Observations of Orion Source I Disk and Outflow Interface

Abstract

We imaged the continuum and molecular line emission from Orion Source I (SrcI) with up to 30 mas (12 AU) resolution at 43, 99, 223, and 340 GHz in an attempt to probe the structure and chemistry of the circumstellar disk and bipolar outflow associated with this high mass protostar. The continuum spectral index ranges from $\sim$2 along the midplane of the disk to $\sim$3 along the edges, consistent with dust that is optically thick in the midplane but becomes optically thin at the periphery. Salt (NaCl) emission is visible where the dust is optically thin; it provides a unique tracer of the velocity field within the disk. All other molecules that we have mapped - H${}_2$O, AlO, SiO, SiS, SO, and SO${}_2$ - appear to originate primarily in the bipolar outflow. The base of the outflow is corotating with the disk. SiS shows a filamentary structure that is most prominent along the edges of the outflow. The molecular distributions suggest that Si and Al released from dust grains in the disk react with oxygen derived from H${}_2$O to form SiO and AlO, and with SO and SO${}_2$ to form SiS.

Accepted in the Astrophysical Journal. 18 pages, 17 figures

References in corpus (26)

• The distance to the Orion Nebula
• The APOGEE-2 Survey of the Orion Star Forming Complex II: Six-dimensional structure
• Disk-Driven Rotating Bipolar Outflow in Orion Source I
• A Feature Movie of SiO Emission 20-100 AU from the Massive Young Stellar Object Orion Source I
• Proper Motions of the BN Object and the I Radio Source in Orion: Where and When Did BN Become a Runaway Star?
• Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
• The ALMA View of the OMC1 Explosion in Orion
• A Multi-Epoch Study of the Radio Continuum Emission of Orion Source I: Constraints on the Disk Evolution of a Massive YSO and the Dynamical History of Orion BN/KL
• Tracing the Bipolar Outflow from Orion Source I
• A Keplerian disk around Orion Source I, a ~15 Msun YSO
• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• Unveiling Sources of Heating in the Vicinity of the Orion BN/KL Hot Core as Traced by Highly Excited Inversion Transitions of Ammonia
• Silicon-bearing molecules in the shock L1157-B1: first detection of SiS around a Sun-like protostar
• Maser emission from SiO isotopologues traces the innermost 100 AU around Radio Source I in Orion BN/KL
• Hot Molecular Circumstellar Disk around Massive Protostar Orion Source I
• ALMA Observations of Orion Source I at 350 and 660 GHz
• Dynamical Evidence for a Magnetocentrifugal Wind from a 20 Msun Binary Young Stellar Object
• Orion Source I's disk is salty
• OH maser disc and outflow in the Orion-BN/KL region
• Formation and destruction of SiS in space
• ALMA Images of the Orion Hot Core at 349 GHz
• VLBA imaging of the 3mm SiO maser emission in the disk-wind from the massive protostellar system Orion Source I
• Outflow Structure and Velocity Field of Orion Source I: ALMA Imaging of SiO Isotopologue Maser and Thermal Emission
• Circumbinary disc survival during binary-single scattering: towards a dynamical model of the Orion BN/KL complex
• MHD Modeling of a Disk-Wind from a High-Mass Protobinary: the case of Orion Source I
• Extremely high excitation SiO lines in disk-outflow system in Orion Source I

Cited by in corpus (10)

• Salt, Hot Water, and Silicon Compounds Tracing Massive Twin Disks
• OMC-1 dust polarisation in ALMA Band 7: Diagnosing grain alignment mechanisms in the vicinity of Orion Source I
• The mid-infrared molecular inventory towards Orion IRc2
• Magnetic Field Structure of Orion Source I
• Mapping physical parameters in Orion KL at high spatial resolution
• Structure of the Source I disk in Orion-KL
• On the Relationship between CH${}_3$OD Abundance and Temperature in the Orion KL Nebula
• 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
• An ionized outflow in Orion-KL source I?
• Metallic species in interstellar medium: Astrochemical modeling