A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B

Abstract

Young giant planets and brown dwarf companions emit near-infrared radiation that can be linearly polarized up to several percent. This polarization can reveal the presence of a circumsubstellar accretion disk, rotation-induced oblateness of the atmosphere, or an inhomogeneous distribution of atmospheric dust clouds. We measured the near-infrared linear polarization of 20 known directly imaged exoplanets and brown dwarf companions with the high-contrast imager SPHERE-IRDIS at the VLT. We reduced the data using the IRDAP pipeline to correct for the instrumental polarization and crosstalk with an absolute polarimetric accuracy <0.1% in the degree of polarization. We report the first detection of polarization originating from substellar companions, with a polarization of several tenths of a percent for DH Tau B and GSC 6214-210 B in H-band. By comparing the measured polarization with that of nearby stars, we find that the polarization is unlikely to be caused by interstellar dust. Because the companions have previously measured hydrogen emission lines and red colors, the polarization most likely originates from circumsubstellar disks. Through radiative transfer modeling, we constrain the position angles of the disks and find that the disks must have high inclinations. The presence of these disks as well as the misalignment of the disk of DH Tau B with the disk around its primary star suggest in situ formation of the companions. For the 18 other companions, we do not detect significant polarization and place subpercent upper limits on their degree of polarization. These non-detections may indicate the absence of circumsubstellar disks, a slow rotation rate of young companions, the upper atmospheres containing primarily submicron-sized dust grains, and/or limited cloud inhomogeneity. Finally, we present images of the circumstellar disks of DH Tau, GQ Lup, PDS 70, Beta Pic, and HD 106906.

arXiv commentAccepted for publication in A&A. Shortened abstract. 29 pages, 22 figures

