Imaging the 44 AU Kuiper Belt-analogue debris ring around HD 141569A with GPI polarimetry

Abstract

We present the first polarimetric detection of the inner disk component around the pre-main sequence B9.5 star HD 141569A. Gemini Planet Imager H-band (1.65 micron) polarimetric differential imaging reveals the highest signal-to-noise ratio detection of this ring yet attained and traces structure inwards to 0.25" (28 AU at a distance of 111 pc). The radial polarized intensity image shows the east side of the disk, peaking in intensity at 0.40" (44 AU) and extending out to 0.9" (100 AU). There is a spiral arm-like enhancement to the south, reminiscent of the known spiral structures on the outer rings of the disk. The location of the spiral arm is coincident with 12CO J=3-2 emission detected by ALMA, and hints at a dynamically active inner circumstellar region. Our observations also show a portion of the middle dusty ring at ~220 AU known from previous observations of this system. We fit the polarized H-band emission with a continuum radiative transfer Mie model. Our best-fit model favors an optically thin disk with a minimum dust grain size close to the blow-out size for this system: evidence of on-going dust production in the inner reaches of the disk. The thermal emission from this model accounts for virtually all of the far-infrared and millimeter flux from the entire HD 141569A disk, in agreement with the lack of ALMA continuum and CO emission beyond ~100 AU. A remaining 8-30 micron thermal excess a factor of ~2 above our model argues for a yet-unresolved warm innermost 5-15 AU component of the disk.

arXiv comment16 pages, 8 figures, accepted at AJ

References in corpus (54)

• Gaia Data Release 2. Summary of the contents and survey properties
• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• A giant planet imaged in the disk of the young star Beta Pictoris
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• The Gemini Planet Imager: First Light
• Monte Carlo radiative transfer in protoplanetary disks
• How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
• Discovery of Small-Scale Spiral Structures in the Disk of SAO 206462 (HD 135344B): Implications for the Physical State of the Disk from Spiral Density Wave Theory
• Benchmark problems for continuum radiative transfer. High optical depths, anisotropic scattering, and polarisation
• Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• The Circumstellar Disk of HD 141569 Imaged with NICMOS
• Structures in the protoplanetary disk of HD142527 seen in polarized scattered light
• Observational Signatures of Planets in Protoplanetary Disks II: Spiral Arms Observed in Scattered Light Imaging Can be Induced by Planets
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• HST/ACS Coronagraphic Imaging of the Circumstellar Disk around HD1415659A
• Multiwavelength optical properties of compact dust aggregates in protoplanetary disks
• ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
• Formation of sharp eccentric rings in debris disks with gas but without planets
• Near-infrared scattered light properties of the HR4796A dust ring: a measured scattering phase function from 13.6deg to 166.6deg
• $\beta$ Pictoris' inner disk in polarized light and new orbital parameters for $\beta$ Pictoris b
• Mid-infrared spectra of PAH emission in Herbig AeBe stars
• Molecular gas in debris disks around young A-type stars
• Reconnaissance of the HR 8799 Exosolar System II: Astrometry and Orbital Motion
• Spiral Arms in Gravitationally Unstable Protoplanetary Disks as Imaged in Scattered Light
• Study of the properties and spectral energy distributions of the Herbig AeBe stars HD 34282 and HD 141569
• Discovery of a Two-Armed Spiral Structure in the Gapped Disk in HD 100453
• Stellar Companions and the Age of HD 141569 and its Circumstellar Disk
• An M Dwarf Companion and Its Induced Spiral Arms in the HD 100453 Protoplanetary Disk
• A Resolved Molecular Gas Disk around the Nearby A Star 49 Ceti
• Accretion-related properties of Herbig Ae/Be stars. Comparison with T Tauris
• Non-azimuthal linear polarization in protoplanetary disks
• Inner Rim of A Molecular Disk Spatially Resolved in Infrared CO Emission Lines
• How Bright are Planet-Induced Spiral Arms in Scattered Light?
• Astrometric Confirmation and Preliminary Orbital Parameters of the Young Exoplanet 51 Eridani b with the Gemini Planet Imager
• How Spirals and Gaps Driven by Companions in Protoplanetary Disks Appear in Scattered Light at Arbitrary Viewing Angles
• Modeling the Infrared Emission from the HD 141569A Disk
• Gemini Planet Imager Observational Calibrations I: Overview of the GPI Data Reduction Pipeline
• Modeling the gas-phase chemistry of the transitional disk around HD 141569A
• Gemini Planet Imager Observational Calibrations VIII: Characterization and Role of Satellite Spots
• Discovery of concentric broken rings at sub-arcsec separations in the HD 141569A gas-rich, debris disk with VLT/SPHERE
• Formation of Narrow Dust Rings in Circumstellar Debris Disks
• Gas lines from the 5-Myr old optically thin disk around HD141569A. Herschel observations and modeling
• Dust Distribution in Gas Disks II: Self Induced Ring Formation Through a Clumping Instability
• Characterization of the inner disk around HD 141569 A from Keck/NIRC2 L-band vortex coronagraphy
• Discovery of an Inner Disk Component around HD 141569 A
• Mid-InfraRed imaging of the circumstellar dust around three Herbig Ae stars : HD135344, CQTau, HD163296
• Resolved Gas Interior to the Dust Rings of the HD 141569 Disk
• The interplay between radiation pressure and the photoelectric instability in optically thin disks of gas and dust
• Gemini Planet Imager Observational Calibrations VI: Photometric and Spectroscopic Calibration for the Integral Field Spectrograph
• The Matryoshka Disk: Keck/NIRC2 Discovery of a Solar System-Scale, Radially Segregated Residual Protoplanetary Disk Around HD 141569A
• ALMA and VLA Observations of the HD 141569 System
• A symmetric inner cavity in the HD 141569A transitional disk

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• The JWST Early Release Science Program for the Direct Imaging & Spectroscopy of Exoplanetary Systems
• The Pulsation Properties of $\lambda$ Bootis Stars I. The Southern TESS Sample
• The Discovery of lambda Bootis Stars -- The Southern Survey II
• Revealing asymmetrical dust distribution in the inner regions of HD 141569
• Multiband polarimetric imaging of HD 34700 with SCExAO/CHARIS