The $\text{Gaia}$ Ultra-Cool Dwarf Sample $-$ III: Seven new multiple systems containing at least one $\text{Gaia}$ DR2 ultra-cool dwarf

Abstract

We present ten new ultra-cool dwarfs in seven wide binary systems discovered using $\text{Gaia}$ DR2 data, identified as part of our $\text{Gaia}$ Ultra-Cool Dwarf Sample project. The seven systems presented here include an L1 companion to the G5 IV star HD 164507, an L1: companion to the V478 Lyr AB system, an L2 companion to the metal-poor K5 V star CD-28 8692, an M9 V companion to the young variable K0 V star LT UMa, and three low-mass binaries consisting of late Ms and early Ls. The HD 164507, CD-28 8692, V478 Lyr, and LT UMa systems are particularly important benchmarks, because the primaries are well characterised and offer excellent constraints on the atmospheric parameters and ages of the companions. We find that the M8 V star 2MASS J23253550+4608163 is $\sim$2.5 mag overluminous compared to M dwarfs of similar spectral type, but at the same time it does not exhibit obvious peculiarities in its near-infrared spectrum. Its overluminosity cannot be explained by unresolved binarity alone. Finally, we present an L1+L2 system with a projected physical separation of 959 au, making this the widest L+L binary currently known.

arXiv commentAccepted for publication on MNRAS

References in corpus (82)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The Transiting Exoplanet Survey Satellite
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Gaia Data Release 2: The astrometric solution
• The Dartmouth Stellar Evolution Database
• The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs
• A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• Models of Stars, Brown Dwarfs and Exoplanets
• Spectral Irradiance Calibration in the Infrared. XIV: the Absolute Calibration of 2MASS
• Gaia Data Release 2: Photometric content and validation
• An absolutely calibrated effective temperature scale from the InfraRed Flux Method
• The Pan-STARRS1 Surveys
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program.Galactic stellar populations and planets
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Basic physical parameters of a selected sample of evolved stars
• A Unified Near Infrared Spectral Classification Scheme for T Dwarfs
• Gaia Data Release 2: first stellar parameters from Apsis
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• 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
• Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• Atmospheric Parameters of Field L and T Dwarfs
• The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra
• Discoveries from a Near-infrared Proper Motion Survey using Multi-epoch 2MASS Data
• Population Properties of Brown Dwarf Analogs to Exoplanets
• Infrared Spectroscopy of Substellar Objects in Orion
• YREC: The Yale Rotating Stellar Evolution Code
• Low-Mass Tertiary Companions to Spectroscopic Binaries I: Common Proper Motion Survey for Wide Companions using 2MASS
• Characterizing Young Brown Dwarfs using Low Resolution Near-IR Spectra
• The Spectroscopically Determined Substellar Mass Function of the Orion Nebula Cluster
• The formation of very wide binaries during the star cluster dissolution phase
• Empirical, Accurate Masses and Radii of Single Stars with TESS and Gaia
• Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs I: Characterizing Benchmarks, Gl570D and HD3651B
• Chromospheric activity as age indicator
• Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich?
• VIRAC: The VVV Infrared Astrometric Catalogue
• Comoving stars in Gaia DR1: An abundance of very wide separation co-moving pairs
• Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
• Gaia Data Release 2: Processing the spectroscopic data
• Li abundances in F stars: planets, rotation and galactic evolution
• Clouds, Gravity and Metallicity in Blue L dwarfs: The Case of 2MASS J11263991-5003550
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• Retrieval of atmospheric properties of cloudy L dwarfs
• Stellar parameters and chemical abundances of 223 evolved stars with and without planets
• SpeX Spectroscopy of Unresolved Very Low Mass Binaries. II. Identification of Fourteen Candidate Binaries with Late-M/Early-L and T Dwarf Components
• Sloan Low-Mass Wide Pairs of Kinematically Equivalent Stars (SLoWPoKES): A Catalog of Very Wide, Low-mass Pairs
• The CatWISE Preliminary Catalog: Motions from $WISE$ and $NEOWISE$ Data
• Atmospheres from very low-mass stars to extrasolar planets
• Seventy six T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density
• On the properties of young multiple stars
• Finding benchmark brown dwarfs to probe the IMF as a function of time
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• The catalogue of radial velocity standard stars for Gaia I. Pre-launch release
• The metallicity signature of evolved stars with planets
• The Decay of Accreting Triple Systems as Brown Dwarf Formation Scenario
• The extremely red L dwarf ULAS J222711$-$004547 - dominated by dust
• Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations
• Surface Gravities for 228 M, L, and T Dwarfs in the NIRSPEC Brown Dwarf Spectroscopic Survey
• The Gaia Ultracool Dwarf Sample. I. Known L and T dwarfs and the first Gaia data release
• The Gaia Ultra-Cool Dwarf Sample -- II: Structure at the end of the main sequence
• Reaching the boundary between stellar kinematic groups and very wide binaries. III. Sixteen new stars and eight new wide systems in the beta Pictoris moving group
• Empirical Bolometric Fluxes and Angular Diameters of 1.6 Million Tycho-2 Stars and Radii of 350,000 Stars with \emph{Gaia} DR1 Parallaxes
• Primeval very low-mass stars and brown dwarfs - II. The most metal-poor substellar object
• The Penn State - Toruń Centre for Astronomy Planet Search stars IV. Dwarfs and the complete sample
• Characterization of the Very Low Mass Secondary in the GJ 660.1AB System
• A 1500 deg${}^2$ Near Infrared Proper Motion Catalogue from the UKIDSS Large Area Survey
• Discovery of a brown dwarf companion to the A3V star β Circini
• Discovery And Characterization of Wide Binary Systems With a Very Low Mass Component
• Resolved Spectroscopy of M Dwarf/L Dwarf Binaries. III. The "Wide" L3.5/L4 Dwarf Binary 2MASS J15500845+1455180AB
• Ultracool dwarf benchmarks with \emph{Gaia} primaries
• Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
• Masses and luminosities for 342 stars from the PennState-Toruń Centre for Astronomy Planet Search
• FUNDPAR: A Program for deriving Fundamental Parameters from Equivalent Widths

Cited by in corpus (5)

• Multiplicity of stars with planets in the solar neighbourhood
• CWISE J014611.20-050850.0AB: The Widest Known Brown Dwarf Binary in the Field
• Increasing the census of L and T dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs
• Ross 19B: An Extremely Cold Companion Discovered via the Backyard Worlds: Planet 9 Citizen Science Project