A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs

Abstract

We present a near-infrared (0.9-2.4 microns) spectroscopic study of 73 field ultracool dwarfs having spectroscopic and/or kinematic evidence of youth (~10-300 Myr). Our sample is composed of 48 low-resolution (R~100) spectra and 41 moderate-resolution spectra (R>~750-2000). First, we establish a method for spectral typing M5-L7 dwarfs at near-IR wavelengths that is independent of gravity. We find that both visual and index-based classification in the near-IR provide consistent spectral types with optical spectral types, though with a small systematic offset in the case of visual classification at J and K band. Second, we examine features in the spectra of ~10 Myr ultracool dwarfs to define a set of gravity-sensitive indices based on FeH, VO, K, Na and H-band continuum shape. We then create an index-based method for classifying the gravities of M6-L5 dwarfs that provides consistent results with gravity classifications from optical spectroscopy. Our index-based classification can distinguish between young and dusty objects. Guided by the resulting classifications, we propose a set of low-gravity spectral standards for the near-IR. Finally, we estimate the ages corresponding to our gravity classifications.

Published in ApJ. IDL program for calculating indices (allers13_index.pro) included in the source gzipped tar

References in corpus (18)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Constraining the Age-Activity Relation for Cool Stars: The SDSS DR5 Low-Mass Star Spectroscopic Sample
• The 0.8-14.5 micron Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• Planets around evolved intermediate-mass stars. I. Two substellar companions in the open clusters NGC 2423 and NGC 4349
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Characterizing Young Brown Dwarfs using Low Resolution Near-IR Spectra
• Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
• Subtle Signatures of Multiplicity in Late-type Dwarf Spectra: The Unresolved M8.5 + T5 Binary 2MASS J03202839-0446358
• Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich?
• Lithium Depletion of Nearby Young Stellar Associations
• A Cross-Match of 2MASS and SDSS: Newly-Found L and T Dwarfs and an Estimate of the Space Densitfy of T Dwarfs
• Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
• Optical Spectroscopy of 2MASS Color-Selected Ultracool Subdwarfs
• Discovery of an M9.5 Candidate Brown Dwarf in the TW Hydrae Association - DENIS J124514.1-442907
• Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass Objects in the Orion Nebula Cluster
• Identification of the TW Hya Association member 2M1235$-$39: a tertiary component of the HR 4796 system

Cited by in corpus (251)

• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Imaging Extrasolar Giant Planets
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
• Population Properties of Brown Dwarf Analogs to Exoplanets
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• The Extremely Red, Young L Dwarf PSO J318-22: A Free-Floating Planetary-Mass Analog to Directly Imaged Young Gas-Giant Planets
• BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey
• Planets Around Low-Mass Stars (PALMS). IV. The Outer Architecture of M Dwarf Planetary Systems
• The Gemini NICI Planet-Finding Campaign: The Frequency of Planets around Young Moving Group Stars
• Discovery of a warm, dusty giant planet around HIP65426
• Individual Dynamical Masses of Ultracool Dwarfs
• CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
• The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
• Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE
• A Near-IR Spectroscopic Survey of FU Orionis Objects
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• Retrieval of atmospheric properties of cloudy L dwarfs
• Three Wide Planetary-Mass Companions to FW Tau, ROXs 12, and ROXs 42B
• Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime
• SpeX Spectroscopy of Unresolved Very Low Mass Binaries. II. Identification of Fourteen Candidate Binaries with Late-M/Early-L and T Dwarf Components
