Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16

Abstract

We present the highest angular resolution (20x15mas - 44x33au) Atacama Large Millimeter/sub-millimeter Array (ALMA) observations currently possible of the proto-O-star G17.64+0.16 in Band 6. The Cycle 5 observations with baselines out to 16km probes scales <50au and reveal the rotating disc around G17.64+0.16, a massive forming O-type star. The disc has a ring-like enhancement in the dust emission, especially visible as arc structures to the north and south. The Keplerian kinematics are most prominently seen in the vibrationally excited water line, H2O (Eu=3461.9K). The mass of the central source found by modelling the Keplerian rotation is consistent with 45+/-10Mo. The H30alpha (231.9GHz) radio-recombination line and the SiO (5-4) molecular line were detected at up to the 10 sigma$ level. The estimated disc mass is 0.6-2.6Mo under the optically thin assumption. Analysis of the Toomre Q parameter, in the optically thin regime, indicates that the disc stability is highly dependent on temperature. The disc currently appears stable for temperatures >150K, this does not preclude that the substructures formed earlier through disc fragmentation.

9 Total, inc references, appendix, long author list, 4 figures (inc appendix)

References in corpus (23)

• Binary interaction dominates the evolution of massive stars
• Evidence of fast pebble growth near condensation fronts in the HL Tau protoplanetary disk
• Three-dimensional simulation of massive star formation in the disk accretion scenario
• Shadows and spirals in the protoplanetary disk HD 100453
• The Tarantula Massive Binary Monitoring: I. Observational campaign and OB-type spectroscopic binaries
• Understanding Spatial and Spectral Morphologies of Ultracompact H II Regions
• An Unstable Truth: How Massive Stars get their Mass
• ALMA Observations of Infalling Flows toward the Keplerian Disk around the Class I Protostar L1489 IRS
• G11.92-0.61 MM1: A Keplerian disc around a massive young proto-O star
• Multiple rings in the transition disk and companion candidates around RXJ1615.3-3255. High contrast imaging with VLT/SPHERE
• Forming spectroscopic massive proto-binaries by disk fragmentation
• ALMA resolves the spiraling accretion flow in the luminous OB cluster forming region G33.92+0.11
• VLA observations of ammonia in high-mass star formation regions
• Multiple spiral arms in the disk around intermediate-mass binary HD 34700A
• Resolved 24.5 micron emission from massive young stellar objects
• CO emission tracing a warp or radial flow within $\lesssim$ 100 au in the HD 100546 protoplanetary disk
• Radiation-hydrodynamical simulations of massive star formation using Monte Carlo radiative transfer II. The formation of a 25 solar-mass star
• A multiple system of high-mass YSOs surrounded by disks in NGC7538 IRS1
• An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS16547$-$4247
• Revealing signatures of planets migrating in protoplanetary discs with ALMA multi-wavelength observations
• A pilot survey of the binarity of Massive Young Stellar Objects with $K$ band adaptive optics
• A 10-$M_{\odot }$ YSO with a Keplerian disk and a nonthermal radio jet
• A multi-scale exploration of a massive young stellar object - a transition disk around G305.20+0.21?

Cited by in corpus (49)

• Water in star-forming regions (WISH): Physics and chemistry from clouds to disks as probed by Herschel spectroscopy
• Spiral arms in the proto-planetary disc HD100453 detected with ALMA: evidence for binary-disc interaction and a vertical temperature gradient
• Formation and Evolution of Disks around Young Stellar Objects
• Modeling disk fragmentation and multiplicity in massive star formation
• Spiral arms and instability within the AFGL 4176 mm1 disc
• A highly non-Keplerian protoplanetary disc: Spiral structure in the gas disc of CQ Tau
• Establishing the evolutionary timescales of the massive star formation process through chemistry
• JWST Observations of Young protoStars (JOYS): overview of program and early results
• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
• Disk Kinematics and Stability in High-Mass Star Formation: Linking Simulations and Observations
• Parameter study for the burst mode of accretion in massive star formation
• The SEDIGISM survey: a search for molecular outflows
• Modeling the accretion disk around the high-mass protostar GGD 27-MM1
• Importance of source structure on complex organics emission. I. Observations of CH${}_3$OH from low-mass to high-mass protostars
• 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
• ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited H${}_2$O and OH lines
• Zooming into the Collimation Zone in a Massive Protostellar Jet
• A Detailed View of the Circumstellar Environment and Disk of the Forming O-star AFGL 4176
• ALMA observations of the Extended Green Object G19.01$-$0.03: I. A Keplerian disc in a massive protostellar system
• The ionized warped disk and disk wind of the massive protostar Monoceros R2-IRS2 seen with ALMA
• Massive Protostars in a Protocluster -- A Multi-Scale ALMA View of G35.20-0.74N
• Salt-bearing disk candidates around high-mass young stellar objects
• Clustered star formation at early evolutionary stages. Physical and chemical analysis of the young star-forming regions ISOSS J22478+6357 and ISOSS J23053+5953
• A photoionized accretion disk around a young high-mass star
• The first interferometric survey in the K-band of massive YSOs. On the hot dust, ionised gas, and binarity at au scales
• Importance of source structure on complex organics emission III. Effect of disks around massive protostars
• Unveiling the traits of massive young stellar objects through a multi-scale survey
• The H${}_2$O Spectrum of the Massive Protostar AFGL 2136 IRS 1 from 2 to 13 $\mu$m at High Resolution: Probing the Circumstellar Disk
• Physical conditions in the warped accretion disk of a massive star. 349 GHz ALMA observations of G023.01$-$00.41
• A search for radio jets from massive young stellar objects. Association of radio jets with H2O and CH3OH masers
• The disk-outflow system around the rare young O-type protostar W42-MME
• The burst mode of accretion in massive star formation with stellar inertia
• Massive Protostellar Disks as a Hot Laboratory of Silicate Grain Evolution
• Probing the low-mass end of the companion mass function for O-type stars
• Resolving the collimation zone of an intermediate-mass protostar
• Tying the geometrical traits of massive young stellar objects and their discs to a potential evolutionary sequence using infrared observations
• Formation of supermassive stars in the first stellar clusters: Dependence on the gas temperature
• The onset of stellar multiplicity in massive star formation: A search for low-mass companions of massive young stellar objects with $L^{\prime }$-band adaptive optics imaging
• High-Resolution M-band Spectroscopy of CO towards the Massive Young Stellar Binary W3 IRS5
• High-resolution SOFIA/EXES Spectroscopy of Water Absorption Lines in the Massive Young Binary W3 IRS 5
• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
• W49N MCN-a: a disk accreting massive protostar embedded in an early-phase hot molecular core
• First spatially resolved Na I and He I transitions towards an MYSO. Finding new tracers for the gaseous star/disc interface
• The Additional Representative Images for Legacy (ARI-L) project for the ALMA Science Archive
• Discs and outflows in the early phases of massive star formation: influence of magnetic fields and ambipolar diffusion
• HOTDISK. Finding Massive Protostellar Disks with Water and Refractory Molecular Species