Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
arXiv:2601.15371 · doi:10.3847/1538-4357/ae3bcd
Abstract
We study the kinematics of condensations in 30 fields forming high-mass stars with ALMA at a high-resolution of ~0.08'' on average (~230 au). The presence of disks is important for feeding high-mass stars without feedback halting growth as their masses increase. In the search for velocity gradients resembling rotation that can reveal the presence of disks, we analyze the emission of gas tracers in 49 objects using CHOH, CHCN, and tentative detections of HNCO and cis-HCOOH. Most of the velocity distributions show velocity gradients indicative of rotation. We reveal a total of 32 disk candidates, the largest sample to date that has been uniformly analyzed at a few hundred au scales in the high-mass regime. Their position-velocity maps are generally asymmetric with one side brighter than the opposite. We successfully fit a power law to the position-velocity maps of the disk candidates and find indices between -0.5 (Keplerian rotation) and -1 (rotation under specific angular momentum conservation) with a median of -0.7. Under Keplerian rotation assumption, we estimate central masses, uncorrected for inclination, ranging between 7 to 45 M. Excluding outliers, the disk candidates are relatively more compact (<200 au) and less massive (<5 M) than previous results at coarser angular resolution. We calculate an average Toomre- parameter and find that most are gravitationally unstable (median of 0.5). We conclude that these observations offer the first opportunity to separate the disk and envelope components of hot cores on a statistically significant sample, and confirm that anisotropic collapse plays an role in feeding high-mass (proto)stars.
arXiv comment29 pages, 8 figures, 7 tables. Accepted for publication in ApJ
References in corpus (72)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Astropy: A Community Python Package for Astronomy
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- Binary interaction dominates the evolution of massive stars
- Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
- Toward Understanding Massive Star Formation
- CASA, the Common Astronomy Software Applications for Radio Astronomy
- Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
- The Formation of Massive Star Systems by Accretion
- Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores
- The Disk Substructures at High Angular Resolution Project (DSHARP): V. Interpreting ALMA maps of protoplanetary disks in terms of a dust model
- ATLASGAL --- properties of a complete sample of Galactic clumps
- On the diversity and statistical properties of protostellar discs
- Accretion disks in luminous young stellar objects
- On the existence of accretion-driven bursts in massive star formation
- Radiation-Hydrodynamic Simulations of Massive Star Formation with Protostellar Outflows
- A Keplerian-like disk around the forming O-type star AFGL 4176
- ALMA Observations of the Transition from Infall Motion to Keplerian Rotation around the Late-phase Protostar TMC-1A
- A candidate circumbinary Keplerian disk in G35.20-0.74 N: A study with ALMA
- First hydrodynamics simulations of radiation forces and photoionization feedback in massive star formation
- Gravity Driven Magnetic Field at ~1000 au Scales in High-mass Star Formation
- G11.92-0.61 MM 1: A fragmented Keplerian disk surrounding a proto-O star
- A necklace of dense cores in the high-mass star forming region G35.20-0.74N: ALMA observations
- Infall Signatures in a Prestellar Core embedded in the High-Mass 70 m Dark IRDC G331.372-00.116
- Molecular Line Emission from Massive Protostellar Disks: Predictions for ALMA and the EVLA
- Bipolar Molecular Outflows and Hot Cores in GLIMPSE Extended Green Objects (EGOs)
- Cloudlet capture by Transitional Disk and FU Orionis stars
- Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
- A Substellar-Mass Protostar and its Outflow of IRAS 15398-3359 Revealed by Subarcsecond-Resolution Observations of HCO and CCH
- The Impact of Feedback During Massive Star Formation by Core Accretion
- STATCONT: A statistical continuum level determination method for line-rich sources
- Accretion and magnetic field morphology around Class 0 stage protostellar discs
- Multi-directional mass-accretion and collimated outflows in W51
- Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61
- Revealing the dynamics of Class 0 protostellar discs with ALMA
- SMA outflow/disk studies in the massive star-forming region IRAS18089-1732
- Radiative transfer modelling of W33A MM1: 3-D structure and dynamics of a complex massive star forming region
- Spiral arms and instability within the AFGL 4176 mm1 disc
- Resolving the Circumstellar Disk Around the Massive Protostar Driving the HH 80-81 Jet
- A Hot and Massive Accretion Disk around the High-Mass Protostar IRAS 20126+4104
- The ALMA view of W33A: A Spiral Filament Feeding the Candidate Disc in MM1-Main
- Disk structure around the Class I protostar L1489 IRS revealed by ALMA: a warped disk system
- Fragmentation and disk formation in high-mass star formation: The ALMA view of G351.77-0.54 at 0.06" resolution
- Magnetic Fields in Massive Star-Forming Regions (MagMaR) I. Linear Polarized Imaging of the UCHII Region G5.89-0.39
- An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS165474247
- An Ordered Envelope-disk Transition in the Massive Protostellar Source G339.88-1.26
- Digging into the Interior of Hot Cores with ALMA (DIHCA). I. Dissecting the High-mass Star-Forming Core G335.579-0.292 MM1
- Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
- Magnetic Fields in Massive Star-Forming Regions (MagMaR) II. Tomography Through Dust and Molecular Line Polarization in NGC 6334I(N)
- High-mass star formation at sub-50AU scales
- Digging into the Interior of Hot Cores with ALMA (DIHCA). III: The Chemical Link between NHCHO, HNCO, and HCO
- Modeling the accretion disk around the high-mass protostar GGD 27-MM1
- A Massive Star is Born: How Feedback from Stellar Winds, Radiation Pressure, and Collimated Outflows Limits Accretion onto Massive Stars
- Substructures in the Disk-Forming Region of the Class 0 Low-Mass Protostellar Source IRAS 16293-2422 Source A on a 10 au Scale
- A massive Keplerian protostellar disk with flyby-induced spirals in the Central Molecular Zone
- Digging into the Interior of Hot Cores with ALMA (DIHCA). II. Exploring the Inner Binary (Multiple) System Embedded in G335 MM1 ALMA1
- Kinematics and stability of high-mass protostellar disk candidates at sub-arcsecond resolution -- Insights from the IRAM NOEMA large program CORE
- Confirming the Explosive Outflow in G5.89 with ALMA
- Continuity of accretion from clumps to Class 0 high-mass protostars in SDC335
- Massive Protostars in a Protocluster -- A Multi-Scale ALMA View of G35.20-0.74N
- Salt-bearing disk candidates around high-mass young stellar objects
- A photoionized accretion disk around a young high-mass star
- FERIA: Flat Envelope Model with Rotation and Infall under Angular Momentum Conservation
- Discovery of a 500 au Protobinary in the Massive Prestellar Core G11.92-0.61 MM2
- Molecular Distributions of the Disk/Envelope System of L483: Principal Component Analysis for the Image Cube Data
- Digging into the Interior of Hot Cores with ALMA (DIHCA). V. Deuterium Fractionation of Methanol
- A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
- Synthetic Observations of the Infalling Rotating Envelope: Links between the Physical Structure and Observational Features
- Massive extended streamers feed high-mass young stars
- The Impact of Silicate Grain Coagulation on Millimeter Emission from Massive Protostellar Disks
- Surveys of clumps, cores, and condensations in Cygnus-X: Searching for Keplerian disks on the scale of 500 au