Investigating the Relative Gas and Small Dust Grain Surface Heights in Protoplanetary Disks

Abstract

Dust evolution in protoplanetary disks from small dust grains to pebbles is key to the planet formation process. The gas in protoplanetary disks should influence the vertical distribution of small dust grains ($\sim$1 $\mu m$) in the disk.Utilizing archival near-infrared polarized light and millimeter observations, we can measure the scale height and the flare parameter $\beta$ of the small dust grain scattering surface and ${}^{12}$CO gas emission surface for three protoplanetary disks IM Lup, HD 163296, and HD 97048 (CU Cha). For two systems, IM Lup and HD 163296, the ${}^{12}$CO gas and small dust grains at small radii from the star have similar heights but at larger radii ($>$100 au) the dust grain scattering surface height is lower than the ${}^{12}$CO gas emission surface height. In the case of HD 97048, the small dust grain scattering surface has similar heights to the ${}^{12}$CO gas emission surface at all radii. We ran a protoplanetary disk radiative transfer model of a generic protoplanetary disk with TORUS and showed that there is no difference between the observed scattering surface and ${}^{12}$CO emission surface. We also performed analytical modeling of the system and found that gas-to-dust ratios larger than 100 could explain the observed difference in IM Lup and HD 163296. This is the first direct comparison of observations of gas and small dust grain heights distribution in protoplanetary disks. Future observations of gas emission and near-infrared scattered light instruments are needed to look for similar trends in other protoplanetary disks.

arXiv commentAccepted ApJ, 13 pages, 3 figures, 4 tables

References in corpus (36)

• The Gaia mission
• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• An atomic and molecular database for analysis of submillimetre line observations
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Passive irradiated circumstellar disks with an inner hole
• Gas- and dust evolution in protoplanetary disks
• Accretion Disks around Young Objects. I. The Detailed Vertical Structure
• Rotational quenching of CO due to H${}_2$ collisions
• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
• Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars
• A Kinematical Detection of Two Embedded Jupiter Mass Planets in HD 163296
• A Three-Dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk using DCO${}^{+}$
• A Parametric Modeling Approach to Measuring the Gas Masses of Circumstellar Disks
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• Gaia DR2 study of Herbig Ae/Be stars
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• Observations of edge-on protoplanetary disks with ALMA I. Results from continuum data
• Different dust and gas radial extents in protoplanetary disks: consistent models of grain growth and CO emission
• Evolution of emission line activity in intermediate mass young stars
• Empirical Constraints on Turbulence in Protoplanetary Accretion Disks
• Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE
• The accretion rates and mechanisms of Herbig Ae/Be stars
• A triple star system with a misaligned and warped circumstellar disk shaped by disk tearing
• Three-dimensional dust radiative-transfer models: The Pinwheel Nebula of WR104
• A break in the gas and dust surface density of the disc around the T Tauri star IM Lup
• The circumstellar disk HD169142: gas, dust and planets acting in concert?
• Polarized disk emission from Herbig Ae/Be stars observed using Gemini Planet Imager: HD 144432, HD 150193, HD 163296, and HD 169142
• The HD 163296 Circumstellar Disk in Scattered Light: Evidence of Time-Variable Self-Shadowing
• ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT) II: Vertical stratification of CO, CS, CN, H${}_2$CO, and CH${}_3$OH in a Class I disk
• ALMA reveals the anatomy of the mm-sized dust and molecular gas in the HD 97048 disk
• HD 169142 in the eyes of ZIMPOL/SPHERE
• An algorithm for Monte-Carlo time-dependent radiation transfer
• Multi-epoch Direct Imaging and Time-Variable Scattered Light Morphology of the HD 163296 Protoplanetary Disk
• Three-dimensional molecular line transfer: A simulated star-forming region
• Disk Illumination and Jet Variability of the Herbig Ae Star HD 163296 Using Multi-Epoch HST/STIS Optical, Near-IR, and Radio Imagery and Spectroscopy
• Radiative scale-height and shadows in protoplanetary disks

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• Gemini-LIGHTS: Herbig Ae/Be and massive T-Tauri protoplanetary disks imaged with Gemini Planet Imager
• Mapping Protoplanetary Disk Vertical Structure with CO Isotopologue Line Emission
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• Constraining the turbulence and the dust disk in IM Lup: onset of planetesimal formation
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• A dichotomy in group II Herbig disks: ALMA gas disk height measurements show both shadowed large vertically extended disks and compact flat disks
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• Quantitative polarimetry for the transition disk in RX J1604.3-213010
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• Size-selective accretion of dust onto CPDs: Low CPD masses and filtration of larger grains
• Scattering and sublimation: a multi-scale view of $\mu$m-sized dust in the inclined disc of HD 145718
• Vertical Structure of Protoplanetary Disks in Scattered Light: A large sample analysis
• CO Line Emission Surfaces and Vertical Structure in Mid-Inclination Protoplanetary Disks