Spiral Structure and Differential Dust Size Distribution in the LkHa 330 Disk

Abstract

Dust trapping accelerates the coagulation of dust particles, and thus it represents an initial step toward the formation of planetesimals. We report $H$-band (1.6 um) linear polarimetric observations and 0.87 mm interferometric continuum observations toward a transitional disk around LkHa 330. As results, a pair of spiral arms were detected in the $H$-band emission and an asymmetric (potentially arm-like) structure was detected in the 0.87 mm continuum emission. We discuss the origin of the spiral arm and the asymmetric structure, and suggest that a massive unseen planet is the most plausible explanation. The possibility of dust trapping and grain growth causing the asymmetric structure was also investigated through the opacity index (beta) by plotting the observed SED slope between 0.87 mm from our SMA observation and 1.3 mm from literature. The results imply that grains are indistinguishable from ISM-like dust in the east side ($beta=2.0pm0.5$), but much smaller in the west side $beta=0.7_{-0.4}^{+0.5}$, indicating differential dust size distribution between the two sides of the disk. Combining the results of near-infrared and submillimeter observations, we conjecture that the spiral arms exist at the upper surface and an asymmetric structure resides in the disk interior. Future observations at centimeter wavelengths and differential polarization imaging in other bands (Y to K) with extreme AO imagers are required to understand how large dust grains form and to further explore the dust distribution in the disk.

arXiv comment10 pages, 4 figures, AJ accepted for publication

References in corpus (41)

• Infrared Emission from Interstellar Dust. II. The Diffuse Interstellar Medium
• Circumstellar Dust Disks in Taurus-Auriga: The Submillimeter Perspective
• Resolved Images of Large Cavities in Protoplanetary Transition Disks
• A Major Asymmetric Dust Trap in a Transition Disk
• FARGO: a fast eulerian transport algorithm for differentially rotating disks
• Accretion Disks Around Young Objects. III. Grain Growth
• On the Submillimeter Opacity of Protoplanetary Disks
• Flaring vs. self-shadowed disks: the SEDs of Herbig Ae/Be stars
• Ring shaped dust accumulation in transition disks
• Dust Filtration by Planet-Induced Gap Edges: Implications for Transitional Disks
• Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths
• 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
• Trapping dust particles in the outer regions of protoplanetary disks
• Bolocam Survey for 1.1 mm Dust Continuum Emission in the c2d Legacy Clouds. I. Perseus
• A dual-frequency sub-arcsecond study of proto-planetary disks at mm wavelengths: First evidence for radial variations of the dust properties
• Asymmetric features in the protoplanetary disk MWC758
• Bolocam Survey for 1.1 mm Dust Continuum Emission in the c2d Legacy Clouds. II. Ophiuchus
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• 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
• Planets opening dust gaps in gas disks
• Dust grain growth in rho-Ophiuchi protoplanetary disks
• Observational Signatures of Planets in Protoplanetary Disks II: Spiral Arms Observed in Scattered Light Imaging Can be Induced by Planets
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• Evidence for dust clearing through resolved submillimeter imaging
• A search for evolved dust in Herbig Ae stars
• Trapping Solids at the Inner Edge of the Dead Zone: 3-D Global MHD Simulations
• Small vs large dust grains in transitional disks: do different cavity sizes indicate a planet?
• Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps
• Polarimetric Imaging of Large Cavity Structures in the Pre-transitional Protoplanetary Disk around PDS 70: Observations of the disk
• An azimuthal asymmetry in the LkHa 330 disk
• Lopsided dust rings in transition disks
• Accretion kinematics through the warped transition disk in HD142527 from resolved CO(6-5) observations
• On the structure of the transition disk around TW Hya
• Dust-trapping Rossby vortices in protoplanetary disks
• Discovery of a Two-Armed Spiral Structure in the Gapped Disk in HD 100453
• An M Dwarf Companion and Its Induced Spiral Arms in the HD 100453 Protoplanetary Disk
• Speckle Suppression Through Dual Imaging Polarimetry, and a Ground-Based Image of the HR 4796A Circumstellar Disk
• A concentration of centimeter-sized grains in the Oph IRS 48 dust trap
• Planetary Signatures in the SAO 206462 (HD 135344B) Disk: A Spiral Arm Passing Through Vortex?
• Reduction of polarimetric data using Mueller calculus applied to Nasmyth instruments

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• Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri Disks
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• The Disk Substructures at High Angular Resolution Project (DSHARP): III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks
• Evolution of protoplanetary disks from their taxonomy in scattered light: spirals, rings, cavities, and shadows
• Spiral Arms in Disks: Planets or Gravitational Instability?
• Modeling of deep gaps created by giant planets in protoplanetary discs
• How Bright are Planet-Induced Spiral Arms in Scattered Light?
• The Orbit of the Companion to HD 100453A: Binary-Driven Spiral Arms in a Protoplanetary Disk
• Thermal Infrared Imaging of MWC 758 with the Large Binocular Telescope: Planetary Driven Spiral Arms?
• Impacts of dust feedback on a dust ring induced by a planet in a protoplanetary disk
• Spirals inside the millimeter cavity of transition disk SR 21
• The Planetary Luminosity Problem: "Missing Planets" and the Observational Consequences of Episodic Accretion
• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• Subaru/HiCIAO $H{K}_{\mathrm{s}}$ imaging of LkH$\alpha$ 330 - multi-band detection of the gap and spiral-like structures
• The Observability Of Vortex-Driven Spiral Arms In Protoplanetary Disk: Basic Spiral Properties
• A Decade of MWC 758 Disk Images: Where Are the Spiral-Arm-Driving Planets?
• Meso-scale Instability Triggered by Dust Feedback in Dusty Rings: Origin and Observational Implications
• Termination of an inward migration of a gap-opening planet triggered by dust feedback
• Dust dynamics in planet-driven spirals
• ALMA observation of the protoplanetary disk around WW Cha: faint double-peaked ring and asymmetric structure
• A Dust Trap in the Young Multiple System HD 34700
• Distributions of gas and small and large grains in the LkH$\alpha 330$ disk trace a young planetary system
• Identification and parameter determination of F-type Herbig stars from LAMOST DR8
• A spatially-resolved large cavity of the J0337 protoplanetary disk in Perseus