• First light of the VLT planet finder SPHERE. II. The physical properties and the architecture of the young systems PZ Tel and HD 1160 revisited
• BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2
• Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3$\pi$ Survey
• Characterizing 51 Eri b from 1-5 $\mu$m: a partly-cloudy exoplanet
• On the Age of the TRAPPIST-1 System
• Planets Around Low-Mass Stars (PALMS). III. A Young Dusty L Dwarf Companion at the Deuterium-Burning Limit
• BANYAN. V. A Systematic All-Sky Survey for New Very Late-Type Low-Mass Stars and Brown Dwarfs in Nearby Young Moving Groups
• Refining the Census of the Upper Scorpius Association with Gaia
• All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• Discovery of the Young L Dwarf WISE J1741102.78-464225.5
• 1 to 2.4 micron Near-IR spectrum of the Giant Planet $\beta$ Pictoris b obtained with the Gemini Planet Imager
• The Viewing Geometry of Brown Dwarfs Influences Their Observed Colours and Variability Properties
• Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
• A Survey for New Members of the Taurus Star-Forming Region with the Sloan Digital Sky Survey
• Magellan Adaptive Optics first-light observations of the exoplanet beta Pic b. II. 3-5 micron direct imaging with MagAO+Clio, and the empirical bolometric luminosity of a self-luminous giant planet
• Observations of Disequilibrium CO Chemistry in the Coldest Brown Dwarfs
• Spectroscopic Confirmation of Young Planetary-Mass Companions on Wide Orbits
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. II. L/T Transition Atmospheres and Young Discoveries
• Atmospheres of Brown Dwarfs
• The AllWISE Motion Survey, Part 2
• A large spectroscopic sample of L and T dwarfs from UKIDSS LAS: peculiar objects, binaries, and space density
• Let the Great World Spin: Revealing the Stormy, Turbulent Nature of Young Giant Exoplanet Analogs with the Spitzer Space Telescope
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• Spectroscopic characterization of HD 95086 b with the Gemini Planet Imager
• Evidence for a circumplanetary disk around protoplanet PDS 70 b
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. II. Emergence and Sedimentation of Silicate Clouds in L Dwarfs, and Analysis of the Full M5--T9 Field Dwarf Spectroscopic Sample
• BANYAN. IX. The Initial Mass Function and Planetary-Mass Object Space Density of the TW Hya Association
• The First H-band Spectrum of the Massive Gas Giant Planet beta Pictoris b with the Gemini Planet Imager
• SDSS J111010.01+011613.1: A New Planetary-Mass T Dwarf Member of the AB Doradus Moving Group
• The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT
• The Brown Dwarf Kinematics Project (BDKP). IV. Radial Velocities of 85 Late-M and L dwarfs with MagE
• SPHERE/SHINE reveals concentric rings in the debris disk of HIP 73145
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• Magellan Adaptive Optics first-light observations of the exoplanet $\beta$ Pic b. I. Direct imaging in the far-red optical with MagAO+VisAO and in the near-IR with NICI
• In-depth study of moderately young but extremely red, very dusty substellar companion HD206893B
• Cloud Atlas: Discovery of Patchy Clouds and High-amplitude Rotational Modulations In a Young, Extremely Red L-type Brown Dwarf
• Evidence for Atmospheric Cold-trap Processes in the Noninverted Emission Spectrum of Kepler-13Ab Using HST/WFC3
• New Young Stars and Brown Dwarfs in the Upper Scorpius Association
• The Kappa Andromedae System: New Constraints on the Companion Mass, System Age & Further Multiplicity
• Search for free-floating planetary-mass objects in the Pleiades
• Spitzer Variability Properties of Low-Gravity L Dwarfs
• WISEA J114724.10-204021.3: A Free-Floating Planetary Mass Member of the TW Hya Association
• The extremely red L dwarf ULAS J222711$-$004547 - dominated by dust
• New Evidence for a Substellar Luminosity Problem: Dynamical Mass for the Brown Dwarf Binary Gl 417BC
