Digging into the Interior of Hot Cores with ALMA (DIHCA). II. Exploring the Inner Binary (Multiple) System Embedded in G335 MM1 ALMA1

Abstract

We observed the high-mass protostellar core G335.579-0.272 ALMA1 at $\sim 200$ au (0.05") resolution with the Atacama Large Millimeter/submillimeter Array (ALMA) at 226 GHz (with a mass sensitivity of $5\sigma =0.2$ M${}_{\odot }$ at 10 K). We discovered that at least a binary system is forming inside this region, with an additional nearby bow-like structure ($\lesssim 1000$ au) that could add an additional member to the stellar system. These three sources are located at the center of the gravitational potential well of the ALMA1 region and the larger MM1 cluster. The emission from CH${}_3$OH (and many other tracers) is extended ($>1000$ au), revealing a common envelope toward the binary system. We use CH${}_2$CHCN line emission to estimate an inclination angle of the rotation axis of $26^{\circ }$ with respect to the line of sight based on geometric assumptions and derive a kinematic mass of the primary source (protostar+disk) of 3.0 M${}_{\odot }$ within a radius of 230 au. Using SiO emission, we find that the primary source drives the large scale outflow revealed by previous observations. Precession of the binary system likely produces a change in orientation between the outflow at small scales observed here and large scales observed in previous works. The bow structure may have originated by entrainment of matter into the envelope due to widening or precession of the outflow, or, alternatively, an accretion streamer dominated by the gravity of the central sources. An additional third source, forming due to instabilities in the streamer, cannot be ruled out as a temperature gradient is needed to produce the observed absorption spectra.

23 pages, 16 figures, 4 tables, 2 appendices. Accepted for publication in ApJ

References in corpus (23)

• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores
• Herschel observations of EXtra-Ordinary Sources: Analysis of the HIFI 1.2 THz Wide Spectral Survey Toward Orion KL I. Methods
• Gravity Driven Magnetic Field at ~1000 au Scales in High-mass Star Formation
• Forming spectroscopic massive proto-binaries by disk fragmentation
• Substructures in the Keplerian disc around the O-type (proto)star G17.64+0.16
• Laboratory Characterization and Astrophysical Detection of Vibrationally Excited States of Vinyl Cyanide in Orion-KL
• Protostellar Outflows and Radiative Feedback from Massive Stars
• Spiral arms and instability within the AFGL 4176 mm1 disc
• Collapse of turbulent massive cores with ambipolar diffusion and hybrid radiative transfer I. Accretion and multiplicity
• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• Digging into the Interior of Hot Cores with ALMA (DIHCA). I. Dissecting the High-mass Star-Forming Core G335.579-0.292 MM1
• Disk Kinematics and Stability in High-Mass Star Formation: Linking Simulations and Observations
• A Galactic survey of radio jets from massive protostars
• Dynamics of a Massive Binary at Birth
• A Detailed View of the Circumstellar Environment and Disk of the Forming O-star AFGL 4176
• Continuity of accretion from clumps to Class 0 high-mass protostars in SDC335
• Interferometric Observations of High-Mass Star-Forming Clumps with Unusual N2H+/HCO+ Line Ratios
• Tightening the belt: Constraining the mass and evolution in SDC335
• The sharp ALMA view of infall and outflow in the massive protocluster G31.41+0.31
• Analysis and test of the central-blue-spot infall hallmark
• Multi-wavelength modelling of the circumstellar environment of the massive proto-star AFGL 2591 VLA 3
• Turbulence and its connection to episodic accretion in binary YSOs

Cited by in corpus (9)

• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XV. Steady Accretion from Global Collapse to Core Feeding in Massive Hub-filament System SDC335
• Direct observational evidence of the multi-scale, dynamical mass accretion toward a high-mass star forming hub-filament system
• ALMA-IMF XV: The core mass function in the high-mass star-formation regime
• Digging into the Interior of Hot Cores with ALMA (DIHCA). III: The Chemical Link between NH${}_2$CHO, HNCO, and H${}_2$CO
• Salt-bearing disk candidates around high-mass young stellar objects
• Massive Prestellar Cores in Radiation-magneto-turbulent Simulations of Molecular Clouds
• ALMA-IMF XVII -- Census and lifetime of high-mass prestellar cores in 14 massive protoclusters
• Digging into the Interior of Hot Cores with ALMA (DIHCA). V. Deuterium Fractionation of Methanol
• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall