Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks

Abstract

We report results of 0.05"-resolution observations toward the O-type proto-binary system IRAS 16547-4247 with the Atacama Large Millimeter/submillimeter Array (ALMA). We present dynamical and chemical structures of the circumbinary disk, circumstellar disks, outflows and jets, illustrated by multi-wavelength continuum and various molecular lines. In particular, we detect sodium chloride, silicon compounds, and vibrationally-excited water lines as probes of the individual protostellar disks at a scale of 100 au. These are complementary to typical hot-core molecules tracing the circumbinary structures on a 1000-au scale. The H2O line tracing inner-disks has an upper-state energy of Eu/k>3000K, indicating a high temperature of the disks. On the other hand, despite the detected transitions of NaCl, SiO, and SiS not necessarily having high upper-state energies, they are enhanced only in the vicinity of the protostars. We interpret that these molecules are the products of dust destruction, which only happens in the inner disks. This is the second detection of alkali metal halide in protostellar systems after the case of the disk of Orion Source I, and also one of few massive protostellar disks associated with high-energy transition water and silicon compounds. These new results suggest these "hot-disk" lines may be common in innermost disks around massive protostars, and have great potential for future research of massive star formation. We also tentatively find that the twin disks are counter-rotating, which might give a hint of the origin of the massive proto-binary system IRAS 16547-4247.

arXiv comment15 pages, 5 figures, 2 appendix figures. Published in ApJ Letters

References in corpus (44)

• The Formation of Massive Star Systems by Accretion
• Stellar, brown dwarf and multiple star properties from a radiation hydrodynamical simulation of star cluster formation
• Evolution of Massive Protostars with High Accretion Rates
• Circumventing the radiation pressure barrier in the formation of massive stars via disk accretion
• The Formation of Low-Mass Binary Star Systems Via Turbulent Fragmentation
• The RMS Survey: Critical Tests of Accretion Models for the Formation of Massive Stars
• The physical and chemical structure of Sagittarius B2, I. Three-dimensional thermal dust and free-free continuum modeling on 100 au to 45 pc scales
• On the existence of accretion-driven bursts in massive star formation
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• Radio Jets from Young Stellar Objects
• A Keplerian-like disk around the forming O-type star AFGL 4176
• An Unstable Truth: How Massive Stars get their Mass
• First hydrodynamics simulations of radiation forces and photoionization feedback in massive star formation
• The Early Evolution of Massive Stars: Radio Recombination Line Spectra
• The Turbulent Origin of Outflow and Spin Misalignment in Multiple Star Systems
• Forming spectroscopic massive proto-binaries by disk fragmentation
• A Keplerian disk around Orion Source I, a ~15 Msun YSO
• Outflow-Confined H II Regions. I. First Signposts of Massive Star Formation
• Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
• The Impact of Feedback During Massive Star Formation by Core Accretion
• The Bridge: a transient phenomenon of forming stellar multiples
• High Angular Resolution Observations of the Collimated Jet Source Associated with a Massive Protostar in IRAS 16547-4247
• Massive Outflows Driven by Magnetic Effects in Star Forming Clouds with High Mass Accretion Rates
• Chasing discs around O-type (proto)stars - ALMA evidence for an SiO disc and disc wind from G17.64+0.16
• The Role of Outflows, Radiation Pressure, and Magnetic Fields in Massive Star Formation
• The Collimated Jet Source in IRAS 16547-4247: Time Variation, Possible Precession, and Upper Limits to the Proper Motions Along the Jet Axis
• Spiral arms and instability within the AFGL 4176 mm1 disc
• Massive star formation by accretion I. Disc accretion
• Fragmentation and disk formation in high-mass star formation: The ALMA view of G351.77-0.54 at 0.06" resolution
• Hot Molecular Circumstellar Disk around Massive Protostar Orion Source I
• An Ordered Envelope-disk Transition in the Massive Protostellar Source G339.88-1.26
• An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS16547$-$4247
• ALMA reveals a candidate hot and compact disk around the O-type protostar IRAS 16547$-$4247
• Orion Source I's disk is salty
• The first bird's-eye view of a gravitationally unstable accretion disk in high-mass star formation
• The Rotating Molecular Structures and the Ionized Outflow Associated with IRAS 16547-4247
• Dynamics of a Massive Binary at Birth
• The first detection of the 232 GHz vibrationally excited H2O maser in Orion KL with ALMA
• Discovery of a Photoionized Bipolar Outflow towards the Massive Protostar G45.47+0.05
• Twin Jets and Close Binary Formation
• IRAS16547-4247: A New Candidate of a Protocluster Unveiled with ALMA
• The SOMA Radio Survey. I. Comprehensive SEDs Of High-Mass Protostars From Infrared To Radio And The Emergence Of Ionization Feedback
• Observations of Orion Source I Disk and Outflow Interface
• Disks around O-type young stellar objects

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• First spatially resolved Na I and He I transitions towards an MYSO. Finding new tracers for the gaseous star/disc interface
• HOTDISK. Finding Massive Protostellar Disks with Water and Refractory Molecular Species
• A new formation scenario of a counter-rotating circumstellar disk: spiral-arm accretion from a circumbinary disk in a triple protostar system
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