Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B

Abstract

Dynamical masses of giant planets and brown dwarfs are critical tools for empirically validating substellar evolutionary models and their underlying assumptions. We present a measurement of the dynamical mass and an updated orbit of PZ Tel B, a young brown dwarf companion orbiting a late-G member of the $\beta$ Pic moving group. PZ Tel A exhibits an astrometric acceleration between Hipparcos and Gaia EDR3, which enables the direct determination of the companion's mass. We have also acquired new Keck/NIRC2 adaptive optics imaging of the system, which increases the total baseline of relative astrometry to 15 years. Our joint orbit fit yields a dynamical mass of $27_{-9}^{+25}{M}_{\mathrm{Jup}}$, semi-major axis of $27_{-4}^{+14}\mathrm{au}$, eccentricity of $0.52_{-0.10}^{+0.08}$, and inclination of $91.73_{-0.32}^{+0.36}{}^{\circ }$. The companion's mass is consistent within $1.1\sigma$ of predictions from four grids of hot-start evolutionary models. The joint orbit fit also indicates a more modest eccentricity of PZ Tel B than previous results. PZ Tel joins a small number of young ($<200\mathrm{Myr}$) systems with benchmark substellar companions that have dynamical masses and precise ages from moving group membership.

arXiv comment14 pages, 5 figures, accepted to AJ

References in corpus (88)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Gaia Data Release 3: Summary of the content and survey properties
• Cosmic-Ray Rejection by Laplacian Edge Detection
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• Models of Stars, Brown Dwarfs and Exoplanets
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• First Light for GRAVITY: Phase Referencing Optical Interferometry for the Very Large Telescope Interferometer
• SPHERE: the exoplanet imager for the Very Large Telescope
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• The Subaru Coronagraphic Extreme Adaptive Optics system: enabling high-contrast imaging on solar-system scales
• A new set of atmosphere and evolution models for cool T-Y brown dwarfs and giant exoplanets
• The Deuterium-Burning Mass Limit for Brown Dwarfs and Giant Planets
• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• A catalogue of young runaway Hipparcos stars within 3kpc from the Sun
• The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks
• CLES, Code Liegeois d'Evolution Stellaire
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• A planet within the debris disk around the pre-main-sequence star AU Microscopii
• The Extremely Red, Young L Dwarf PSO J318-22: A Free-Floating Planetary-Mass Analog to Directly Imaged Young Gas-Giant Planets
• The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE
• The Palomar/Keck Adaptive Optics Survey of Young Solar Analogs: Evidence for a Universal Companion Mass Function
• Gaia Early Data Release 3: Summary of the contents and survey properties
• VIP: Vortex Image Processing package for high-contrast direct imaging
• The Age of Beta Pic
• Individual Dynamical Masses of Ultracool Dwarfs
• Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
• A public HARPS radial velocity database corrected for systematic errors
• A Statistical Analysis of SEEDS and Other High-Contrast Exoplanet Surveys: Massive Planets or Low-Mass Brown Dwarfs?
• The Gemini NICI Planet-Finding Campaign: Discovery of a Close Substellar Companion to the Young Debris Disk Star PZ Tel
• Precise Dynamical Masses of Directly Imaged Companions from Relative Astrometry, Radial Velocities, and Hipparcos-Gaia DR2 Accelerations
• HST/NICMOS detection of HR 8799 b in 1998
• MIRACLES: atmospheric characterization of directly imaged planets and substellar companions at 4-5 $\mu$m. I. Photometric analysis of $\beta$ Pic b, HIP 65426 b, PZ Tel B and HD 206893 B
• 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
• Direct confirmation of the radial-velocity planet $\beta$ Pic c
• Atmospheres from very low-mass stars to extrasolar planets
• Empirical Isochrones for Low Mass Stars in Nearby Young Associations
• orvara: An Efficient Code to Fit Orbits using Radial Velocity, Absolute, and/or Relative Astrometry
• Dynamical traceback age of the $\beta$ Pictoris moving group
• 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
• All-sky Co-moving Recovery Of Nearby Young Members. (ACRONYM) II: The Beta Pictoris Moving Group
• Epsilon Indi Ba, Bb: a detailed study of the nearest known brown dwarfs
• Astrometric Monitoring of the HR 8799 Planets: Orbit Constraints from Self-Consistent Measurements
• Detection and Bulk Properties of the HR 8799 Planets with High Resolution Spectroscopy
• Direct discovery of the inner exoplanet in the HD206893 system. Evidence for deuterium burning in a planetary-mass companion
• AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data
• Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis
• Direct Imaging and Astrometric Detection of a Gas Giant Planet Orbiting an Accelerating Star
• Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
• In-depth study of moderately young but extremely red, very dusty substellar companion HD206893B
• The SPHERE infrared survey for exoplanets (SHINE) -- II. Observations, Data reduction and analysis Detection performances and early-results
• A Model-Independent Mass and Moderate Eccentricity for $\beta$ Pic b
• Precise Dynamical Masses and Orbital Fits for $\beta$ Pic b and $\beta$ Pic c
• Direct Imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS
• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• Deuterium burning in objects forming via the core accretion scenario - Brown dwarfs or planets?
• Direct imaging of an ultracool substellar companion to the exoplanet host star HD 4113A
• A Dynamical Mass of $70\pm 5$ Jupiter Masses for Gliese 229B, the First T Dwarf
• Orbit and Dynamical Mass of the Late-T Dwarf Gl 758 B
• 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
• Unveiling new members in five nearby young moving groups
• The First Dynamical Mass Measurement in the HR 8799 System
• A detailed characterization of HR 8799's debris disk with ALMA in Band 7
• Search for associations containing young stars (SACY) VIII. An updated census of spectroscopic binary systems showing hints of non-universal multiplicity among these associations
• Direct detection of a substellar companion to the young nearby star PZ Telescopii
• 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
• Astrometric Accelerations as Dynamical Beacons: Discovery and Characterization of HIP 21152 B, the First T-Dwarf Companion in the Hyades
• Planets Around Low-Mass Stars (PALMS). V. Age-Dating Low-Mass Companions to Members and Interlopers of Young Moving Groups
• Spin-orbit alignment of the $\beta$ Pictoris planetary system
• Precise Dynamical Masses of Epsilon Indi Ba and Bb: Evidence of Slowed Cooling at the L/T Transition
• Integral Field Spectroscopy of the Low-Mass Companion HD984B with the Gemini Planet Imager
• Benchmark cool companions: Ages and abundances for the PZ Tel system
• Discovery of an Edge-on Circumstellar Debris Disk Around BD+45${}^{\circ }$598: a Newly Identifed Member of the $\beta$ Pictoris Moving Group
• First spectroscopic observations of the sub-stellar companion of the young debris disk star PZ Telescopii
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• AST: A library for modelling and manipulating coordinate systems
• Detection of H$\alpha$ emission from PZ Tel B using SPHERE/ZIMPOL
• Development of models for nearby young stellar moving groups: creation, revision, and finalisation of the models
• 2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the $\beta$ Pictoris Moving Group

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• The ESO SupJup Survey I: Chemical and isotopic characterisation of the late L-dwarf DENIS J0255-4700 with CRIRES${}^{+}$
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• Atmospheric abundances and bulk properties of the binary brown dwarf Gliese 229 Bab from JWST/MIRI spectroscopy
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