Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B

Abstract

Context. Detecting and characterizing substellar companions for which the luminosity, mass, and age can be determined independently is of utter importance to test and calibrate the evolutionary models due to uncertainties in their formation mechanisms. HD 19467 is a bright and nearby star hosting a cool brown dwarf companion detected with RV and imaging, making it a valuable object for such studies. Aims. We aim to further characterize the orbital, spectral, and physical properties of the HD 19467 system. Methods. We present new high-contrast imaging data with the SPHERE and NaCo instruments. We also analyze archival data from HARPS, NaCo, HIRES, UVES, and ASAS. We also use proper motion data of the star from Hipparcos and Gaia. Results. We refine the properties of the host star and derive an age of 8.0${}_{-1.0}^{+2.0}$ Gyr based on isochrones, gyrochronology, and chemical and kinematic arguments. This estimate is slightly younger than previous estimates of ~9-11 Gyr. No orbital curvature is seen in the current imaging, RV, and astrometric data. From a joint fit of the data, we refine the orbital parameters for HD 19467B: period 398${}_{-93}^{+95}$ yr, inclination 129.8${}_{-5.1}^{+8.1}$ deg, eccentricity 0.56$\pm$0.09, longitude of the ascending node 134.8$\pm$4.5 deg, and argument of the periastron 64.2${}_{-6.3}^{+5.5}$ deg. We assess a dynamical mass of 74${}_{-9}^{+12}$ MJ. The fit with atmospheric models of the spectrophotometric data of HD 19467B indicates an atmosphere without clouds or with very thin clouds, an effective temperature of 1042${}_{-71}^{+77}$ K, and a large surface gravity of 5.34${}_{-0.09}^{+0.08}$ dex. The comparison to model predictions of the bolometric luminosity and dynamical mass of HD 19467B, assuming our system age estimate, indicates a better agreement with the Burrows et al. models; whereas the other evolutionary models used tend to underestimate its cooling rate.

Accepted for publication in A&A, 25 pages, 23 figures, 9 tables. Abstract slightly abridged to match arXiv requirements. Updated after language editing

References in corpus (41)

• The Gaia mission
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
• EXOFAST: A fast exoplanetary fitting suite in IDL
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• On the Luminosity of Young Jupiters
• Basic physical parameters of a selected sample of evolved stars
• Fundamental limitations of high contrast imaging set by small sample statistics
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• Observing transiting planets with JWST -- Prime targets and their synthetic spectral observations
• Discovery of a warm, dusty giant planet around HIP65426
• Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• Performance of the VLT Planet Finder SPHERE II. Data analysis and Results for IFS in laboratory
• CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition?
• A very cool brown dwarf in UKIDSS DR1
• Characterizing 51 Eri b from 1-5 $\mu$m: a partly-cloudy exoplanet
• Exploring the substellar temperature regime down to ~550K
• Hubble Space Telescope Spectroscopy of Brown Dwarfs Discovered with the Wide-field Infrared Survey Explorer
• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
• High-precision abundances of Sc, Mn, Cu, and Ba in solar twins. Trends of element ratios with stellar age
• Design, analysis and test of a microdots apodizer for the Apodized Pupil Lyot Coronagraph
• Toward the analysis of JWST exoplanet spectra: Identifying troublesome model parameters
• The Luminosities of the Coldest Brown Dwarfs
• The Impact of Metallicity on the Evolution of Rotation and Magnetic Activity of Sun-Like Stars
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• In-depth study of moderately young but extremely red, very dusty substellar companion HD206893B
• The LEECH Exoplanet Imaging Survey. Further constraints on the planet architecture of the HR 8799 system
• Trigonometric parallaxes of young field L dwarfs
• A critical reassessment of the fundamental properties of GJ 504: Chemical composition and age
• Characterization of Low-mass, Wide-separation Substellar Companions to Stars in Upper Scorpius: Near-infrared Photometry and Spectroscopy
• Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
• Hint of curvature in the orbital motion of the exoplanet 51 Eridani b using 3 years of VLT/SPHERE monitoring
• The Young Substellar Companion ROXs 12 B: Near-Infrared Spectrum, System Architecture, and Spin-Orbit Misalignment
• The VAST Survey - IV. A wide brown dwarf companion to the A3V star $\zeta$ Delphini
• The very nearby M/T dwarf binary SCR 1845-6357
• Direct Spectrum of the Benchmark T dwarf HD 19467 B
• A dusty benchmark brown dwarf near the ice line of HD 72946
• Characterising brown dwarf companions with IRDIS long-slit spectroscopy: HD 1160 B and HD 19467 B
• Benchmarking Substellar Evolutionary Models Using New Age Estimates for HD 4747 B and HD 19467 B

Cited by in corpus (17)

• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• Retrieving the C and O Abundances of HR 7672~AB: a Solar-Type Primary Star with a Benchmark Brown Dwarf
• True masses of the long-period companions to HD 92987 and HD 221420 from Hipparcos-Gaia astrometry
• Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-Dwarf Companion in the Hyades
• The Orbital Eccentricities of Directly Imaged Companions Using Observable-Based Priors: Implications for Population-level Distributions
• The McDonald Accelerating Stars Survey (MASS): White Dwarf Companions Accelerating the Sun-like Stars 12 Psc and HD 159062
• The McDonald Accelerating Stars Survey (MASS): Discovery of a Long-Period Substellar Companion Orbiting the Old Solar Analog HD 47127
• First Observations of the Brown Dwarf HD 19467 B with JWST
• Precise dynamical masses of new directly imaged companions from combining relative astrometry, radial velocities, and Hipparcos-Gaia eDR3 accelerations
• Detectability of satellites around directly imaged exoplanets and brown dwarfs
• Following the Lithium: Tracing Li-bearing Molecules Across Age, Mass, and Gravity in Brown Dwarfs
• Discovery of a resolved white dwarf-brown dwarf binary with a small projected separation: SDSS J222551.65+001637.7AB
• High-contrast, high-angular resolution view of the GJ 367 exoplanet system
• htof: A new open-source tool for analyzing Hipparcos, Gaia, and future astrometric missions
• JWST high-contrast spectroscopy with speckle modelling: Atmospheric retrievals of the T dwarf companion HD 19467 B