Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)

Abstract

We present JHKs photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey. One of the goals of this new search was to locate more examples of the latest L dwarfs. Of the 67 new discoveries, 17 have types of L6 or later. Analysis of these new discoveries shows that H-alpha emission has yet to be convincingly detected in any L dwarf later than type L4.5, indicating a decline or absence of chromospheric activity in the latest L dwarfs. Further analysis shows that 16 (and possibly 4 more) of the new L dwarfs are lithium brown dwarfs and that the average line strength for those L dwarfs showing lithium increases until roughly type L6.5 V then declines for later types. This disappearance may be the first sign of depletion of atomic lithium as it begins to form into lithium-bearing molecules. Another goal of the search was to locate nearer, brighter L dwarfs of all subtypes. Using absolute magnitudes for 17 L dwarf systems with trigonometric parallax measurements, we develop spectrophotometric relations to estimate distances to the other L dwarfs. Of the 67 new discoveries, 21 have photometric distances placing them within 25 parsecs of the Sun. A table of all known L and T dwarfs believed to lie within 25 parsecs - 53 in total - is also presented. Using the distance measurement of the coolest L dwarf known, we calculate that the gap in temperature between L8 and the warmest known T dwarfs is less than 350K and probably much less. If the transition region between the two classes spans a very small temperature interval, this would explain why no transition objects have yet been uncovered. This evidence, combined with model fits to low-resolution spectra of late-M and early-L dwarfs, indicates that L dwarfs span the range 1300K < Teff < 2000K.

To appear in AJ July 2000; 18 pages of text (LaTeX), 19 pages of figures (.jpg and .ps), 9 pages of tables (.ps and LaTeX); Tables 1 and 2 are in landscape mode

References in corpus (16)

• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Chemical Equilibrium Abundances in Brown Dwarf and Extrasolar Giant Planet Atmospheres
• Atmospheric, Evolutionary, and Spectral Models of the Brown Dwarf Gliese 229 B
• Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B
• L Dwarfs and the Substellar Mass Function
• The Discovery of a Field Methane Dwarf from Sloan Digital Sky Survey Commissioning Data
• Four nearby L dwarfs
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Imaging Data
• Discovery of a Low-Mass Brown Dwarf Companion of the Young Nearby Star G196-3
• Spectral evidence for dust in late-type M dwarfs
• The Discovery of a Second Field Methane Brown Dwarf from Sloan Digital Sky Survey Commissioning Data
• Keck Imaging of Binary L Dwarfs
• Revised Fluxes for Gliese 229B
• K-Band Spectra and Narrowband Photometry of DENIS Field Brown Dwarfs
• An Improved Red Spectrum of the Methane or T-dwarf SDSS 1624+0029: Role of the Alkali Metals
• Near-Infrared Spectroscopy of the Cool Brown Dwarf, SDSS 1624+00

Cited by in corpus (420)

• Galactic Stellar and Substellar Initial Mass Function
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• The Theory of Brown Dwarfs and Extrasolar Giant Planets
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• An Infrared Spectroscopic Sequence of M, L and T Dwarfs
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: the Effects of Temperature, Clouds, and Gravity
• A Unified Near Infrared Spectral Classification Scheme for T Dwarfs
• Towards Spectral Classification of L and T Dwarfs: Infrared and Optical Spectroscopy and Analysis
• The prevalence of dust on the exoplanet HD 189733b from Hubble and Spitzer observations
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• Characterization of M,L and T dwarfs in the Sloan Digital Sky Survey
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• Meeting the Cool New Neighbors V: A 2MASS-Selected Sample of Ultracool Dwarfs
• A Catalog of Northern Stars With Annual Proper Motions Larger Than 0.15 Seconds of Arc (LSPM catalog - North)
• L and T Dwarf Models and the L to T Transition
• 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
• Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• Brown Dwarf Companions to G-type Stars. I: Gliese 417B and Gliese 584C
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• Detection of Nine M8.0-L0.5 Binaries: The Very Low Mass Binary Population and its Implications for Brown Dwarf and VLM Star Formation
