic Y Dwarf WISE 1828+2650: I. Limits to a Binary Companion
• Discovery of a White Dwarf Companion to HD 159062
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• Two cold belts in the debris disk around the G-type star NZ Lup
• Active Stars in the Spectroscopic Survey of Mid-to-Late M Dwarfs Within 15pc
• TOI-4562 b: A highly eccentric temperate Jupiter analog orbiting a young field star
• A kinematically hot population of young stars in the solar neighbourhood
• Planetesimals Around Stars with TESS (PAST): II. An M Dwarf "Dipper" Star with a Long-Lived Disk in the TESS Continuous Viewing Zone
• New ultracool dwarf neighbours within 20pc from Gaia DR2
• Two Massive Jupiters in Eccentric Orbits from the TESS Full Frame Images
• Birth Sites of Young Stellar Associations and Recent Star Formation in a Flocculent Corrugated Disk
• Discovery of an Edge-on Circumstellar Debris Disk Around BD+45${}^{\circ }$598: a Newly Identifed Member of the $\beta$ Pictoris Moving Group
• The GALAH Survey: Lithium-strong KM dwarfs
• Multiplicity of stars with planets in the solar neighbourhood
• FAUST VI. VLA 1623--2417 B: a new laboratory for astrochemistry around protostars on 50 au scale
• Search for planets around stars with wide brown dwarfs
• Constraining the period of the ringed secondary companion to the young star J1407 with photographic plates
• Using autoencoders and deep transfer learning to determine the stellar parameters of 286 CARMENES M dwarfs
• A Late-type L Dwarf at 11 pc Hiding in the Galactic Plane Characterized Using Gaia DR2
• High Contrast Thermal Infrared Spectroscopy with ALES: The 3-4$\mu$m Spectrum of $\kappa$ Andromedae b
• The $\text{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\text{Gaia}$ DR2 ultra-cool dwarf
• A collage of small planets from the Lick Carnegie Exoplanet Survey : Exploring the super-Earth and sub-Neptune mass regime
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Multiples among B stars in the Scorpius-Centaurus association
• A multi-planetary system orbiting the early-M dwarf TOI-1238
• Non-thermal radio continuum emission from young nearby stars
• TOI-5344 b: A Saturn-like planet orbiting a super-Solar metallicity M0 dwarf
• Discovery of 16 New Members of the Solar Neighborhood using Proper Motions from CatWISE2020
• The compositions of the HR 8799 planets reflect accretion of both solids and metal-enriched gas
• Resolving the outer ring of HD 38206 using ALMA and constraining limits on planets in the system
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• Discovery of δ Scuti Pulsations in the Young Hybrid Debris Disk Star HD 156623
• Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
• Discovery of new members of the nearby young stellar association in Cepheus
• PDS 70 unveiled by star-hopping: total intensity, polarimetry and mm-imaging modeled in concert
• Radio Emission from Binary Ultracool Dwarf Systems
• YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) -- I. A search for young exoplanets in Sectors 1-5 of the TESS Full-Frame-Images
• A spectroscopically confirmed Gaia-selected sample of 318 new young stars within $\sim$200 pc
• Discovery of two nearby post-T Tauri stellar associations
• Individual Dynamical Masses of DENIS J063001.4$-$184014AB Reveal A Likely Young Brown Dwarf Triple
• Examining the Rotation Period Distribution of the 40 Myr Tucana-Horologium Association with TESS
• Constraining masses and separations of unseen companions to five accelerating nearby stars
• Exoplanet accretion monitoring spectroscopic survey (ENTROPY) I. Evidence for magnetospheric accretion in the young isolated planetary-mass object 2MASS J11151597+1937266
• First resolved observations of a highly asymmetric debris disc around HD 160305 with VLT/SPHERE
• Astrometric star-cluster membership probability: application to the case of M 37 with Gaia EDR3
• Visual Orbits of Spectroscopic Binaries with the CHARA Array. II. The eclipsing binary HD 185912
• A hot Mars-sized exoplanet transiting an M dwarf
• Discovery of the Exceptionally Short Period Ultracool Dwarf Binary LP 413-53AB
• Dynamical masses of two young transiting sub-Neptunes orbiting HD 63433
• VIBES: VIsual Binary Exoplanet survey with SPHERE Upper limits on wide S-planet and S-BD frequencies, triple system discovery, and astrometric confirmation of 20 stellar binaries and three triple systems
• Direct Imaging Discovery of a Young Brown Dwarf Companion to an A2V Star
• SCExAO and Keck Direct Imaging Discovery of a Low-Mass Companion Around the Accelerating F5 Star HIP 5319
• Multiband imaging of the HD 36546 debris disk: a refined view from SCExAO/CHARIS
• The photometric periods of rapidly rotating field ultra-cool dwarfs
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm
• Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546
• Ultracool dwarfs candidates based on six years of the Dark Energy Survey data
• X-Shooter Survey of Young Intermediate Mass Stars -- I. Stellar Characterization and Disc Evolution
• The GAPS programme at TNG XXXIV. Activity-rotation, flux-flux relationships, and active region evolution through stellar age
• Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
• TOI-712: a system of adolescent mini-Neptunes extending to the habitable zone
• Reaching the boundary between stellar kinematic groups and very wide binaries. IV. The widest Washington double star systems with rho > 1000 arcsec in Gaia DR3
• Evidence for Centrifugal Breakout around the Young M Dwarf TIC 234284556
• A Search for Exoplanets in Open Clusters and Young Associations based on TESS Objects of Interest
• Disks in Nearby Young Stellar Associations Found Via Virtual Reality
• Radial Velocities, Space Motions, and Nearby Young Moving Group Memberships of Eleven Candidate Young Brown Dwarfs
• Limits on the presence of planets in systems with debris disks: HD 92945 and HD 107146
• A High-Resolution Spectroscopic Survey of Directly Imaged Companion Hosts: I. Determination of diagnostic stellar abundances for planet formation and composition
• Characterization of debris disks observed with SPHERE
• The ESO SupJup Survey VIII. Chemical fingerprints of young L dwarf twins
• A kinematically unbiased, all-sky search for nearby, young, low-mass stars
• Monitoring of the D Doublet of Neutral Sodium during Transits of Two "Evaporating" Planets
• Radial velocity survey of spatially resolved young, low-mass binaries
• Giant planets population around B stars from the first part of the BEAST survey
• Spectral characterization of newly detected young substellar binaries with SINFONI
• Spectral characterization of young LT dwarfs
• Narrow belt of debris around the Sco-Cen star HD 141011
• Unbound stars hold the key to young star cluster history
• HORuS transmission spectroscopy and revised planetary parameters of KELT-7b
• An unusually large gaseous transit in a debris disc
• TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
• 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
• Sporadic and intense accretion in a 1 Myr-old brown dwarf candidate
• TOI-5375 B: A Very Low Mass Star at the Hydrogen-Burning Limit Orbiting an Early M-type Star
• Primeval very low-mass stars and brown dwarfs -- VIII. The first age benchmark L subdwarf, a wide companion to a halo white dwarf
• Atmospheric Characterization and Further Orbital Modeling of $\kappa$ And b
• COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf
• A study of the frequency and characteristics of stellar companions and Jupiter-like planets in nearby open clusters
• Chandra Observations of Six Peter Pan Disks: Diversity of X-ray-driven Internal Photoevaporation Rates Doesn't Explain Their Rare Longevity
• Visual Orbits of Spectroscopic Binaries with the CHARA Array. IV. HD 61859, HD 89822, HD 109510, and HD 191692
• The family of V1311 Ori: a young sextuple system or a mini-cluster?
• FORECASTOR -- I. Finding Optics Requirements and Exposure times for the Cosmological Advanced Survey Telescope for Optical and UV Research mission
• Detection of a low-mass stellar companion to the accelerating A2IV star HR 1645
• Fine structure in the luminosity function in young stellar populations with Gaia DR2
• J-PLUS: Discovery and characterisation of ultracool dwarfs using Virtual Observatory tools II. Second data release and machine learning methodology
• Dynamical masses of M-dwarf binaries in young moving groups: II - Toward empirical mass-luminosity isochrones
• The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions
• Constraints on Planets in Nearby Young Moving Groups Detectable by High-Contrast Imaging and Gaia Astrometry
• The apparent absence of forward scattering in the HD 53143 debris disk
• Confirming the Tidal Tails of the Young Open Cluster Blanco 1 with TESS Rotation Periods
• Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2
• The Ages of Optically Bright Sub-Clusters in the Serpens Star-Forming Region
• High-contrast, high-angular resolution view of the GJ 367 exoplanet system
• A young spectroscopic binary in a quintuple system part of the Local Association
• The GAPS programme at TNG XLIII. A massive brown dwarf orbiting the active M dwarf TOI-5375
• Discovery and characterization of a dense sub-Saturn TOI-6651b
• Detecting planetary mass companions near the water frost-line using JWST interferometry
• Broadband vortex fiber nulling: high-dispersion exoplanet science at the diffraction limit
• Bayesian ages of local young stellar associations I. Through the expansion rate method
• High-contrast detection of exoplanets with a kernel-nuller at the VLTI
• From moving groups to star formation in the Solar Neighborhood
• GPI+SPHERE detection of a 6.1 $M_{\text{Jup}}$ circumbinary planet around HD 143811
• Distinct Rotational Evolution of Giant Planets and Brown Dwarf Companions
• Direct Imaging Explorations for Companions around Mid-Late M Stars from the Subaru/IRD Strategic Program
• Companion Mass Limits for 17 Binary Systems Obtained with Binary Differential Imaging and MagAO/Clio
• Spectroscopic observations of the machine-learning selected anomaly catalogue from the AllWISE Sky Survey
• YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) II: Using Self-Organising Maps to explore young star variability in Sectors 1-13 of TESS data
• Characterization of very wide companion candidates to young stars with planets and disks
• 2MASS J10274572+0629104: The very short period young M6 Dwarf Binary System identified in K2 data
• The first scattered light images of HD 112810, a faint debris disk in the Sco-Cen association
• The Solar Neighborhood L: Spectroscopic Discovery of K Dwarfs Younger Than 1 Gyr and New Binaries within 30 pc
• Near-infrared spectroscopic characterisation of Gaia ultra-cool dwarf candidates; Spectral types and peculiarities
• HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen
• A sub-Neptune transiting the young field star HD 18599 at 40 pc
• 2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the $\beta$ Pictoris Moving Group
• SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515
• Walking the Line: Young Stars on the Boundary of the Epsilon Cha and Lower Centaurus-Crux Associations
• Abundant sub-micron grains revealed in newly discovered extreme debris discs
• The Solar Neighborhood LII: M Dwarf Twin Binaries -- Presumed Identical Twins Appear Fraternal in Variability, Rotation, H$\alpha$, and X-rays
• Three new late-type stellar companions to very dusty WISE debris disks identified with VLT/SPHERE imaging
• A search for stellar siblings of the ~ 200 Myr TOI-251b planetary system
• SDSS J100711.74+193056.2: A Candidate Common Motion Substellar Companion to the Nearest B-Type Star Regulus
• Discovery of carbon monoxide emission from five debris disks around young A-type stars
• PLATOSpec: a precise spectrograph in support of space missions
• Exoplanet detection and its dependence on stochastic sampling of the stellar Initial Mass Function
• Toward the fabric of the Milky Way I. The density of disk streams from a local $250^3$ pc${}^3$ volume
• Two Bright M Dwarfs Hosting Ultra-Short-Period Super-Earths with Earth-like Compositions
• OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration
• New members of the Lupus I cloud based on Gaia astrometry Physical and accretion properties from X-Shooter spectra
• Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems
• The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-Resolution Spectroscopy
• A new moving group in the Local Arm
• The Solar Neighborhood. LV. M Dwarf Twin Binaries -- One in Five Twin Sibling Pairs Are Mismatched in Activity and/or Rotation
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs
• Nearby Young Stars and Young Moving Groups
• Moving Groups in the Solar Neighborhood with Gaia, APOGEE, GALAH, and LAMOST: Dynamical Effects Gather Gas and the Ensuing Star Formation Plays an Important Role in Shaping the Stellar Velocity Distributions
• Spectroscopic Characterization of WD J000801.25-350450 and its Two Co-Moving Companions
• TOI-4552 b: A new ultra-short period rocky world revealed by NIRPS and TESS
• Direct Imaging Discovery of Giant Exoplanet $\beta$ Pictoris d: A Decade-Long Game of Hide-and-Seek
• Apache Point Observatory follow-up of ACcelerating Candidate ExopLanet host Stars (APO ACCELS): Ages for 166 Accelerating Stars in the Northern Hemisphere
• Radial Velocities of Low-mass Candidate TWA Members
• Orbital characterization of GJ1108A system, and comparison of dynamical mass with model-derived mass for resolved binaries
• On The Unusual Variability of 2MASS J06195260-2903592: A Long-Lived Disk around a Young Ultracool Dwarf
• HD 44892: The youngest (or oldest?) gas-harbouring debris disc around an intermediate mass star
• Going Bayesian on the ages of nearby young stellar systems I. The expansion rate method
• Keck Observations in the INfrared of Taurus and $\rho$ Oph Exoplanets And Ultracool dwarfs (KOINTREAU) II: Two Young Bound Companions to Ophiuchus Stars
• The GAPS Programme at the TNG: LXX. TOI-5734b: A hot sub-Neptune orbiting a relatively young K dwarf with an Earth-like density
• The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk
• TOI-6884b: A low-mass brown dwarf transiting a slightly evolved star
• HD 26172: an active solar-type subgiant in a close binary system
• Disentangling the Signatures of Blended-Light Atmospheres in L/T Transition Brown Dwarfs
• Transit Hunt for Young and Maturing Exoplanets (THYME) VIII: a Pleiades-age association harboring two transiting planetary systems from Kepler
• A simple linear model to aid in analyses of the Beta Pictoris moving group
• TOI-3757 b: A low density gas giant orbiting a solar-metallicity M dwarf
• Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
• Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project
• HIP 67506 C: MagAO-X Confirmation of a New Low-Mass Stellar Companion to HIP 67506 A
• Constraints on the Spindown of Fully-Convective M Dwarfs Using Wide Field Binaries
• The Perkins INfrared Exosatellite Survey (PINES) I. Survey Overview, Reduction Pipeline, and Early Results
• Substellar Hyades Candidates from the UKIRT Hemisphere Survey
• Activity-rotation in the dM4 star Gl 729. A possible chromospheric cycle