• GPI spectra of HR 8799 c, d, and e from 1.5 to 2.4$\mu$m with KLIP Forward Modeling
• SCExAO/CHARIS Near-Infrared Direct Imaging, Spectroscopy, and Forward-Modeling of kappa And b: A Likely Young, Low-Gravity Superjovian Companion
• Surface Gravities for 228 M, L, and T Dwarfs in the NIRSPEC Brown Dwarf Spectroscopic Survey
• Physical and orbital properties of Beta Pictoris b
• A Search for Variability in Exoplanet Analogues and Low-Gravity Brown Dwarfs
• The Ultracool SpeXtroscopic Survey. I. Volume-Limited Spectroscopic Sample and Luminosity Function of M7$-$L5 Ultracool Dwarfs
• The Young L Dwarf 2MASS J11193254-1137466 is a Planetary-Mass Binary
• Trigonometric parallaxes of young field L dwarfs
• Variability of the Lowest Mass Objects in the AB Doradus Moving Group
• Photometric brown-dwarf classification. II. A homogeneous sample of 1361 L and T dwarfs brighter than J = 17.5 with accurate spectral types
• A Targeted Search for Peculiarly Red L and T Dwarfs in SDSS, 2MASS, and WISE: Discovery of a Possible L7 Member of the TW Hydrae Association
• Cloudless atmospheres for young low-gravity substellar objects
• Characterizing a Dramatic $\Delta V\sim -9$ Flare on an Ultracool Dwarf Found by the ASAS-SN Survey
• Exploring the Role of Sub-micron Sized Dust Grains in the Atmospheres of Red L0 - L6 Dwarfs
• The optical+infrared L dwarf spectral sequence of young planetary-mass objects in the Upper Scorpius association
• MASSIVE: A Bayesian analysis of giant planet populations around low-mass stars
• Substellar Objects in Nearby Young Clusters (SONYC) IX: The planetary-mass domain of Chamaeleon-I and updated mass function in Lupus-3
• A 2MASS/AllWISE Search for Extremely Red L Dwarfs -- The Discovery of Several Likely L Type Members of $\beta$ Pic, AB Dor, Tuc-Hor, Argus, and the Hyades
• ASASSN-16ae: A Powerful White-Light Flare on an Early-L Dwarf
• The Gaia Ultra-Cool Dwarf Sample -- II: Structure at the end of the main sequence
• SIMP J2154-1055: A New Low-Gravity L4$\beta$ Brown Dwarf Candidate Member of the Argus Association
• Characterization of Low-mass, Wide-separation Substellar Companions to Stars in Upper Scorpius: Near-infrared Photometry and Spectroscopy
• Planets Around Low-Mass Stars (PALMS). VI. Discovery of a Remarkably Red Planetary-Mass Companion to the AB Dor Moving Group Candidate 2MASS J22362452+4751425
• Brown Dwarfs in Young Moving Groups from Pan-STARRS1. I. AB Doradus
• SPHERE dynamical and spectroscopic characterization of HD142527B
• The Radial and Rotational Velocities of PSO J318.5338$-$22.8603, a Newly Confirmed Planetary-Mass Member of the $\beta$ Pictoris Moving Group
• A First-Look Atmospheric Modeling Study of the Young Directly-Imaged Planet-Mass Companion, ROXs 42Bb
• The Coolest Isolated Brown Dwarf Candidate Member of TWA
• New constraints on the formation and settling of dust in the atmospheres of young M and L dwarfs
• COol Companions ON Ultrawide orbiTS (COCONUTS). I. A High-Gravity T4 Benchmark around an Old White Dwarf and A Re-Examination of the Surface-Gravity Dependence of the L/T Transition
• K2 Ultracool Dwarfs Survey II: The White Light Flare Rate of Young Brown Dwarfs
• A blue depression in the optical spectra of M dwarfs
• The Broadband and Spectrally-Resolved H-band Eclipse of KELT-1b and the Role of Surface Gravity in Stratospheric Inversions in Hot Jupiters
• BANYAN. VI. Discovery of a companion at the brown dwarf/planet-mass limit to a Tucana-Horologium M dwarf
• The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-Rich Stars in the Solar Neighborhood
• High-Precision Radio and Infrared Astrometry of LSPM J1314+1320AB - II: Testing Pre--Main-Sequence Models at the Lithium Depletion Boundary with Dynamical Masses
• JWST/NIRSpec Observations of the Planetary Mass Companion TWA 27B
• The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the beta Pic Moving Group
• The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs
• Peering into the Young Planetary System AB Pic. Atmosphere, Orbit, Obliquity & Second Planetary Candidate