• Atmospheric Parameters of Field L and T Dwarfs
• The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra
• The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
• Infrared Photometry of Late-M, L, and T Dwarfs
• Seventy-One New L and T Dwarfs from the Sloan Digital Sky Survey
• Discoveries from a Near-infrared Proper Motion Survey using Multi-epoch 2MASS Data
• Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• Beyond the T Dwarfs: Theoretical Spectra, Colors, and Detectability of the Coolest Brown Dwarfs
• BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• The Brown Dwarf Kinematics Project (BDKP) I. Proper Motions and Tangential Velocities for a Large Sample of Late-type M, L and T Dwarfs
• The Discovery of a Luminous z=5.80 Quasar from the Sloan Digital Sky Survey
• Infrared Spectra and Spectral Energy Distributions of Late-M- and L-Dwarfs
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• The "Mysterious" Origin of Brown Dwarfs
• Weather on Other Worlds. II. Survey Results: Spots Are Ubiquitous on L and T Dwarfs
• Population Properties of Brown Dwarf Analogs to Exoplanets
• Evidence for Cloud Disruption in the L/T Dwarf Transition
• Ultradeep Near-Infrared ISAAC Observations of the HDF-S: Observations, Reduction, Multicolor Catalog, and Photometric Redshifts
• Infrared Spectroscopy of Substellar Objects in Orion
• Brown Dwarfs and the TW Hya Association
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution optical spectroscopy
• A search for L dwarf binary systems
• Radio Observations of a Large Sample of Late-M, L, and T Dwarfs: The Distribution of Magentic Field Strengths
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Spitzer Infrared Spectrograph Observations of M, L, and T Dwarfs
• Discovery of a Very Young Field L Dwarf, 2MASS J01415823-4633574
• BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• Low Luminosity Companions to White Dwarfs
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
• Exploring brown dwarf disks: A 1.3 mm survey in Taurus
• Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs
• Hubble Space Telescope Observations of Binary Very-Low-Mass Stars and Brown Dwarfs
• Line Intensities and Molecular Opacities of the FeH $F^4{\Delta }_i-X^4{\Delta }_i$ Transition
• Activity and Kinematics of Ultracool Dwarfs Including An Amazing Flare Observation
• Individual Dynamical Masses of Ultracool Dwarfs
• Spitzer/IRAC Photometry of M, L, and T Dwarfs
• Near-Infrared Spectral Classification of late-M and L Dwarfs
• Calculations of the Far-Wing Line Profiles of Sodium and Potassium in the Atmospheres of Substellar-Mass Objects
• Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features
• Binaries and the L Dwarf/T Dwarf Transition
• Mid-Infrared Photometry of Cold Brown Dwarfs: Diversity in Age, Mass and Metallicity
• Flaring Up All Over -- Radio Activity in Rapidly-Rotating Late-Type M and L Dwarfs
• A Disk Census for Young Brown Dwarfs
• The Spectra of T Dwarfs. II. Red Optical Data
• 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
• Subtle Signatures of Multiplicity in Late-type Dwarf Spectra: The Unresolved M8.5 + T5 Binary 2MASS J03202839-0446358
• Dynamical Mass of the Substellar Benchmark Binary HD 130948BC
• The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
• Discovery of 11 New T Dwarfs in the Two Micron All-Sky Survey, Including a Possible L/T Transition Binary
• Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich?
• Variability in ultra cool dwarfs: evidence for the evolution of surface features
• Dust in the Photospheric Environment: Unified Cloudy Models of M, L, and T Dwarfs
• A library of near-infrared integral field spectra of young M-L dwarfs
• Gravity Indicators in the Near-Infrared Spectra of Brown Dwarfs
• Colors and Kinematics of L Dwarfs From the Sloan Digital Sky Survey
• 2MASSJ035523.51+113337.4: A Young, Dusty, Nearby, Isolated Brown Dwarf Resembling A Giant Exoplanet
• SDSS J1534+1615AB: A Novel T Dwarf Binary Found with Keck Laser Guide Star Adaptive Optics and the Potential Role of Binarity in the L/T Transition
• High resolution spectroscopy of ultracool M dwarfs
• L-dwarf variability: I-band observations
• Evidence for Circumstellar Disks around Young Brown Dwarfs in the Trapezium Cluster
• The AllWISE Motion Survey and The Quest for Cold Subdwarfs
• A search for binary systems among the nearest L dwarfs
• HD 203030B: an Unusually Cool Young Sub-Stellar Companion near the L/T Transition
