A Chemical Map of the Outbursting V883 Ori system: Vertical and Radial Structures

Abstract

We present the first results of a pilot program to conduct an Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 (211-275 GHz) spectral line study of young stellar objects (YSO) that are undergoing rapid accretion episodes, i.e. FU Ori objects (FUors). Here, we report on molecular emission line observations of the FUor system, V883 Ori. In order to image the FUor object with full coverage from ~0.5 arcsec to the map size of ~30 arcsec, i.e. from disc to outflow scales, we combine the ALMA main array (the 12-m array) with the Atacama Compact Array (7-m array) and the total power (TP) array. We detect HCN, HCO${}^{+}$, CH${}_3$OH, SO, DCN, and H${}_2$CO emissions with most of these lines displaying complex kinematics. From PV diagrams, the detected molecules HCN, HCO${}^{+}$, CH${}_3$OH, DCN, SO, and H${}_2$CO probe a Keplerian rotating disc in a direction perpendicular to the large-scale outflow detected previously with the ${}^{12}$CO and ${}^{13}$CO lines. Additionally, HCN and HCO${}^{+}$ reveal kinematic signatures of infall motion. The north outflow is seen in HCO${}^{+}$, H${}_2$CO, and SO emissions. Interestingly, HCO${}^{+}$ emission reveals a pronounced inner depression or "hole" with a size comparable to the radial extension estimated for the CH${}_3$OH and 230 GHz continuum. The inner depression in the integrated HCO${}^{+}$ intensity distribution of V883 Ori is most likely the result of optical depth effects, wherein the optically thick nature of the HCO${}^{+}$ and continuum emission towards the innermost parts of V883 Ori can result in a continuum subtraction artifact in the final HCO${}^{+}$ flux level.

References in corpus (37)

• An atomic and molecular database for analysis of submillimetre line observations
• The distance to the Orion Nebula
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• Dust and Gas in the disc of HL Tauri: Surface density, dust settling, and dust-to-gas ratio
• The great dichotomy of the Solar System: small terrestrial embryos and massive giant planet cores
• LIME - a flexible, non-LTE line excitation and radiation transfer method for millimeter and far-infrared wavelengths
• Imaging the water-snow line during a protostellar outburst
• Chemical Processes in Protoplanetary Disks
• Dust masses of young disks: constraining the initial solid reservoir for planet formation
• High-resolution simulations of the final assembly of Earth-like planets 2: water delivery and planetary habitability
• The ice composition in the disk around V883 Ori revealed by its stellar outburst
• A recent accretion burst in the low-mass protostar IRAS 15398-3359: ALMA imaging of its related chemistry
• The impact of shocks on the chemistry of molecular clouds: high resolution images of chemical differentiation along the NGC1333-IRAS2A outflow
• Episodic Accretion in Young Stars
• The chemistry of multiply deuterated molecules in protoplanetary disks. I. The outer disk
• A Close-up View of the Young Circumbinary Disk HD 142527
• AUTO-MULTITHRESH: A General Purpose Automasking Algorithm
• Complex Structure in Class 0 Protostellar Envelopes III: Velocity Gradients in Non-Axisymmetric Envelopes, Infall or Rotation?
• Methanol and its relation to the water snowline in the disk around the young outbursting star V883 Ori
• Empirical Temperature Measurement in Protoplanetary Disks
• The Distribution and Chemistry of H${}_2$CO in the DM Tau Protoplanetary Disk
• Stacking Spectra in Protoplanetary Disks: Detecting Intensity Profiles from Hidden Molecular Lines in HD 163296
• Variable H${}^{13}$CO${}^{+}$ Emission in the IM Lup Disk: X-ray Driven Time-Dependent Chemistry?
• Chemical Signatures of the FU Ori Outbursts
• The chemistry of episodic accretion in embedded objects. 2D radiation thermo-chemical models of the post-burst phase
• Chemically tracing the water snowline in protoplanetary disks with HCO${}^{+}$
• The Discovery of Two FU Orionis Objects in L1641
• Modeling C-Shock Chemistry in Isolated Molecular Outflows
• The ALMA Early Science View of FUor/EXor objects. II. The Very Wide Outflow Driven by HBC 494
• What pebbles are made of: Interpretation of the V883 Ori disk
• The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori
• Complex organic molecules along the accretion flow in isolated and externally irradiated protoplanetary disks
• The ALMA Early Science View of FUor/EXor objects. IV. Misaligned Outflows in the Complex Star-forming Environment of V1647 Ori and McNeil's Nebula
• Total Power Map to Visibilities (TP2VIS): Joint Deconvolution of ALMA 12m, 7m, and Total Power Array Data
• A Comparison of the X-ray Properties of FU Ori-type Stars to Generic Young Stellar Objects
• Making Terrestrial Planets: High Temperatures, FU Orionis Outbursts, Earth, and Planetary System Architectures
• Imaging the water snowline around protostars with water and HCO${}^{+}$ isotopologues

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