An Ordered Envelope-disk Transition in the Massive Protostellar Source G339.88-1.26

Abstract

We report molecular line observations of the massive protostellar source G339.88-1.26 with the Atacama Large Millimeter/Submillimeter Array. The observations reveal a highly collimated SiO jet extending from the 1.3 mm continuum source, which connects to a slightly wider but still highly collimated CO outflow. Rotational features perpendicular to the outflow axis are detected in various molecular emissions, including SiO, SO2, H2S, CH3OH, and H2CO emissions. Based on their spatial distributions and kinematics, we find that they trace different parts of the envelope-disk system. The SiO emission traces the disk and inner envelope in addition to the jet. The CH3OH and H2CO emissions mostly trace the infalling-rotating envelope, and are enhanced around the transition region between envelope and disk, i.e., the centrifugal barrier. The SO2 and H2S emissions are enhanced around the centrifugal barrier, and also trace the outer part of the disk. Envelope kinematics are consistent with rotating-infalling motion, while those of the disk are consistent with Keplerian rotation. The radius and velocity of the centrifugal barrier are estimated to be about 530 au and 6 km/s, leading to a central mass of about 11 solar masses, consistent with estimates based on spectral energy distribution fitting. These results indicate that an ordered transition from an infalling-rotating envelope to a Keplerian disk through a centrifugal barrier, accompanied by changes of types of molecular line emissions, is a valid description of this massive protostellar source. This implies that at least some massive stars form in a similar way as low-mass stars via Core Accretion.

Accepted to ApJ

References in corpus (23)

• Which jet launching mechanism(s) in TTauri stars?
• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• Global Models for the Evolution of Embedded, Accreting Protostellar Disks
• Fragmentation of Massive Protostellar Disks
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• G11.92-0.61 MM1: A Keplerian disc around a massive young proto-O star
• L483: Warm Carbon-Chain Chemistry Source Harboring Hot Corino Activity
• ALMA Results of the Pseudodisk, Rotating disk, and Jet in Continuum and HCO+ in the Protostellar System HH 212
• A Keplerian disk around Orion Source I, a ~15 Msun YSO
• The Impact of Feedback During Massive Star Formation by Core Accretion
• The Remarkable Mid-Infrared Jet of Massive Young Stellar Object G35.20-0.74
• Molecular outflow launched beyond the disk edge
• Vertical Structure of the Transition Zone from Infalling Rotating Envelope to Disk in the Class 0 Protostar, IRAS04368+2557
• Chasing discs around O-type (proto)stars - ALMA evidence for an SiO disc and disc wind from G17.64+0.16
• Rotation in the NGC 1333 IRAS 4C Outflow
• Massive outflows associated with ATLASGAL clumps
• Radiation Transfer of Models of Massive Star Formation. IV. The Model Grid and Spectral Energy Distribution Fitting
• The search for high-mass protostars with ALMA revealed up to kilo-parsec scales (SPARKS): I. Indication for a centrifugal barrier in the environment of a single high-mass envelope
• ALMA reveals a candidate hot and compact disk around the O-type protostar IRAS 16547$-$4247
• First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259
• SiO Outflow Signatures Toward Massive Young Stellar Objects with Linearly Distributed Methanol Masers
• Evaporation of grain-surface species by shock waves in proto-planetary disk
• First VLBI observations of methanol maser polarisation, in G339.88-1.2

Cited by in corpus (25)

• Formation and Evolution of Disks around Young Stellar Objects
• Multi-directional mass-accretion and collimated outflows in W51
• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
• Chemistry and physics of a low-metallicity hot core in the Large Magellanic Cloud
• The SEDIGISM survey: a search for molecular outflows
• Importance of source structure on complex organics emission. I. Observations of CH${}_3$OH from low-mass to high-mass protostars
• The SOFIA Massive (SOMA) Star Formation Survey. II. High Luminosity Protostars
• A Detailed View of the Circumstellar Environment and Disk of the Forming O-star AFGL 4176
• Massive Protostars in a Protocluster -- A Multi-Scale ALMA View of G35.20-0.74N
• Importance of source structure on complex organics emission III. Effect of disks around massive protostars
• SiO Outflows as Tracers of Massive Star Formation in Infrared Dark Clouds
• Isolated Massive Star Formation in G28.20-0.05
• A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
• Vibrationally-excited Lines of HC${}_3$N Associated with the Molecular Disk around the G24.78+0.08 A1 Hyper-compact H${}_{\mathrm{II}}$ Region
• Disk Wind Feedback from High-mass Protostars. II. The Evolutionary Sequence
• Surveys of clumps, cores, and condensations in Cygnus-X: SMA observations of SiO (5$-$4)
• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
• An ALMA view of the Galactic super star cluster RCW38 at 270-AU resolution
• W49N MCN-a: a disk accreting massive protostar embedded in an early-phase hot molecular core
• A kinematic study of the disc-outflow system around a high-mass protostar G59.783+0.065 probed by methanol and water masers
• The SOFIA Massive (SOMA) Star Formation Q-band Follow-up. II. Hydrogen Recombination Lines Toward High-Mass Protostars
• Surveys of clumps, cores, and condensations in Cygnus-X: Searching for Keplerian disks on the scale of 500 au
• 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