• Clouds, Gravity and Metallicity in Blue L dwarfs: The Case of 2MASS J11263991-5003550
• Retrieval of atmospheric properties of cloudy L dwarfs
• Substellar Companions to Main Sequence Stars: No Brown Dwarf Desert at Wide Separations
• New CrH Opacities for the Study of L and Brown Dwarf Atmospheres
• The Solar Neighborhood X: New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs
• Brown Dwarf Photospheres are Patchy: A Hubble Space Telescope Near-infrared Spectroscopic Survey Finds Frequent Low-level Variability
• JHK Magnitudes for L and T Dwarfs and Infrared Photometric Systems
• A Cross-Match of 2MASS and SDSS: Newly-Found L and T Dwarfs and an Estimate of the Space Densitfy of T Dwarfs
• A Study of the Luminosity and Mass Functions of the Young IC 348 Cluster using FLAMINGOS Wide-Field Near-Infrared Images
• SpeX Spectroscopy of Unresolved Very Low Mass Binaries. II. Identification of Fourteen Candidate Binaries with Late-M/Early-L and T Dwarf Components
• Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime
• T Dwarfs and the Substellar Mass Function. I. Monte Carlo Simulations
• Hokupa'a-Gemini Discovery of Two Ultracool Companions to the Young Star HD 130948
• Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3$\pi$ Survey
• Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
• First Detection of Millimeter Dust Emission from Brown Dwarf Disks
• Crossing the Brown Dwarf Desert Using Adaptive Optics: A Very Close L-Dwarf Companion to the Nearby Solar Analog HR 7672
• Auroral radio emission from late L and T dwarfs: A new constraint on dynamo theory in the substellar regime
• The 2MASS Wide-Field T Dwarf Search. IV Unting out T dwarfs with Methane Imaging
• The Galactic disk mass-budget : II. Brown dwarf mass-function and density
• Multiplicity Amongst Wide Brown Dwarf Companions to Nearby Stars: Gliese 337CD
• A Flaring L5 Dwarf: The Nature of HαEmission in Very Low Mass (Sub)Stellar Objects
• HS2331+3905: The cataclysmic variable that has it all
• Three Wide-Separation L dwarf Companions from the Two Micron All Sky Survey: Gl 337C, Gl 618.1B, and HD 89744B
• BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L dwarfs
• Spectroscopic rotational velocities of brown dwarfs
• Planets Around Low-Mass Stars (PALMS). III. A Young Dusty L Dwarf Companion at the Deuterium-Burning Limit
• Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination of a Binary T Dwarf
• Theoretical Spectral Models of T Dwarfs at Short Wavelengths and Their Comparison with Data
• BANYAN. V. A Systematic All-Sky Survey for New Very Late-Type Low-Mass Stars and Brown Dwarfs in Nearby Young Moving Groups
• Meeting the Cool Neighbors III: Spectroscopy of Northern NLTT Stars
• The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-ray, and H-alpha Observations
• 17 new very low-mass members in Taurus. The brown dwarf deficit revisited
• Discovery of a Highly Unequal-Mass Binary T Dwarf with Keck Laser Guide Star Adaptive Optics: A Coevality Test of Substellar Theoretical Models and Effective Temperatures
• On the Distribution of Orbital Eccentricities for Very Low-Mass Binaries
• Optical Spectroscopy of 2MASS Color-Selected Ultracool Subdwarfs
• The Dynamical Mass and Three-Dimensional Orbit of HR7672B: A Benchmark Brown Dwarf with High Eccentricity
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• The orbit of the brown dwarf binary Gl 569B
• Cloud busting: enstatite and quartz clouds in the atmosphere of 2M2224-0158
• 2MASS J05185995-2828372: Discovery of an Unresolved L/T Binary
• Kelu-1 is a Binary L Dwarf: First Brown Dwarf Science from Laser Guide Star Adaptive Optics
• Doppler Imaging of Exoplanets and Brown Dwarfs
• The lithium depletion boundary and the age of the Hyades cluster
• Epsilon Indi Ba, Bb: a detailed study of the nearest known brown dwarfs
• Discovery of a Second L Subdwarf in the Two Micron All Sky Survey
• The 2MASS Wide-Field T Dwarf Search. I. Discovery of a Bright T Dwarf Within 10 pc of the Sun
• A Volume-limited Sample of 63 M7--M9.5 Dwarfs I. Space Motion, Kinematic Age, and Lithium
• A Possible Brown Dwarf Companion to the White Dwarf GD1400
• Discovery of new nearby L and late-M dwarfs at low Galactic latitude from the DENIS database
• First determination of the dynamical mass of a binary L dwarf
• The Onset of Methane in L Dwarfs
• The Solar Neighborhood IX: Hubble Space Telescope Detections of Companions to Five M and L Dwarfs within 10 pc of the Sun
