Scattered Light from Dust in the Cavity of the V4046 Sgr Transition Disk

Abstract

We report the presence of scattered light from dust grains located in the giant planet formation region of the circumbinary disk orbiting the ~20-Myr-old close (~0.045 AU separation) binary system V4046 Sgr AB based on observations with the new Gemini Planet Imager (GPI) instrument. These GPI images probe to within ~7 AU of the central binary with linear spatial resolution of ~3 AU, and are thereby capable of revealing dust disk structure within a region corresponding to the giant planets in our solar system. The GPI imaging reveals a relatively narrow (FWHM ~10 AU) ring of polarized near-infrared flux whose brightness peaks at ~14 AU. This ~14 AU radius ring is surrounded by a fainter outer halo of scattered light extending to ~45 AU, which coincides with previously detected mm-wave thermal dust emission. The presence of small grains that efficiently scatter starlight well inside the mm-wavelength disk cavity supports current models of planet formation that suggest planet-disk interactions can generate pressure traps that impose strong radial variations in the particle size distribution throughout the disk.

13 pages, 4 figures, Accepted to ApJ Letters

References in corpus (18)

• The Gemini Planet Imager: First Light
• Protoplanetary Disk Structures in Ophiuchus
• Ring shaped dust accumulation in transition disks
• On the age of the $\beta$ Pictoris moving group
• Dust filtration at gap edges: Implications for the spectral energy distributions of discs with embedded planets
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• An Inner Hole in the Disk around TW Hydrae Resolved in 7 Millimeter Dust Emission
• HD100546 Multi-Epoch Scattered-Light Observations
• X-ray accretion signatures in the close CTTS binary V4046 Sgr
• Gemini Planet Imager Observational Calibrations I: Overview of the GPI Data Reduction Pipeline
• Shadows and cavities in protoplanetary disks: HD163296, HD141569A, and HD150193A in polarized light
• Unbiased mm-wave Line Surveys of TW Hya and V4046 Sgr: The Enhanced C2H and CN Abundances of Evolved Protoplanetary Disks
• Molecules in the disk orbiting the twin young suns of V4046 Sgr
• Accreting planets as dust dams in `transition' discs
• The evolution of accretion in young stellar objects: Strong accretors at 3 - 10 Myr
• Surface Geometry of Protoplanetary Disks Inferred From Near-Infrared Imaging Polarimetry
• Planet-induced disk structures: A comparison between (sub)mm and infrared radiation

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• Disks Around T Tauri Stars with SPHERE (DARTTS-S) II: Twenty-one new polarimetric images of young stellar disks
• The widest H$\alpha$ survey of accreting protoplanets around nearby transition disks
• The Frequency Of Binary Star Interlopers Amongst Transitional Discs
• Characterizing the morphology of the debris disk around the low-mass star GSC~07396-00759
• Two cold belts in the debris disk around the G-type star NZ Lup
• Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk