A millimeter-multiwavelength continuum study of VLA 1623 West

Abstract

VLA 1623 West is an ambiguous source that has been described as a shocked cloudlet as well as a protostellar disk. We use deep ALMA 1.3 and 0.87 millimeter observations to constrain its shape and structure to determine its origins better. We use a series of geometric models to fit the uv visibilities at both wavelengths with GALARIO. Although the Real visibilities show structures similar to what has been identified as gaps and rings in protoplanetary disks, we find that a modified Flat-Topped Gaussian at high inclination provides the best fit to the observations. This fit agrees well with expectations for an optically thick, highly inclined disk. Nevertheless, we find that the geometric models consistently yield positive residuals at the four corners of the disk at both wavelengths. We interpret these residuals as evidence that the disk is flared in the millimeter dust. We use a simple toy model for an edge-on flared disk and find that the residuals best match a disk with flaring that is mainly restricted to the outer disk at $R\gtrsim 30$ au. Thus, VLA 1623W may represent a young protostellar disk where the large dust grains have not yet had enough time to settle into the mid-plane. This result may have implications for how disk evolution and vertical dust settling impact the initial conditions leading to planet formation.

Accepted by ApJ, 12 pages, 13 figures

References in corpus (23)

• Protoplanetary Disk Structures in Ophiuchus
• One Solution to the Mass Budget Problem for Planet Formation: Optically Thick Disks with Dust Scattering
• Dust masses of young disks: constraining the initial solid reservoir for planet formation
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• Four annular structures in a protostellar disk less than 500,000 years old
• Observations of edge-on protoplanetary disks with ALMA I. Results from continuum data
• A highly settled disk around Oph 163131
• On the diversity of asymmetries in gapped protoplanetary disks
• Frankenstein: Protoplanetary disc brightness profile reconstruction at sub-beam resolution with a rapid Gaussian process
• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. III. Substructures in Protostellar Disks
• Estimate on dust scale height from ALMA dust continuum image of the HD 163296 protoplanetary disk
• Multi-wavelength continuum sizes of protoplanetary discs: scaling relations and implications for grain growth and radial drift
• [OI]63micron jets in class 0 sources detected by Herschel
• Spatial segregation of dust grains in transition disks. SPHERE observations of 2MASS J16083070-3828268 and RXJ1852.3-3700
• Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
• A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
• FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 1623$-$2417
• The young protostellar disk in IRAS16293-2422 B is hot and shows signatures of gravitational instability
• Misaligned Twin Molecular Outflows From Class-0 Proto-stellar Binary System VLA 1623A Unveiled by ALMA
• Early planet formation in embedded protostellar disks: Setting the stage for the first generation of planetesimals
• The Anatomy of an Unusual Edge-on Protoplanetary Disk I. Dust Settling in a Cold Disk
• Formation of dust clumps with sub-Jupiter mass and cold shadowed region in gravitationally unstable disk around Class 0/I protostar in L1527 IRS
• No evidence of the significant grain growth but tentative discovery of disk substructure in a disk around the Class I Protostar L1489 IRS

Cited by in corpus (6)

• Empirical constraints on turbulence in proto-planetary discs
• Early Planet Formation in Embedded Disks (eDisk). II. Limited Dust Settling and Prominent Snow Surfaces in the Edge-on Class I Disk IRAS 04302+2247
• Modest dust settling in the IRAS04302+2247 Class I protoplanetary disk
• FAUST VIII. The protostellar disk of VLA 1623-2417 W and its streamers imaged by ALMA
• IRAS4A1: Multi-wavelength continuum analysis of a very flared Class 0 disk
• Constraining the Stellar Masses and Origin of the Protostellar VLA 1623 System