The Structure of the Evolved Circumbinary Disk around V4046 Sgr

Abstract

We present sensitive, sub-arcsecond resolution Submillimeter Array observations of the protoplanetary disk around the nearby, pre-main sequence spectroscopic binary V4046 Sgr. We report for the first time a large inner hole (r=29 AU) spatially resolved in the 1.3 mm continuum emission and study the structure of this disk using radiative transfer calculations to model the spectral energy distribution (SED), continuum visibilities, and spectral line emission of CO and its main isotopologues. Our modeling scheme demonstrates that the majority of the dust mass is distributed in a narrow ring (centered at 37 AU with a FWHM of 16 AU) that is ~5 times more compact than the gas disk. This structure implies that the dust-to-gas mass ratio has a strong spatial variation, ranging from a value much larger than typical of the interstellar medium (ISM) at the ring to much smaller than that of the ISM at larger disk radii. We suggest that these basic structural features are potentially observational signatures of the accumulation of solids at a local gas pressure maximum. These models also require a substantial population of ~micron-sized grains inside the central disk cavity. We suggest that this structure is likely the result of dynamical interactions with a low-mass companion, although photoevaporation may also play a secondary role.

31 pages, 8 figures, accepted for publication in ApJ

References in corpus (20)

• Coagulation, fragmentation and radial motion of solid particles in protoplanetary disks
• Protoplanetary Disk Structures in Ophiuchus
• Gas- and dust evolution in protoplanetary disks
• A Major Asymmetric Dust Trap in a Transition Disk
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• Ring shaped dust accumulation in transition disks
• Observations of gas flows inside a protoplanetary gap
• Dust filtration at gap edges: Implications for the spectral energy distributions of discs with embedded planets
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• Structure and evolution of pre-main sequence circumstellar disks
• Photoevaporation of protoplanetary discs I: hydrodynamic models
• Dust dynamics during protoplanetary disc clearing
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• Can grain growth explain transition disks?
• Resolving the chemistry in the disk of TW Hydrae I. Deuterated species
• Subaru Imaging of Asymmetric Features in a Transitional Disk in Upper Scorpius
• X-ray accretion signatures in the close CTTS binary V4046 Sgr
• The dispersal of protoplanetary disks around binary stars
• Evidence for Accretion in the High-resolution X-ray Spectrum of the T Tauri Star System Hen 3-600
• Molecules in the disk orbiting the twin young suns of V4046 Sgr

Cited by in corpus (77)

• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• On the diversity and statistical properties of protostellar discs
• Dust Evolution and the Formation of Planetesimals
• Weak Turbulence in the HD 163296 Protoplanetary Disk Revealed by ALMA CO Observations
• Molecules with ALMA at Planet-forming Scales (MAPS) I: Program Overview and Highlights
• A Parametric Modeling Approach to Measuring the Gas Masses of Circumstellar Disks
• The cometary composition of a protoplanetary disk as revealed by complex cyanides
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• Dust depleted inner disks in a large sample of transition disks through long-baseline ALMA observations
• Measuring turbulent motion in planet-forming disks with ALMA: A detection around DM Tau and non-detections around MWC 480 and V4046 Sgr
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• A Survey of CH3CN and HC3N in Protoplanetary Disks
• Sulfur chemistry in protoplanetary disks: CS and H2CS
• Excess C/O and C/H in outer protoplanetary disk gas
• Misaligned Protoplanetary Disks in a Young Binary System
• Systematic Variations of CO Gas Abundance with Radius in Gas-rich Protoplanetary Disks
• Rings and gaps in the disc around Elias 24 revealed by ALMA
• A survey of C2H, HCN, and C18O in protoplanetary disks
• An ALMA survey of DCN/H${}^{13}$CN and DCO${}^{+}$/H${}^{13}$CO${}^{+}$ in protoplanetary disks
• Observations of Solids in Protoplanetary Disks
• Spiral Arms in Disks: Planets or Gravitational Instability?
• High gas/dust size ratio indicating efficient radial drift in the mm-faint CX Tau disk
• The (w)hole survey: an unbiased sample study of transition disk candidates based on Spitzer catalogs
• Electromagnetic signals following stellar-mass black hole mergers
• Comparison of the dust and gas radial structure in the transition disk [PZ99] J160421.7-213028
• Probing CO and N${}_2$ Snow Surfaces in Protoplanetary Disks with N${}_2$H${}^{+}$ Emission
• Long Term Evolution of Planet-Induced Vortices in Protoplanetary Disks
• The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines
• Peering into the Giant Planet Forming Region of the TW Hydrae Disk with the Gemini Planet Imager
• Evidence for a CO desorption front in the outer AS 209 disk
• Spatial segregation of dust grains in transition disks. SPHERE observations of 2MASS J16083070-3828268 and RXJ1852.3-3700
• A dust and gas cavity in the disc around CQ Tau revealed by ALMA
• Unbiased mm-wave Line Surveys of TW Hya and V4046 Sgr: The Enhanced C2H and CN Abundances of Evolved Protoplanetary Disks
• Using Ice and Dust Lines to Constrain the Surface Densities of Protoplanetary Disks
• A ring-like concentration of mm-sized particles in Sz 91
• H2CO distribution and formation in the TW Hya disk
• A Subarcsecond ALMA Molecular Line Imaging Survey of the Circumbinary, Protoplanetary Disk Orbiting V4046 Sgr
• The role of C/O in nitrile astrochemistry in PDRs and planet-forming disks
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• AB Aur, a Rosetta stone for studies of planet formation (I): chemical study of a planet-forming disk
• Multiple paths of deuterium fractionation in protoplanetary disks
• Scattered Light from Dust in the Cavity of the V4046 Sgr Transition Disk
• Herschel evidence for disk flattening or gas depletion in transitional disks
• Gas inside the 97 au cavity around the transition disk Sz\,91
• New disk discovered with VLT/SPHERE around the M star GSC 07396-00759
• A Herschel view of protoplanetary disks in the $\sigma$ Ori cluster
• Resolved Multifrequency Radio Observations of GG Tau
• The first 40 million years of circumstellar disk evolution: the signature of terrestrial planet formation
• GW Ori: Inner disk readjustments in a triple system
• Magnetic fields in circumstellar disks: The potential of Zeeman observations
• Circumbinary Ring, Circumstellar disks and accretion in the binary system UY Aurigae
• The Evolution of Inner Disk Gas in Transition Disks
• AB Aur, a Rosetta stone for studies of planet formation (II): H${}_2$S detection and sulfur budget
• Close-in Super-Earths: The first and the last stages of planet formation in an MRI-accreting disc
• Characterizing the morphology of the debris disk around the low-mass star GSC~07396-00759
• Interpreting Brightness Asymmetries in Transition Disks: Vortex at Dead Zone or Planet Carved Gap Edges?
• Mapping of shadows cast on a protoplanetary disk by a close binary system
• The Transitional Disk around IRAS 04125+2902
• Characteristics of small protoplanetary disc warps in kinematic observations
• A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
• Variability in the CO ro-vibrational lines from HD163296
• High-resolution ALMA observations of V4046Sgr: a circumbinary disc with a thin ring
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Chemical enrichment of the planet forming region as probed by accretion
• The steady-state hydrodynamics of a long-lived disc: planetary system architecture and prospects of observing a circumplanetary disc shadow in V4046Sgr
• NaCo polarimetric observations of Sz 91 transitional disk: a remarkable case of dust filtering
• HCO+ Detection of Dust-Depleted Gas in the Inner Hole of the LkCa 15 Pre-Transitional Disk
• Accretion and OH Photodissociation at a Nearby T Tauri System in the beta Pictoris Moving Group
• Evolution of circumbinary protoplanetary disks with photoevaporative winds driven by External Far Ultraviolet Radiation
• Constraints on a Putative Planet Sculpting the V4046 Sagittarii Circumbinary Disk
• ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
• Characterization of very wide companion candidates to young stars with planets and disks
• A Brief History of the Study of Nearby Young Moving Groups and Their Members
• Ortho-Para Chemistry of H2CO in the Protoplanetary Disk TW Hya
• The Dispersal of Planet-forming discs: Theory confronts Observations