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE. II. L/T Transition Atmospheres and Young Discoveries
• The AllWISE Motion Survey, Part 2
• The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
• Discovery of an Unusually Red L-type Brown Dwarf
• A large spectroscopic sample of L and T dwarfs from UKIDSS LAS: peculiar objects, binaries, and space density
• Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
• Let the Great World Spin: Revealing the Stormy, Turbulent Nature of Young Giant Exoplanet Analogs with the Spitzer Space Telescope
• An Adaptive Optics Search for Companions to Stars with Planets
• The χFactor: Determining the Strength of Activity in Low Mass Dwarfs
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• Chemistry of Low Mass Substellar Objects
• The brown dwarf desert as a consequence of orbital migration
• NICS-TNG low-resolution 0.85-2.45um spectra of L-Dwarfs: a near-infrared spectral classification scheme for faint dwarfs
• The Best Brown Dwarf Yet?: A Companion to the Hyades Eclipsing Binary V471 Tau
• 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
• A Panchromatic View of Brown Dwarf Aurorae
• Near-Infrared Photometric Variability of Stars Toward the Chamaeleon I Molecular Cloud
• Finding ultracool brown dwarfs with MegaCam on CFHT: method and first results
• Nearby M, L, and T Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
• A new benchmark T8-9 brown dwarf and a couple of new mid-T dwarfs from the UKIDSS DR5+ LAS
• Photometric Variability at the L/T Dwarf Boundary
• Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions
• The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
• AKARI Observations of Brown Dwarfs. III. CO, CO2 and CH4 Fundamental Bands and Physical Parameters
• Spectroscopic classification of red high proper motion objects in the Southern Sky
• The discovery of a very cool binary system
• Southern Infrared Proper Motion Survey I: Discovery of New High Proper Motion Stars From First Full Hemisphere Scan
• Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties
• The ultracool-field dwarf luminosity-function and space density from the Canada-France Brown Dwarf Survey
• Periodic photometric variability of the brown dwarf Kelu-1
• The Brown Dwarf Kinematics Project (BDKP). IV. Radial Velocities of 85 Late-M and L dwarfs with MagE
• Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass Objects in the Orion Nebula Cluster
• The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT
• Nearby stars from the LSPM-north Proper Motion Catalog. I. Main Sequence Dwarfs and Giants Within 33 Parsecs of the Sun
• The substellar population of the young cluster lambda Orionis
• A Survey for H-alpha Emission from Late L dwarfs and T dwarfs
• Space Velocities of L- and T-type Dwarfs
• The Long-Lived Disks in the Eta Chamaeleontis Cluster
• Stars in the Hubble Ultra Deep Field
• Spectroscopic characterization of 78 DENIS ultracool dwarf candidates in the solar neighborhood and the Upper Sco OB association
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• Transition from L to T Dwarfs on the Color-Magnitude Diagram
• The dependence of the sub-stellar IMF on the initial conditions for star formation
• EXOPLINES: Molecular Absorption Cross-Section Database for Brown Dwarf and Giant Exoplanet Atmospheres
• An Infrared High Proper Motion Survey Using 2MASS and SDSS: Discovery of M, L and T Dwarfs
• Optical Linear Polarization of Late M- and L-Type Dwarfs
• Search for free-floating planetary-mass objects in the Pleiades
• Discovery of a High Proper Motion L Dwarf Binary: 2MASS J15200224-4422419AB
• Parallaxes of Southern Extremely Cool objects (PARSEC) II: Spectroscopic Follow-up and Parallaxes of 52 Targets
• Discovery of a Young L Dwarf Binary, SDSS J224953.47+004404.6AB
• The Decay of Accreting Triple Systems as Brown Dwarf Formation Scenario
• New Evidence for a Substellar Luminosity Problem: Dynamical Mass for the Brown Dwarf Binary Gl 417BC
• The brown dwarf population in the Chamaeleon I cloud
• NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results
• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• The Structure of Brown Dwarf Circumstellar Disks
• The Formation of Cataclysmic Variables with Brown Dwarf Secondaries
• Surface Gravities for 228 M, L, and T Dwarfs in the NIRSPEC Brown Dwarf Spectroscopic Survey
• SDSS J150722.30+523039.8: a CV formed directly from a detached white dwarf/brown dwarf binary?