References in corpus (136)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Protoplanetary Disks and Their Evolution
• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• A giant planet imaged in the disk of the young star Beta Pictoris
• Precipitating Condensation Clouds in Substellar Atmospheres
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• The Gemini Planet Imager: First Light
• Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70
• Models of Giant Planet formation with migration and disc evolution
• Defining and cataloging exoplanets: The exoplanet.eu database
• SPHERE: the exoplanet imager for the Very Large Telescope
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I
• 9286 Stars: An Agglomeration of Stellar Polarization Catalogs
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Two accreting protoplanets around the young star PDS 70
• Late-type stars members of young stellar kinematic groups - I. Single stars
• Stellar, Brown Dwarf, and Multiple Star Properties from Hydrodynamical Simulations of Star Cluster Formation
• The Disk Population of the Taurus Star-Forming Region
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
• Fundamental limitations of high contrast imaging set by small sample statistics
• Imaging Extrasolar Giant Planets
• The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
• PynPoint: An Image Processing Package for Finding Exoplanets
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
• Radiative transfer in very optically thick circumstellar disks
• Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk
• A companion to AB Pic at the planet/brown dwarf boundary
• A Triple Protostar System Formed via Fragmentation of a Gravitationally Unstable Disk
• The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE
• Submillimeter emission associated with candidate protoplanets
• The Gould's Belt Distances Survey (GOBELINS) I. Trigonometric parallax distances and depth of the Ophiuchus complex
• Polarimetric Imaging of Large Cavity Structures in the Pre-transitional Protoplanetary Disk around PDS 70: Observations of the disk
• Circumplanetary disc properties obtained from radiation hydrodynamical simulations of gas accretion by protoplanets
• A library of near-infrared integral field spectra of young M-L dwarfs
• Hipparcos distances of Ophiuchus and Lupus cloud complexes
• First direct detection of an exoplanet by optical interferometry; Astrometry and K-band spectroscopy of HR8799 e
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• Multiwavelength optical properties of compact dust aggregates in protoplanetary disks
• Flybys in protoplanetary discs: I. Gas and dust dynamics
• Three Wide Planetary-Mass Companions to FW Tau, ROXs 12, and ROXs 42B
• Dynamical Constraints on the HR 8799 Planets with GPI
• 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
• Tidal Truncation of Circumplanetary Discs
• Formation, Survival, and Detectability of Planets Beyond 100 AU
• The Gould's Belt Distances Survey (GOBELINS). IV. Distance, Depth and Kinematics of the Taurus Star-Forming Region
• $\beta$ Pictoris' inner disk in polarized light and new orbital parameters for $\beta$ Pictoris b
• The polarimetric imaging mode of VLT/SPHERE/IRDIS II: Characterization and correction of instrumental polarization effects
• The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
• Crossing the Brown Dwarf Desert Using Adaptive Optics: A Very Close L-Dwarf Companion to the Nearby Solar Analog HR 7672
• On the Distance to the Ophiuchus Star-Forming Region
• Spectroscopic rotational velocities of brown dwarfs
• Dynamical traceback age of the $\beta$ Pictoris moving group
• The polarimetric imaging mode of VLT/SPHERE/IRDIS I: Description, data reduction and observing strategy
• Accretion onto Planetary Mass Companions of Low-Mass Young Stars
• A Disk Around the Planetary-Mass Companion GSC 06214-00210 b: Clues About the Formation of Gas Giants on Wide Orbits
• The Dynamical Mass and Three-Dimensional Orbit of HR7672B: A Benchmark Brown Dwarf with High Eccentricity
• 1 to 2.4 micron Near-IR spectrum of the Giant Planet $\beta$ Pictoris b obtained with the Gemini Planet Imager
• Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD206893
• Magnetometry of the classical T Tauri star GQ Lup: non-stationary dynamos & spin evolution of young Suns
• The slow spin of the young sub-stellar companion GQ Lupi b and its orbital configuration
• Brown dwarf disks with ALMA
• New Pre-main-Sequence Stars in the Upper Scorpius Subgroup of Sco-Cen
• A narrow, edge-on disk resolved around HD 106906 with SPHERE
• Evidence for a circumplanetary disk around protoplanet PDS 70 b
• Non-azimuthal linear polarization in protoplanetary disks
• VLT/SPHERE robust astrometry of the HR8799 planets at milliarcsecond-level accuracy Orbital architecture analysis with PyAstrOFit
• Flybys in protoplanetary discs: II. Observational signatures
• Probing the Physical Properties of Directly Imaged Gas Giant Exoplanets Through Polarization
• How Spirals and Gaps Driven by Companions in Protoplanetary Disks Appear in Scattered Light at Arbitrary Viewing Angles
• Characterizing exoplanetary atmospheres through infrared polarimetry
• A Model-Independent Mass and Moderate Eccentricity for $\beta$ Pic b
• In-depth study of moderately young but extremely red, very dusty substellar companion HD206893B
• Optical Linear Polarization of Late M- and L-Type Dwarfs
• Dust masses of disks around 8 Brown Dwarfs and Very Low-Mass Stars in Upper Sco OB1 and Ophiuchus
• PynPoint: a modular pipeline architecture for processing and analysis of high-contrast imaging data
• Rotational studies in the Orion Nebula Cluster: from solar mass stars to brown dwarfs
• Obliquity Constraints on an Extrasolar Planetary-Mass Companion
• The TRENDS High-Contrast Imaging Survey. V. Discovery of an Old and Cold Benchmark T-dwarf Orbiting the Nearby G-star HD 19467
• Circumplanetary disks around young giant planets: a comparison between core-accretion and disk instability
• An ALMA Disk Mass for the Candidate Protoplanetary Companion to FW Tau
• The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member
• The Distances to Molecular Clouds at High Galactic Latitudes based on GAIA DR2
• ALMA Measurements of Circumstellar Material in the GQ Lup System
• Optical Linear Polarimetry of Ultra Cool Dwarfs
• Near-infrared integral-field spectra of the planet/brown dwarf companion AB Pic b
• The Evolution of Circumplanetary Disks around Planets in Wide Orbits: Implications for Formation Theory, Observations, and Moon Systems
• Exploring the Role of Sub-micron Sized Dust Grains in the Atmospheres of Red L0 - L6 Dwarfs
• Observed Polarization of Brown Dwarfs Suggests Low Surface Gravity
• Near-IR integral-field spectroscopy of the companion to GQ Lup
• Polarized scattered light from self-luminous exoplanets. Three-dimensional scattering radiative transfer with ARTES
• Probing Dust in the Atmosphere of Brown Dwarfs Through Polarization
• An ALMA and MagAO Study of the Substellar Companion GQ Lup B
• A universal spin-mass relation for brown dwarfs and planets
• Constraints on the disk geometry of the T Tauri star AA Tau from linear polarimetry
• A Thermal Infrared Imaging Study of Very Low-Mass, Wide Separation Brown Dwarf Companions to Upper Scorpius Stars: Constraining Circumstellar Environments
• First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lup
• First direct detection of a polarized companion outside of a resolved circumbinary disk around CS Cha
• High Precision Dynamical Masses of Pre-Main Sequence Stars with ALMA and Gaia
• Rotation Periods of Young Brown Dwarfs: K2 Survey in Upper Scorpius
• An ALMA Constraint on the GSC 6214-210 B Circum-Substellar Accretion Disk Mass
• Point Source Polarimetry with the Gemini Planet Imager: Sensitivity Characterization with T5.5 Dwarf Companion HD 19467 B
• First millimeter detection of the disk around a young, isolated, planetary-mass object
• Near-infrared Linear Polarization of Ultracool Dwarfs
• WIRC+Pol: a low-resolution near-infrared spectropolarimeter
• Multiple Scattering Polarization of Substellar-mass Objects : T-dwarfs
• Linear polarization of rapidly rotating ultracool dwarfs
• ALMA Observations of the Young Substellar Binary System 2M1207
• Direct Spectrum of the Benchmark T dwarf HD 19467 B
• GPI Spectroscopy of the Mass, Age, and Metallicity Benchmark Brown Dwarf HD 4747 B
• An Explanation of the Very Low Radio Flux of Young Planet-mass Companions
• Near-IR coronagraphic imaging of the companion to HR 7672
• Upper limits on protolunar disc masses using ALMA observations of directly-imaged exoplanets
• ALMA 0.88 mm Survey of Disks around Planetary-mass Companions
• An upper limit on the mass of the circumplanetary disk for DH Tau b
• Detecting Exomoons Around Self-luminous Giant Exoplanets Through Polarization
• A Rotation Rate for the Planetary-Mass Companion DH Tau b
• Optical linear polarization in ultra cool dwarfs: A tool to probe dust in the ultra cool dwarf atmospheres
• Optical and near-infrared linear polarization of low and intermediate-gravity ultra-cool dwarfs
• An ALMA Dynamical Mass Estimate of the Proposed Planetary-mass Companion FW Tau C
• Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets
• Benchmarking Substellar Evolutionary Models Using New Age Estimates for HD 4747 B and HD 19467 B
• High signal-to-noise spectral characterization of the planetary-mass object HD 106906 b
• CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
• Observations of solar scattering polarization at high spatial resolution

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