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.

arXiv commentAccepted by ApJ, 12 pages, 13 figures

References in corpus (54)

• emcee: The MCMC Hammer
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• Protoplanetary Disks and Their Evolution
• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Protoplanetary Disk Structures in Ophiuchus
• Ringed Substructure and a Gap at 1 AU in the Nearest Protoplanetary Disk
• Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region
• The Disk Substructures at High Angular Resolution Project (DSHARP): II. Characteristics of Annular Substructures
• Unveiling the Circumstellar Envelope and Disk: A Sub-Arcsecond Survey of Circumstellar Structures
• Dust and Gas in the disc of HL Tauri: Surface density, dust settling, and dust-to-gas ratio
• Millimeter-wave polarization of protoplanetary disks due to dust scattering
• A Keplerian disk around a Class 0 source: ALMA observations of VLA1623A
• 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
• GALARIO: a GPU Accelerated Library for Analysing Radio Interferometer Observations
• The JCMT Gould Belt Survey: First results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population
• Protoplanetary Disk Properties in the Orion Nebula Cluster: Initial Results from Deep, High-Resolution ALMA Observations
• A highly settled disk around Oph 163131
• Gaia-DR2 confirms VLBA parallaxes in Ophiuchus, Serpens and Aquila
• On the diversity of asymmetries in gapped protoplanetary disks
• Frankenstein: Protoplanetary disc brightness profile reconstruction at sub-beam resolution with a rapid Gaussian process
• Scattering-Produced (Sub)millimeter Polarization in Inclined Disks: Optical Depth Effects, Near-Far Side Asymmetry, and Dust Settling
• Dust distribution in protoplanetary disks - Vertical settling and radial migration
• 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
• Disentangling the entangled: Observations and analysis of the triple non-coeval protostellar system VLA1623
• Multi-wavelength continuum sizes of protoplanetary discs: scaling relations and implications for grain growth and radial drift
• Dust Polarization Toward Embedded Protostars in Ophiuchus with ALMA. I. VLA 1623
• Dust Polarization Toward Embedded Protostars in Ophiuchus with ALMA. III. Survey Overview
• [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
• ALMA Observations of Polarized 872 $\mu$m Dust Emission from the Protostellar Systems VLA 1623 and L1527
• Effects of scattering, temperature gradients, and settling on the derived dust properties of observed protoplanetary disks
• The Molecular Outflows in the rho Ophiuchi Main Cloud: Implications For Turbulence Generation
• The JCMT Legacy Survey of the Gould Belt: a molecular line study of the Ophiuchus molecular cloud
• Limits on Millimeter Continuum Emission from Circumplanetary Material in the DSHARP Disks
• ALMA Observations of Starless Core Substructure in Ophiuchus
• Protoplanetary Disks in the Orion Nebula Cluster: Gas Disk Morphologies and Kinematics as seen with ALMA
• 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
• Disentangling the jet emission from protostellar systems. The ALMA view of VLA1623
• Sub-arcsecond SMA observations of the prototype Class 0 object VLA1623 at 1.3 mm: A single protostar with a structured outflow cavity ?
• Extremely Dense Cores associated with Chandra Sources in Ophiuchus A: Forming Brown Dwarfs Unveiled?
• Formation of dust clumps with sub-Jupiter mass and cold shadowed region in gravitationally unstable disk around Class 0/I protostar in L1527 IRS
• Revised SED of the triple protostellar system VLA 1623-2417
• No evidence of the significant grain growth but tentative discovery of disk substructure in a disk around the Class I Protostar L1489 IRS

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• 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
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