• The Y-Band at 1.035 um: Photometric Calibration and the Dwarf Stellar/Sub-Stellar Color Sequence
• Extending the Canada-France brown Dwarfs Survey to the near-infrared: first ultracool brown dwarfs from CFBDSIR
• Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs
• On the Radii of Brown Dwarfs Measured with AKARI Near-Infrared Spectroscopy
• Analysis of Keck HIRES spectra of early L-type dwarfs
• Discovery of a Wide Substellar Companion to a Nearby Low-Mass Star
• The Gaia Ultracool Dwarf Sample. I. Known L and T dwarfs and the first Gaia data release
• Discovery of a Tight Brown Dwarf Companion to the Low Mass Star LHS 2397a
• No disks around low-mass stars and brown dwarfs in the young sigma Orionis cluster?
• First results from the Canada-France High-z Quasar Survey: Constraints on the z=6 quasar luminosity function and the quasar contribution to reionization
• Dust in the Photospheric Environment II. Effect on the Near Infrared Spectra of L and T Dwarfs
• 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
• SDSS J080531.84+481233.0: An Unresolved L Dwarf/T Dwarf Binary
• Spectral Classification and Effective Temperatures of L and T Dwarfs Based of Near-Infrared Spectra
• Trigonometric parallaxes of young field L dwarfs
• Atmospheric Analysis of the M/L- and M/T-Dwarf Binary Systems LHS 102 and Gliese 229
• Pleiades low-mass brown dwarfs: the cluster L dwarf sequence
• A 2MASS L Dwarf Companion to the Nearby K Dwarf GJ 1048
• Discovery of An Unusually Blue L Dwarf Within 10 pc of the Sun
• The sub-stellar birth rate from UKIDSS
• 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
• Limits on the infrared photometric monitoring of brown dwarfs
• A Cross-Match of 2MASS and SDSS. II. Peculiar L Dwarfs, Unresolved Binaries, and the Space Density of T Dwarf Secondaries
• Exploring the Role of Sub-micron Sized Dust Grains in the Atmospheres of Red L0 - L6 Dwarfs
• Optical Linear Polarimetry of Ultra Cool Dwarfs
• S Ori 70: Just a Foreground Field Brown Dwarf?
• Spectroscopy of planetary mass brown dwarfs in Orion
• Southern Infrared Proper Motion Survey II: A sample of low mass stars with μ> 0.1''/yr
• Proper motions of field L and T dwarfs
• Characterization of High Proper Motion Objects from the Wide-field Infrared Survey Explorer
• Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
• 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
• A Search for Variability in the Active T dwarf 2MASS 1237+6526
• Cool Companions to White Dwarfs from the 2MASS Second Incremental Data Release
• A ZZ Ceti white dwarf in SDSS J133941.11+484727.5
• An Adaptive Optics Survey of M6.0-M7.5 Stars: Discovery of Three Very Low Mass Binary Systems Including Two Probable Hyades Members
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Data II. Hobby-Eberly Telescope Observations
• Characterization of the Nearby L/T Binary Brown Dwarf WISE J104915.57-531906.1 at 2 Parsecs from the Sun
• Cool Companions to White Dwarf Stars from the Two Micron All Sky Survey All Sky Data Release
• X-ray Luminosities of Optically-Selected Cataclysmic Variables and Application to the Galactic Ridge X-ray Emission
• A possible third component in the L dwarf binary system DENIS-P J020529.0-115925 discovered with the Hubble Space Telescope
• The Dawes Review 3: The Atmospheres of Extrasolar Planets and Brown Dwarfs
• A Search for molecules in the atmosphere of HD 189733b
• Discovery of the first wide L dwarf + giant binary system and eight other ultra-cool dwarfs in wide binaries
• Discovery of a 66 mas Ultracool Binary with Laser Guide Star Adaptive Optics
• HST, VLT, and NTT imaging search for wide companions to bona-fide and candidate brown dwarfs in the Cha I dark cloud
• A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries
• SSSPMJ0829-1309: A new nearby L dwarf detected in SuperCOSMOS Sky Surveys
• Barnes-Evans relations for dwarfs with an application to the determination of distances to cataclysmic variables
• Discovery of a Very Low Mass Triple with Late-M and T Dwarf Components: LP 704-48/SDSS J0006-0852AB
• A Search for Photometric Variability in L and T type Brown Dwarf Atmospheres
• On the kinematic age of brown dwarfs: Radial velocities and space motions of 43 nearby L dwarfs
