Discovery of a resolved white dwarf-brown dwarf binary with a small projected separation: SDSS J222551.65+001637.7AB

Abstract

We present the confirmation of SDSS J222551.65+001637.7AB as a closely separated, resolved, white dwarf-brown dwarf binary. We have obtained spectroscopy from GNIRS and seeing-limited $K_s$-band imaging from NIRI on Gemini North. The target is spatially resolved into its constituent components: a 10926$\pm$ 246 K white dwarf, with log $g=8.214\pm 0.168$ and a mass of 0.66${}_{-0.06}^{+0.11}$ M${}_{\odot }$, and an L4 brown dwarf companion, which are separated by $0.9498\pm 0.0022$". We derive the fundamental properties of the companion from the Sonora-Bobcat evolutionary models, finding a mass of $25-53$ M${}_{\text{Jup}}$ and a radius of $0.101-0.128$ R${}_{\odot }$ for the brown dwarf, at a confidence level of 1$\sigma$. We use wdwarfdate to determine the age of the binary as $1.97_{-0.76}^{+4.41}$ Gyr. A kinematic analysis shows that this binary is likely a member of the thick disc. The distance to the binary is 218${}_{-13}^{+14}$ pc, and hence the projected separation of the binary is 207${}_{-12}^{+13}$ AU. Whilst the white dwarf progenitor was on the main sequence the binary separation would have been $69\pm 5$ AU. SDSS J222551.65+001637.7AB is the third closest spatially resolved white dwarf-brown dwarf binary after GD 165AB and PHL 5038AB.

arXiv comment9 pages, 6 figures. Accepted for publication in MNRAS

References in corpus (66)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• Exploring the Milky Way stellar disk. A detailed elemental abundance study of 714 F and G dwarf stars in the Solar neighbourhood
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• How to Constrain Your M dwarf II: the mass-luminosity-metallicity relation from 0.075 to 0.70$M_{\odot }$
• A catalogue of white dwarfs in Gaia EDR3
• The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M${}_{\odot }$
• On the Spectral Evolution of Hot White Dwarf Stars. I. A Detailed Model-Atmosphere Analysis of Hot White Dwarfs from SDSS DR12
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• Fingering convection and cloudless models for cool brown dwarf atmospheres
• Low Luminosity Companions to White Dwarfs
• Individual Dynamical Masses of Ultracool Dwarfs
• Water Clouds in Y Dwarfs and Exoplanets
• Discovery of a Candidate for the Coolest Known Brown Dwarf
• Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
• Survival of a brown dwarf after engulfment by a red giant star
• 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
• Statistical Properties of Brown Dwarf Companions: Implications for Different Formation Mechanisms
• Precise Dynamical Masses of Directly Imaged Companions from Relative Astrometry, Radial Velocities, and Hipparcos-Gaia DR2 Accelerations
• The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
• DA white dwarfs in SDSS DR7 and a search for infrared excess emission
• A White Dwarf catalogue from Gaia-DR2 and the Virtual Observatory
• The WIRED Survey II: Infrared Excesses in the SDSS DR7 White Dwarf Catalog
• (Sub)stellar companions shape the winds of evolved stars
• The chemical diversity of exo-terrestrial planetary debris around white dwarfs
• First light of the VLT planet finder SPHERE. I. Detection and characterization of the sub-stellar companion GJ 758 B
• Finding benchmark brown dwarfs to probe the IMF as a function of time
• Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• White dwarfs in the UKIDSS Large Area Survey: The Substellar Companion Fraction
• Imaging planets around nearby white dwarfs
• Measuring M dwarf Winds with DAZ White Dwarfs
• Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
• Spitzer Follow-up of Extremely Cold Brown Dwarfs Discovered by the Backyard Worlds: Planet 9 Citizen Science Project
• Discovery of a T dwarf + white dwarf binary system
• SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
• Infrared-excess white dwarfs in the Gaia 100 pc sample
• WISE/2MASS-SDSS brown dwarfs candidates using Virtual Observatory tools
• The first sub-70 minute non-interacting WD-BD system: EPIC212235321
• 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
• The Ultra Cool Brown Dwarf Companion of WD 0806-661: Age, Mass, and Formation Mechanism
• An Eclipsing Substellar Binary in a Young Triple System discovered by SPECULOOS
• PHL 5038: A spatially resolved white dwarf + brown dwarf binary
• The Gaia DR2 halo white dwarf population: the luminosity function, mass distribution and its star formation history
• Analytic Models of Brown Dwarfs and The Substellar Mass Limit
• The kinematics of the white dwarf population from the SDSS DR12
• Kinematic properties of white dwarfs. Galactic orbital parameters and age-velocity dispersion relation
• wdwarfdate: A Python Package to Derive Bayesian Ages of White Dwarfs
• Point Source Polarimetry with the Gemini Planet Imager: Sensitivity Characterization with T5.5 Dwarf Companion HD 19467 B
• Direct Spectrum of the Benchmark T dwarf HD 19467 B
• Characterizing HR3549B using SPHERE
• Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B
• Discovery of a low-mass companion around HR3549
• Analysing the spectral energy distributions of Galactic classical Cepheids
• Exploring the stellar rotation of early-type stars in the LAMOST Medium-Resolution Survey. II. Statistics
• Confirming new white dwarf-ultracool dwarf binary candidates
• The Sonora Brown Dwarf Atmosphere and Evolution Models I. Model Description and Application to Cloudless Atmospheres in Rainout Chemical Equilibrium

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