Kavli Affiliate: Gregory J. Herczeg
| First 5 Authors: Jae-Hong Jeong, Jeong-Eun Lee, Seonjae Lee, Giseon Baek, Ji-Hyun Kang
| Summary:
We present an investigation of Complex Organic Molecules (COMs) in the
spatially resolved Keplerian disk around V883 Ori, an eruptive young star,
based on a spectral survey carried out with ALMA in Band 6 (220.7$-$274.9 GHz).
We identified about 3,700 molecular emission lines and discovered 23 COMs in
the disk. We estimated the column densities of COMs detected through the
iterative LTE line fitting method. According to our analyses, using only
optically thin lines is critical to deriving the reliable column densities of
COMs. Therefore, covering a large frequency range is important for the studies
of COMs. The most distinct phenomenon found from the spectra of the V883 Ori
disk is that nitrogen-bearing COMs other than CH$_{3}$CN are missing, whereas
various oxygen-bearing COMs, except for the CH$_2$OH-bearing molecules, are
detected. The missing CH$_2$OH-bearing COMs may indicate the warm water-ice
dominant environment for forming COMs. We compared our results with various
objects in different evolutionary stages, from Class 0 hot corinos to a Solar
System comet 67P/Churyumov-Gerasimenko, to examine the effect of evolution on
the COM compositions. In general, the COMs abundances relative to methanol in
V883 Ori are higher than in the hot corinos and hot cores, while they are
comparable to the cometary values. This may indicate the planet-forming
material chemically evolves in the disk midplane after being accreted from the
envelope. In addition, as found in the comet 67P/Churyumov-Gerasimenko,
nitrogen might also be trapped as ammonium salt within the dust grains in the
V883 Ori disk.
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