• A Brown Dwarf Census from the SIMP Survey
• A Census of the TW Hya Association with Gaia
• Uniform Forward-Modeling Analysis of Ultracool Dwarfs. II. Atmospheric Properties of 55 Late-T Dwarfs
• Cloud Atlas: Hubble Space Telescope Near-Infrared Spectral Library of Brown Dwarfs, Planetary-mass companions, and hot Jupiters
• The Nearest Isolated Member of the TW Hydrae Association is a Giant Planet Analog
• X-SHYNE: X-shooter spectra of young exoplanet analogs. I. A medium-resolution 0.65-2.5$\mu \mathrm{m}$ one-shot spectrum of VHS\,1256-1257 b
• An Eclipsing Substellar Binary in a Young Triple System discovered by SPECULOOS
• The ESO SupJup Survey I: Chemical and isotopic characterisation of the late L-dwarf DENIS J0255-4700 with CRIRES${}^{+}$
• Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B
• Discovery of a brown dwarf companion to the star HIP 64892
• BANYAN. VIII. New Low-Mass Stars and Brown Dwarfs with Candidate Circumstellar Disks
• The Young Substellar Companion ROXs 12 B: Near-Infrared Spectrum, System Architecture, and Spin-Orbit Misalignment
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. III. Young L Dwarf Discoveries and Proper Motion Catalogs in Taurus and Scorpius-Centaurus
• Planets Around Low-Mass Stars (PALMS). V. Age-Dating Low-Mass Companions to Members and Interlopers of Young Moving Groups
• Near-Infrared Spectroscopy of 2M0441+2301 AabBab: A Quadruple System Spanning the Stellar to Planetary Mass Regimes
• 2MASS J13243553+6358281 is an Early T-Type Planetary-Mass Object in the AB Doradus Moving Group
• Characterizing the protolunar disk of the accreting companion GQ Lupi B
• Addressing Systematics in the Traceback Age of the $\beta$ Pictoris Moving Group
• WISE2150-7520AB: A very low mass, wide co-moving brown dwarf system discovered through the citizen science project Backyard Worlds: Planet 9
• A Reanalysis of the Fundamental Parameters and Age of TRAPPIST-1
• Optical and Near-Infrared Spectra of sigma Orionis Isolated Planetary-mass Objects
• Detection of new strongly variable brown dwarfs in the L/T transition
• The VAST Survey - IV. A wide brown dwarf companion to the A3V star $\zeta$ Delphini
• Spectroscopic Follow-Up of Discoveries from the NEOWISE Proper Motion Survey
• Characterization of the Very Low Mass Secondary in the GJ 660.1AB System
• Characterization of low-mass companion HD 142527 B
• A nearby young M dwarf with a wide, possibly planetary-mass companion
• A new take on the low-mass brown dwarf companions on wide-orbits in Upper-Scorpius
• Exploring the RCrA environment with SPHERE: Discovery of a new stellar companion
• NLTT5306B: an inflated, weakly irradiated brown dwarf
• A Statistical Survey of Peculiar L and T Dwarfs in SDSS, 2MASS, and WISE
• GRAVITY K-band spectroscopy of HD 206893 B: brown dwarf or exoplanet
• A Novel Survey for Young Substellar Objects with the W-band Filter. I. Filter Design and New Discoveries in Ophiuchus and Perseus
• An Explanation of the Very Low Radio Flux of Young Planet-mass Companions
• Characterizing HR3549B using SPHERE
• Early Results from VLT-SPHERE: Long-Slit Spectroscopy of 2MASS 0122-2439B, a Young Companion Near the Deuterium Burning Limit
• The origin of free-floating planets
• Gemini Planet Imager Spectroscopy of the Dusty Substellar Companion HD 206893 B
• Discovery of a brown dwarf companion to the A3V star β Circini
• Signs of accretion in the white dwarf + brown dwarf binary NLTT5306
• SCExAO and GPI $YJH$ Band Photometry and Integral Field Spectroscopy of the Young Brown Dwarf Companion to HD 1160
• Rotation periods and photometric variability of rapidly rotating ultra-cool dwarfs
• Discovery of a Low-Mass Companion to the F7V star HD 984
• The JWST/NIRISS Deep Spectroscopic Survey for Young Brown Dwarfs and Free-Floating Planets
• A new free-floating planet in the Upper Scorpius association
• Infrared Spectroscopy of free-floating planet candidates in Upper Scorpius and Ophiuchus
• Youth analysis of near infrared spectra of young low-mass stars and brown dwarfs
• Anomalous Accretion Activity and the Spotted Nature of the DQ Tau Binary System
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• Characterization of the Benchmark Binary NLTT 33370
• A novel survey for young substellar objects with the W-band filter VI: Spectroscopic census of sub-stellar members and the IMF of $\sigma$ Orionis cluster
• Integral Field Spectroscopy of the Low-Mass Companion HD984B with the Gemini Planet Imager
• Spectral library of age-benchmark low-mass stars and brown dwarfs
• A Wide Planetary Mass Companion Discovered Through the Citizen Science Project Backyard Worlds: Planet 9
• A Novel Survey for Young Substellar Objects with the W-band filter II. The Coolest and Lowest Mass Members of the Serpens-South Star-forming Region
• PSYM-WIDE: a survey for large-separation planetary-mass companions to late spectral type members of young moving groups
• The First Brown Dwarf/Planetary-Mass Object in the 32 Orionis Group
• The Prototypical Young L/T-Transition Dwarf HD 203030B Likely Has Planetary Mass
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
• A wide planetary-mass companion to a young low-mass brown dwarf in Ophiuchus
• Evidence for SiO cloud nucleation in the rogue planet PSO J318
• Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3
• Characterising brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B
• Discovery And Characterization of Wide Binary Systems With a Very Low Mass Component
• Large Adaptive Optics Survey for Substellar Objects (LASSO) Around Young, Nearby, Low-mass Stars with Robo-AO
• Orbiting a binary: SPHERE characterisation of the HD 284149 system
• Optical and near-infrared linear polarization of low and intermediate-gravity ultra-cool dwarfs
• The continued optical to mid-IR evolution of V838 Monocerotis
• A Near-infrared Variability Survey of Young Planetary-mass Objects
• Spectral energy distribution simulations of a possible ring structure around the young, red brown dwarf G196-3B
• Exploring the planetary-mass population in the Upper Scorpius association
• Ultracool dwarf benchmarks with \emph{Gaia} primaries
• USco1621 B and USco1556 B: Two wide companions at the deuterium-burning mass limit in Upper Scorpius
• Optical Spectra of Ultracool Dwarfs with the Southern African Large Telescope
• A Dusty M5 Binary in the beta Pictoris Moving Group
• Hunting for brown dwarf binaries and testing atmospheric models with X-Shooter
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. I. An Accurate Look at the L-to-T Transition at $\sim$300 Myr from Optical through Mid-infrared Spectrophotometry
• A Late-type L Dwarf at 11 pc Hiding in the Galactic Plane Characterized Using Gaia DR2
• High signal-to-noise spectral characterization of the planetary-mass object HD 106906 b
• Revealing the Vertical Cloud Structure of a young low-mass Brown Dwarf, an analog to the beta-Pictoris b directly-imaged exoplanet, through Keck I/MOSFIRE spectro-photometric variability
• DE0823$-$49 is a juvenile binary brown dwarf at 20.7 pc
• The ESO SupJup Survey VII: Clouds and line asymmetries in CRIRES${}^{+}$ J-band spectra of the Luhman 16 binary
• Spectroscopic substellar initial mass function of NGC 2244
• The $\text{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\text{Gaia}$ DR2 ultra-cool dwarf
• L-band Spectroscopy with Magellan-AO/Clio2: First Results on Young Low-Mass Companions
• The Occurrence Rate of Quiescent Radio Emission for Ultracool Dwarfs using a Generalized Semi-Analytical Bayesian Framework
• Discovery of 16 New Members of the Solar Neighborhood using Proper Motions from CatWISE2020
• Spectral Variability of Two Rapidly Rotating Brown Dwarfs: 2MASS J08354256-0819237 and 2MASS J18212815+1414010
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• Individual Dynamical Masses of DENIS J063001.4$-$184014AB Reveal A Likely Young Brown Dwarf Triple
• A New Method for Characterizing Very-Low-Mass Companions with Low Resolution Near-Infrared Spectroscopy
• BANYAN. X. Discovery of a wide, low-gravity L-type companion to a fast-rotating M3 dwarf