• A Signature of Chromospheric Activity in Brown Dwarfs Revealed by 2.5-5.0 Micron AKARI Spectra
• The Mass-Luminosity Relation in the L/T Transition: Individual Dynamical Masses for the New J-Band Flux Reversal Binary SDSSJ105213.51+442255.7AB
• 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
• Identification of a Wide, Low-Mass Multiple System Containing the Brown Dwarf 2MASS J0850359+105716
• Photometric variability of a young, low-mass brown dwarf
• 2MASSI J1315309-264951: An L Dwarf with Strong and Variable H-alpha Emission
• Adaptive optics imaging survey of the Tucana-Horologium association
• Calibration of the MEarth Photometric System: Optical Magnitudes and Photometric Metallicity Estimates for 1802 Nearby M-dwarfs
• The Hyperactive L Dwarf 2MASS J13153094-2649513: Continued Emission and a Brown Dwarf Companion
• The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type Dwarfs
• A Mini-survey of Ultracool Dwarfs at 4.9 GHz
• The low-mass companion of GQ Lup
• On the Nature of the Unique H$\alpha$-Emitting T Dwarf 2MASS J12373919+6526148
• Rotational Modulation of M/L Dwarfs due to Magnetic Spots
• LSR0602+3910 - Discovery of a Bright Nearby L-type Brown Dwarf
• Adaptive Optics Imaging and Spectroscopy of Cygnus A: I. Evidence for a Minor Merger
• Cloud Atlas: Hubble Space Telescope Near-Infrared Spectral Library of Brown Dwarfs, Planetary-mass companions, and hot Jupiters
• The UKIDSS-2MASS Proper Motion Survey I: Ultracool dwarfs from UKIDSS DR4
• Search for nearby stars among proper motion stars selected by optical-to-infrared photometry. II. Two late M dwarfs within 10 pc
• SDSS J125637-022452: a high proper motion L subdwarf
• Cloud Atlas: Discovery of Rotational Spectral Modulations in a Low-mass, L-type Brown Dwarf Companion to a Star
• The Second Arecibo Search for 5 GHz Radio Flares from Ultracool Dwarfs
• New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools: Part I: UKIDSS LAS DR5 vs SDSS DR7
• High-z massive galaxies in the HDF-South
• Spectroscopic Discovery of Brown Dwarf-like Secondary Stars in the Cataclysmic Variables LL And and EF Eri
• Discovery of Four High Proper Motion L Dwarfs, Including a 10 pc L Dwarf at the L/T Transition
• Identifying Ultra-Cool Dwarfs at Low Galactic Latitudes: A Southern Candidate Catalogue
• The 5 GHz Arecibo Search for Radio Flares from Ultracool Dwarfs
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph -- III. Dust Grains in Young L Dwarf Atmospheres Are Heavier
• Evidence of Orbital Motion in the Binary Brown Dwarf Kelu-1AB
• Hubble Space Telescope Imaging and Spectral Analysis of Two Brown Dwarf Binaries at the L Dwarf/T Dwarf Transition
• Infrared Parallaxes of Young Field Brown Dwarfs and Connections to Directly Imaged Gas-Giant Exoplanets
• Effective Temperatures of late L dwarfs and the onset of Methane signatures
• Discovery of a Visual T-Dwarf Triple System and Binarity at the L/T Transition
• New nearby stars selected in a high proper motion survey by DENIS photometry
• New Young Brown Dwarfs in the Orion Molecular Cloud 2/3 Region
• Visual orbit of GJ 164 AB
• Discovery of two new accreting pulsating white dwarf stars
• Very Low Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS IV: A Candidate Brown Dwarf or Low-Mass Stellar Companion to HIP 67526
• Explaining the Observed Polarization from Brown Dwarfs by Single Dust Scattering
• WISEP J180026.60+013453.1: A Nearby Late L Dwarf Near the Galactic Plane
• A Near-Infrared Wide-Field Proper Motion Search for Brown Dwarfs
• L-Band Photometry of L and T Dwarfs
• Discovery of three nearby L dwarfs in the Southern Sky
• A new Classical T Tauri object at the sub-stellar boundary in Chamaeleon II
• Spectral and atmospheric characterisation of a new benchmark brown dwarf HD13724B
• Lithium in the Hyades L5 brown dwarf 2MASSJ04183483+2131275
• A Statistical Survey of Peculiar L and T Dwarfs in SDSS, 2MASS, and WISE
• Moderate Resolution Spitzer Infrared Spectrograph (IRS) Observations of M, L, and T Dwarfs
• Near-IR coronagraphic imaging of the companion to HR 7672
• Resolved Hubble Space spectroscopy of ultracool binary systems
• Obscured clusters. II. GLIMPSE-C02 - A new metal rich globular cluster in the Milky Way
• Discovery of a Methane Dwarf from the IfA-Deep Survey
