Detailed modeling of dust distribution in the disk of HD 142527

Abstract

We investigate the dust distribution in the crescent disk around HD 142527 based on the continuum emission at $890\mu \mathrm{m}$ obtained by ALMA Cycle 0. The map is divided into $18$ azimuthal sectors, and the radial intensity profile in each sector is reproduced with a 2D disk model. Our model takes account of scattering and inclination of the disk as well as the azimuthal dependence in intensity. When the dust is assumed to have the conventional composition and maximum size of $1\mathrm{mm}$, the northwestern region ($PA=329^{\circ }-29^{\circ }$) cannot be reproduced. This is because the model intensity gets insensitive to the increase in surface density due to heavy self-scattering, reaching its ceiling much lower than the observed intensity. The ceiling depends on the position angle. When the scattering opacity is reduced by a factor of $10$, the intensity distribution is reproduced successfully in all the sectors including those in the northwestern region. The best fit model parameters depend little on the scattering opacity in the southern region where the disk is optically thin. The contrast of dust surface density along $PA$ is derived to be about $40$, much smaller than the value for the cases of conventional opacities ($70-130$). These results strongly suggest that the albedo is lower than considered by some reasons at least in the northwestern region.

arXiv comment27 pages (single column), 9 figures. This article has been accepted for publication in PASJ Published by Oxford University Press

References in corpus (31)

• Protoplanetary Disks and Their Evolution
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• A Major Asymmetric Dust Trap in a Transition Disk
• Evidence for a developing gap in a 10 Myr old protoplanetary disk
• Observations of gas flows inside a protoplanetary gap
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Millimeter-wave polarization of protoplanetary disks due to dust scattering
• Large-Scale Asymmetries in the Transitional Disks of SAO 206462 and SR 21
• Resolved gas cavities in transitional disks inferred from CO isotopologues with ALMA
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• Evidence for dust clearing through resolved submillimeter imaging
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• A Spitzer Census of Transitional Protoplanetary Disks with AU-Scale Inner Holes
• Steady state of dust distributions in disk vortices: Observational predictions and applications to transitional disks
• Local Enhancement of Surface Density in the Protoplanetary Ring Surrounding HD 142527
• An azimuthal asymmetry in the LkHa 330 disk
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Dust Trapping by Vortices in Transitional Disks: Evidence for Non-ideal MHD Effects in Protoplanetary Disks
• Lopsided dust rings in transition disks
• Physical and Chemical Structure of Protoplanetary Disks with Grain Growth
• The complex circumstellar environment of HD142527
• Submillimeter polarization observation of the protoplanetary disk around HD 142527
• A compact concentration of large grains in the HD142527 protoplanetary dust trap
• Gas and dust hydrodynamical simulations of massive lopsided transition discs - II. Dust concentration
• Light scattering by fractal dust aggregates: I. Angular dependence of scattering
• The Asymmetric Thermal Emission of Protoplanetary Disk Surrounding HD 142527 Seen by Subaru/COMICS
• Polarized Light Imaging of the HD 142527 Transition Disk with the Gemini Planet Imager: Dust around the Close-in Companion
• Fast Modes and Dusty Horseshoes in Transitional Disks
• Significant Gas-to-Dust Ratio Asymmetry and Variation in the Disk of HD 142527 and the Indication of Gas Depletion
• Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
• Kinetic Scheme for Solving M1 Model of Radiative Transfer

Cited by in corpus (10)

• The anomalously low (sub)millimeter spectral indices of some protoplanetary disks may be explained by dust self-scattering
• Molecules with ALMA at Planet-forming Scales (MAPS) XIV: Revealing disk substructures in multi-wavelength continuum emission
• Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation
• Effects of scattering, temperature gradients, and settling on the derived dust properties of observed protoplanetary disks
• A family portrait of disk inner rims around Herbig Ae/Be stars: Hunting for warps, rings, self shadowing, and misalignments in the inner astronomical units
• A Spatially Resolved AU-scale Inner Disk around DM Tau
• Non-Keplerian spirals, a gas-pressure dust trap and an eccentric gas cavity in the circumbinary disc around HD 142527
• Ring formation by coagulation of dust aggregates in early phase of disk evolution around a protostar
• Investigating the gas-to-dust ratio in the protoplanetary disk of HD 142527
• Characterization of the dust content in the ring around Sz 91: indications for planetesimal formation?