• Strong H$\alpha$ emission in the young planetary mass companion 2MASS J0249-0557 c
• A Comparative L-dwarf Sample Exploring the Interplay Between Atmospheric Assumptions and Data Properties
• Synergies of THESEUS with the large facilities of the 2030s and guest observer opportunities
• Mapping the Skies of Ultracool Worlds: Detecting Storms and Spots with Extremely Large Telescopes
• Euclid Quick Data Release (Q1) -- Spectroscopic search, classification and analysis of ultracool dwarfs in the Deep Fields
• Radial Velocities, Space Motions, and Nearby Young Moving Group Memberships of Eleven Candidate Young Brown Dwarfs
• CWISE J014611.20-050850.0AB: The Widest Known Brown Dwarf Binary in the Field
• Spectral characterization of young LT dwarfs
• A focus on L dwarfs with trigonometric parallaxes
• 2MASS J11151597+1937266: A Young, Dusty, Isolated, Planetary-Mass Object with a Potential Wide Stellar Companion
• Detecting free-floating planets using water-depend colour terms in the next generation of infrared space-based surveys
• Spectroscopy of Candidate Members of the Sco-Cen Complex
• The first spectroscopically confirmed brown dwarfs in NGC 2264
• Confirming the least massive members of the Pleiades star cluster
• Testing the existence of optical linear polarization in young brown dwarfs
• X-SHYNE: X-Shooter spectra of young exoplanet analogs II. Presentation and analysis of the full library
• 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
• Discovery of Young Methane Dwarfs in the Rho Ophiuchi L 1688 Dark Cloud
• A Novel Survey for Young Substellar Objects with the W band Filter.V. IC 348 and Barnard 5 in the Perseus Cloud
• A Novel Survey for Young Substellar Objects with the W-band filter III: Searching for very low mass brown dwarfs in Serpens South and Serpens Core
• JWST/MIRI observations of the young TWA 27 system: hydrocarbon disk chemistry, silicate clouds, evidence for a CPD
• The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions
• CFBDS J111807-064016: A new L/T transition brown dwarf in a binary system
• $L$-band Spectra of Young Brown Dwarfs
• The substellar population in Corona Australis
• Large Scale Searches for Brown Dwarfs and Free-Floating Planets
• Near-infrared spectroscopic characterisation of Gaia ultra-cool dwarf candidates; Spectral types and peculiarities
• 2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the $\beta$ Pictoris Moving Group
• M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy
• Probing Late-type T dwarf J-H Color Outliers for Signs of Age
• Near-infrared spectra of the inflated post-common envelope brown dwarf NLTT 5306B
• Discovery of a brown dwarf with quasi-spherical mass-loss
• Discovery of an L4$\beta$ Candidate Member of Argus in the Planetary Mass Regime: WISE J231921.92+764544.4
• SDSS J100711.74+193056.2: A Candidate Common Motion Substellar Companion to the Nearest B-Type Star Regulus
• Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
• The Brown Dwarf Kinematics Project (BDKP). V. Radial and Rotational Velocities of T Dwarfs from Keck/NIRSPEC High-Resolution Spectroscopy
• Metal-Depleted Brown Dwarfs
• Radial Velocities of Low-mass Candidate TWA Members
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs
• On The Unusual Variability of 2MASS J06195260-2903592: A Long-Lived Disk around a Young Ultracool Dwarf
• Panchromatic View of the Frigid Jovian Exoplanet COCONUTS-2 b
• Disentangling the Effects of Temperature, Clouds, and Gravity on K I doublet in L dwarfs
• Investigating 2M1155-7919B: a Nearby, Young, Low-Mass Star Actively Accreting from a Nearly Edge-on, Dusty Disk
• Disentangling the Signatures of Blended-Light Atmospheres in L/T Transition Brown Dwarfs
• Using Old and New Approaches: Determining Physical Properties of Brown Dwarfs with Empirical Relations and Machine Learning Models
• Substellar Hyades Candidates from the UKIRT Hemisphere Survey
• JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b reveals Clouds and Possible Metal Enrichment
• JWST NIRSpec Spectral Standards for M, L, and T Dwarfs and Subdwarfs