Extremely high excitation SiO lines in disk-outflow system in Orion Source I

Abstract

We present high-resolution images of the submillimeter SiO line emissions of a massive young stellar object Orion Source I using the Atacama Large Millimeter/ Submillimeter Array (ALMA) at band 8. We detected the 464 GHz SiO v=4 J=11-10 line in Source I, which is the first detection of the SiO v=4 line in star-forming regions, together with the 465 GHz 29SiO v=2 J=11-10 and the 428 GHz SiO v=2 J=10-9 lines with a resolution of 50 AU. The 29SiO v=2 J=11-10 and SiO v=4 J=11-10 lines have compact structures with the diameter of <80 AU. The spatial and velocity distribution suggest that the line emissions are associated with the base of the outflow and the surface of the edge-on disk. In contrast, SiO v=2 J=10-9 emission shows a bipolar structure in the direction of northeast-southwest low-velocity outflow with ~200 AU scale. The emission line exhibits a velocity gradient along the direction of the disk elongation. With the assumption of the ring structure with Keplerian rotation, we estimated the lower limit of the central mass to be 7 solar mass and the radius of 12 AU< r <26 AU.

13 pages, 4 figures, accepted for publication in ApJ

References in corpus (12)

• The distance to the Orion Nebula
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• The close circumstellar environment of Betelgeuse - V. Rotation velocity and molecular envelope properties from ALMA
• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• ALMA Observations of Orion Source I at 350 and 660 GHz
• The Proper Motions of the Double Radio Source n in the Orion BN/KL Region
• New Evidence for the Dynamical Decay of a Multiple System in the Orion Kleinmann-Low Nebula
• ALMA Imaging of Millimeter/Submillimeter Continuum Emission in Orion KL
• VLBA imaging of the 3mm SiO maser emission in the disk-wind from the massive protostellar system Orion Source I
• A study of dynamical processes in the Orion KL region using ALMA-- Probing molecular outflow and inflow
• ALMA observations of the archetypal "hot core" that isn't: Orion KL
• ALMA band 8 continuum emission from Orion Source I

Cited by in corpus (5)

• Formation and Evolution of Disks around Young Stellar Objects
• The Orion Protostellar Explosion and Runaway Stars Revisited: Stellar Masses, Disk Retention, and an Outflow from BN
• SiO, 29SiO, and 30SiO emission from 67 oxygen-rich stars. A survey of 61 maser lines from 7 to 1 mm
• Observations of Orion Source I Disk and Outflow Interface
• Magnetic Field Structure of Orion Source I