• Gemini Planet Imager Spectroscopy of the Dusty Substellar Companion HD 206893 B
• $K2$ Ultracool Dwarfs Survey. VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
• CLOUDS search for variability in brown dwarf atmospheres
• Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B
• Initial mass function effects on the colour evolution of disk galaxies
• Infrared and kinematic properties of the substellar object G 196-3B
• Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations
• Atomic lines in infrared spectra for ultracool dwarfs
• Weather on Other Worlds. III. A Survey for T Dwarfs with High Amplitude Optical Variability
• CORMASS: A Compact and Efficient NIR Spectrograph for Studying Low-Mass Objects
• Near-Infrared Spectroscopy of Brown Dwarfs: Methane and the Transition between the L and T Spectral Types
• Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs
• Discovery of Two Very Wide Binaries with Ultracool Companions and a New Brown Dwarf at the L/T Transition
• Weather on Other Worlds. IV. H$\alpha$ emission and photometric variability are not correlated in L0$-$T8 dwarfs
• VLT X-shooter spectroscopy of the nearest brown dwarf binary
• A dusty benchmark brown dwarf near the ice line of HD 72946
• Resolved Spectroscopy of M Dwarf/L Dwarf Binaries. IV. Discovery of an M9 + L6 BInary Separated by Over 100 AU
• Follow-up observations of binary ultra-cool dwarfs
• The ages of L dwarfs
• A search for southern ultracool dwarfs in young moving groups
• On the existence of brown dwarfs more massive than the hydrogen burning limit
• Testing the fragmentation limit in the Upper Sco association
• Using Narrow Band Photometry to Detect Young Brown Dwarfs in IC348
• Spectroscopic follow-up of L- and T-type proper-motion member candidates in the Pleiades
• Constraints on Star Forming Galaxies at z> 6.5 from HAWK-I Y-band Imaging of GOODS-South
• Atmospheric electrification in dusty, reactive gases in the solar system and beyond
• K2-288Bb: A Small Temperate Planet in a Low-mass Binary System Discovered by Citizen Scientists
• The Late-Type Extension to MoVeRS (LaTE-MoVeRS): Proper motion verified low-mass stars and brown dwarfs from SDSS, 2MASS, and WISE
• Binarity at the L/T brown dwarf transition
• H and K Band Methane Features in an L Dwarf, 2MASS 0920+35
• 5-micron photometry of late-type dwarfs
• Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
• Calibrating Ultracool Dwarfs: Optical Template Spectra, Bolometric Corrections, and $\chi$ Values
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Resolved Spectroscopy of M Dwarf/L Dwarf Binaries. III. The "Wide" L3.5/L4 Dwarf Binary 2MASS J15500845+1455180AB
• Discovery of a Late L Dwarf: WISEP J060738.65+242953.4
• Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3
• Discovery And Characterization of Wide Binary Systems With a Very Low Mass Component
• Ultracool dwarfs in Gaia DR3
• Orbiting a binary: SPHERE characterisation of the HD 284149 system
• High contrast optical imaging of companions: the case of the brown dwarf binary HD-130948BC
• 2MASS J03105986+1648155AB - A new binary at the L/T transition
• A new L5 brown dwarf member of the Hyades cluster with chromospheric activity
• Spectral energy distribution simulations of a possible ring structure around the young, red brown dwarf G196-3B
• Rotation-disk connection for very low mass and substellar objects in the Orion Nebula Cluster
• Luminosity Functions of Young Clusters: Modeling the Substellar Mass Regime
• Young Stars and Outflows in the globule IC1396W
• On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae
• Radial Velocity Variability of Field Brown Dwarfs
• An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster
• An Age Constraint for the Very Low-Mass Stellar/Brown Dwarf Binary 2MASS J03202839-0446358AB
• Optical Spectra of Ultracool Dwarfs with the Southern African Large Telescope
• The first spectroscopically identified L dwarf in Praesepe
• A search for lithium in metal-poor L dwarfs
• DE0823$-$49 is a juvenile binary brown dwarf at 20.7 pc
• Revealing the Vertical Cloud Structure of a young low-mass Brown Dwarf, an analog to the beta-Pictoris b directly-imaged exoplanet, through Keck I/MOSFIRE spectro-photometric variability
• New brown dwarf companions to dM(e) stars
