Circumbinary Molecular Rings Around Young Stars in Orion

Abstract

We present high angular resolution 1.3 mm continuum, methyl cyanide molecular line, and 7 mm continuum observations made with the Submillimeter Array and the Very Large Array, toward the most highly obscured and southern part of the massive star forming region OMC1S located behind the Orion Nebula. We find two flattened and rotating molecular structures with sizes of a few hundred astronomical units suggestive of circumbinary molecular rings produced by the presence of two stars with very compact circumstellar disks with sizes and separations of about 50 AU, associated with the young stellar objects 139-409 and 134-411. Furthermore, these two circumbinary rotating rings are related to two compact and bright {\it hot molecular cores}. The dynamic mass of the binary systems obtained from our data are $\ge$ 4 M${}_{\odot }$ for 139-409 and $\ge$ 0.5 M${}_{\odot }$ for 134-411. This result supports the idea that intermediate-mass stars will form through {\it circumstellar disks} and jets/outflows, as the low mass stars do. Furthermore, when intermediate-mass stars are in multiple systems they seem to form a circumbinary ring similar to those seen in young, multiple low-mass systems (e.g., GG Tau and UY Aur).

Accepted by Astronomy and Astrophysics

References in corpus (11)

• The Submillimeter Array
• On the Formation of Massive Stars
• Massive star formation in 100,000 years from turbulent and pressurized molecular clouds
• A detailed study of the rotating toroids in G31.41+0.31 and G24.78+0.08
• Observations on the Formation of Massive Stars by Accretion
• Infall Collapse Solutions in the Inner Limit: Radiation Pressure and its Effects on Star Formation
• Massive Protoplanetary Disks in the Trapezium Region
• Compact Radio Sources in Orion: New Detections, Time Variability, and Objects in OMC-1S
• A Cluster of 1.3 cm Continuum Sources in OMC1 South
• An Infalling Torus of Molecular Gas Around the Ultra-Compact HII Region G28.20-0.05
• Compact Centimeter and Millimeter Sources in NGC 6334 I(N): OB Stars in the Making?

Cited by in corpus (14)

• Accretion disks in luminous young stellar objects
• Proplyds and Massive Disks in the Orion Nebula Cluster Imaged with CARMA and SMA
• Orion KL: The hot core that is not a "Hot Core"
• Hierarchical Fragmentation of the Orion Molecular Filaments
• Tearing the Veil: interaction of the Orion Nebula with its neutral environment
• Thermal Jeans fragmentation within 1000 AU in OMC-1S
• Implications of a hot atmosphere/corino from ALMA observations towards NGC1333 IRAS 4A1
• A rotating molecular jet in Orion
• Rotating Bullets from A Variable Protostar
• The SOFIA Massive (SOMA) Star Formation Survey. III. From Intermediate- to High-Mass Protostars
• X-ray embedded stars as driving sources of outflow-driven turbulence in OMC1-S
• ALMA observations of the archetypal "hot core" that isn't: Orion KL
• Massive Prestellar Cores in Radiation-magneto-turbulent Simulations of Molecular Clouds
• A contracting circumbinary molecular ring with an inner cavity of about 140 AU around Ori 139-409