High Resolution 8 mm and 1 cm Polarization of IRAS 4A from the VLA Nascent Disk and Multiplicity (VANDAM) Survey

Abstract

Magnetic fields can regulate disk formation, accretion and jet launching. Until recently, it has been difficult to obtain high resolution observations of the magnetic fields of the youngest protostars in the critical region near the protostar. The VANDAM survey is observing all known protostars in the Perseus Molecular Cloud. Here we present the polarization data of IRAS 4A. We find that with ~ 0.2'' (50 AU) resolution at λ = 8.1 and 10.3 mm, the inferred magnetic field is consistent with a circular morphology, in marked contrast with the hourglass morphology seen on larger scales. This morphology is consistent with frozen-in field lines that were dragged in by rotating material entering the infall region. The field morphology is reminiscent of rotating circumstellar material near the protostar. This is the first polarization detection of a protostar at these wavelengths. We conclude from our observations that the dust emission is optically thin with β ~ 1.3, suggesting that mm/cm-sized grains have grown and survived in the short lifetime of the protostar.

arXiv commentAccepted to ApJL. 13 pages, 4 figures

References in corpus (31)

• Theory of Star Formation
• Unveiling the Circumstellar Envelope and Disk: A Sub-Arcsecond Survey of Circumstellar Structures
• Magnetic Fields in the Formation of Sun-Like Stars
• Magnetic processes in a collapsing dense core. I Accretion and Ejection
• Protostellar disk formation and transport of angular momentum during magnetized core collapse
• PROSAC: A Submillimeter Array Survey of Low-Mass Protostars. I. Overview of Program: Envelopes, Disks, Outflows and Hot Cores
• A 0.2 solar mass protostar with a Keplerian disk in the very young L1527 IRS system
• Magnetic Braking and Protostellar Disk Formation: The Ideal MHD Limit
• Astrometry of Water Maser Sources in Nearby Molecular Clouds with VERA - II. SVS 13 in NGC 1333
• The Formation and Destruction of Molecular Clouds and Galactic Star Formation
• TADPOL: A 1.3 mm Survey of Dust Polarization in Star-forming Cores and Regions
• A Keplerian disk around a Class 0 source: ALMA observations of VLA1623A
• Disk formation during collapse of magnetized protostellar cores
• Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Non-Ideal Magnetohydrodynamic Effects and Early Formation of Circumstellar Disks
• Nonideal MHD Effects and Magnetic Braking Catastrophe in Protostellar Disk Formation
• Misalignment of Magnetic Fields and Outflows in Protostellar Cores
• Spatially Resolved Magnetic Field Structure in the Disk of a T Tauri Star
• Grain Growth and Density Distribution of the Youngest Protostellar Systems
• Alignment Between Flattened Protostellar Infall Envelopes and Ambient Magnetic Fields
• Grain Alignment and Polarized Emission from Magnetized T Tauri Disks
• Detection of a Magnetized Disk around a Very Young Protostar
• The Envelope and Embedded Disk around the Class 0 Protostar L1157-mm: Dual-wavelength Interferometric Observations and Modeling
• Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?
• Astrometry of H${}_2$O Masers in Nearby Star-Forming Regions with VERA --- IV. L1448C
• The Magnetic Field in the Class 0 Protostellar Disk of L1527
• Resolved Depletion Zones and Spatial Differentiation of N2H+ and N2D+
• Exploring Magnetic Field Structure in Star-Forming Cores with Polarization of Thermal Dust Emission
• The VLA Nascent Disk And Multiplicity (VANDAM) Survey of Perseus Protostars. Resolving the Sub-Arcsecond Binary System in NGC 1333 IRAS2A
• Comparing star formation models with interferometric observations of the protostar NGC 1333 IRAS 4A. I. Magnetohydrodynamic collapse models
• On the Role of Pseudodisk Warping and Reconnection in Protostellar Disk Formation in Turbulent Magnetized Cores
• Evidence for Large Grains in the Star-forming Filament OMC-2/3

Cited by in corpus (45)

• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. A Statistical Characterization of Class 0 and I Protostellar Disks
• The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). II. Multiplicity of Protostars in the Perseus Molecular Cloud
• The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). IV. Free-Free Emission from Protostars: Links to Infrared Properties, Outflow Tracers, and Protostellar Disk Masses
• Radiative grain alignment in protoplanetary disks: Implications for polarimetric observations
• ALMA Reveals Transition of Polarization Pattern with Wavelength in HL Tau's Disk
• Magnetically regulated collapse in the B335 protostar ? I. ALMA observations of the polarized dust emission
• Interferometric observations of magnetic fields in forming stars
• ALMA observations of polarized emission toward the CW Tau and DG Tau protoplanetary disks: constraints on dust grain growth and settling
• ALMA observations of dust polarization and molecular line emission from the Class 0 protostellar source Serpens SMM1
• Unveiling the Role of the Magnetic Field at the Smallest Scales of Star Formation
• ALMA observations of polarization from dust scattering in the IM Lup protoplanetary disk
• ALMA's Polarized View of 10 Protostars in the Perseus Molecular Cloud
• Scattering-Produced (Sub)millimeter Polarization in Inclined Disks: Optical Depth Effects, Near-Far Side Asymmetry, and Dust Settling
• The role of magnetic fields in the formation of protostellar discs
• Change of Magnetic Field$-$Gas Alignment at Gravity-Driven Alfvénic Transition in Molecular Clouds: Implications for Dust Polarization Observations
• The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). V. 18 Candidate Disks around Class 0 and I Protostars in the Perseus Molecular Cloud
• Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation
• Systematic analysis of spectral energy distributions and the dust opacity indices for Class 0 young stellar objects
• Resolving the polarized dust emission of the disk around the massive star powering the HH~80-81 radio jet
• Disk Polarization From Both Emission and Scattering of Magnetically Aligned Grains: The Case of NGC 1333 IRAS4A1
• Helical Magnetic Fields in the NGC1333 IRAS 4A Protostellar Outflows
• Dust Polarization Toward Embedded Protostars in Ophiuchus with ALMA. II. IRAS 16293-2422
• Radial variations in grain sizes and dust scale heights in the protoplanetary disk around HD 163296 revealed by ALMA polarization observation
• Protostellar accretion traced with chemistry. High resolution C18O and continuum observations towards deeply embedded protostars in Perseus
• Implications of a hot atmosphere/corino from ALMA observations towards NGC1333 IRAS 4A1
• Magnetic fields in protoplanetary disks: from MHD simulations to ALMA observations
• Modeling Dust Polarization Observations of Molecular Clouds through MHD Simulations
• Resolving Linear Polarization due to Emission and Extinction of Aligned Dust Grains on NGC1333 IRAS4A with JVLA and ALMA
• Validating Scattering-Induced (Sub)millimeter Disk Polarization through the Spectral Index, Wavelength-Dependent Polarization Pattern, and Polarization Spectrum: The Case of HD 163296
• Detection of Linearly Polarized 6.9 mm Continuum Emission from the Class 0 Young Stellar Object NGC1333 IRAS4A
• Do we need non-ideal magnetohydrodynamics to model protostellar discs?
• Detection of Irregular, Sub-mm Opaque Structures in the Orion Molecular Clouds: Protostars within 10000 years of formation?
• Relative Alignment between Dense Molecular Cores and Ambient Magnetic Field: The Synergy of Numerical Models and Observations
• The Infall Motion in the Low-Mass Protostellar Binary NGC 1333 IRAS 4A1/4A2
• 1.3mm polarized emission in the circumstellar disk of a massive protostar
• Dust Growth and Dynamics in Protoplanetary Nebulae: Implications for Opacity, Thermal Profile and Gravitational Instability
• Detection of 40-48 GHz dust continuum linear polarization towards the Class 0 young stellar object IRAS 16293-2422
• IRAS4A1: Multi-wavelength continuum analysis of a very flared Class 0 disk
• Protostar L1455 IRS1: Rotating Disk Connecting to Filamentary Network
• Probing the Temperature Structure of Optically Thick Disks Using Polarized Emission of Aligned Grains
• Rapid grain growth in post-AGB disc systems from far-infrared and sub-millimetre photometry
• A wind-driving disc model for the mm-wavelength polarization structure of HL Tau
• A 16 au Binary in the Class 0 Protostar L1157 MMS
• Synthetic Modelling of Polarized Dust Emission in Intermediate-Mass YSOs: I: Constraining the Role of Iron Inclusions and Inelastic Relaxation on Grain Alignment with ALMA Polarization
• Emission from Magnetized Accretion Disks around Young Stars