• Properties of ultra-cool dwarfs with Gaia. An assessment of the accuracy for the temperature determination
• A Search for z=7.3 Lyα Emitters behind Gravitationally Lensing Clusters
• Using Narrow Band Photometry to Classify Stars and Brown Dwarfs
• The Occurrence Rate of Quiescent Radio Emission for Ultracool Dwarfs using a Generalized Semi-Analytical Bayesian Framework
• The Origins of the Substellar Companion to GQ Lup
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• Direct Imaging discovery of a second planet candidate around the possibly transiting planet host CVSO 30
• Young Stellar Objects in NGC 6823
• The search for planetary mass companions to field brown dwarfs with HST/NICMOS
• A Comparative L-dwarf Sample Exploring the Interplay Between Atmospheric Assumptions and Data Properties
• Properties of the solar neighbor WISE J072003.20-084651.2
• High resolution spectroscopy of Brown Dwarfs in Taurus: Detection of accretion in KPNO Tau 3
• A k-NN Method to Classify Rare Astronomical Sources: Photometric Search of Brown Dwarfs with Spitzer/IRAC
• BANYAN. X. Discovery of a wide, low-gravity L-type companion to a fast-rotating M3 dwarf
• Strong H$\alpha$ emission in the young planetary mass companion 2MASS J0249-0557 c
• Interpreting the M22 Spike Events
• Euclid Quick Data Release (Q1) -- Spectroscopic search, classification and analysis of ultracool dwarfs in the Deep Fields
• A deep wide-field optical survey in the young open cluster Collinder 359
• L dwarfs detection from SDSS images using improved Faster R-CNN
• A focus on L dwarfs with trigonometric parallaxes
• Astrometry Survey Missions Beyond the Magnitude Limit
• Increasing the census of L and T dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
• Probing the Substellar Regime with SIRTF
• Confirming the least massive members of the Pleiades star cluster
• Discovery of a Possible Cool White Dwarf Companion from the AllWISE Motion Survey
• Discovery of Young Methane Dwarfs in the Rho Ophiuchi L 1688 Dark Cloud
• NICMOS Kernel-Phase Interferometry I: Catalogue of Brown Dwarfs Observed in F110W and F170M
• COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf
• X-SHYNE: X-Shooter spectra of young exoplanet analogs II. Presentation and analysis of the full library
• The Globular Cluster Content of Maffei 1
• Weather on Other Worlds. VI. Optical Spectrophotometry of Luhman 16B Reveals Large-amplitude Variations in the Alkali Lines
• A deep, wide-field search for substellar members in NGC 2264
• The Potential of Detecting Radio-flaring Ultracool Dwarfs at L band in the FAST Drift-scan Survey
• CFBDS J111807-064016: A new L/T transition brown dwarf in a binary system
• Large Scale Searches for Brown Dwarfs and Free-Floating Planets
• Discovery of an L4$\beta$ Candidate Member of Argus in the Planetary Mass Regime: WISE J231921.92+764544.4
• Short-term spectroscopic monitoring of two cool dwarfs with strong magnetic fields
• Nature of Faint Companions to G type Stars using Adaptive Optics
• Accurate estimations of circumstellar and interstellar lines of quadruply ionized vanadium using the coupled cluster approach
• Metal-Depleted Brown Dwarfs
• Effect of Dust Size on the Near-Infrared Spectra (1.0-5.0 $\mu$m) of Brown Dwarf Atmospheres
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs
• The Brown Dwarf Kinematics Project (BDKP). II. Details on Nine Wide Common Proper Motion Very Low-Mass Companions to Nearby Stars
• Using Old and New Approaches: Determining Physical Properties of Brown Dwarfs with Empirical Relations and Machine Learning Models
• Spectral Classification; Old and Contemporary
• Disentangling the Signatures of Blended-Light Atmospheres in L/T Transition Brown Dwarfs
• Silicate Clouds, SiO, and Molecular Trends across the L-T Sequence: A JWST/MIRI LRS Spectral Library of Brown Dwarfs
• New constraints on the minimum mass for thermonuclear lithium burning in brown dwarfs
• Two close binaries across the hydrogen-burning limit in the Praesepe open cluster
• Activity and Kinematics of M and L Dwarfs
• SpeX Spectroscopy of Unresolved Very Low-Mass Binaries. I. Identification of Seventeen Candidate Binaries Straddling the L Dwarf/T Dwarf Transition
• Optical and Near-Infrared Spectroscopy of the L Subdwarf SDSS J125637.13-022452.4