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Complex organic molecules (COMs) in protoplanetary disks are key tounderstanding the origin of volatiles in comets in our solar system, yet thechemistry of COMs in protoplanetary disks remains poorly understood. Here wepresent Atacama Large Millimeter/submillimeter Array (ALMA) Band 3 observationsof the disk around the young outbursting star V883 Ori, where the COMssublimate from ices and are thus observable thanks to the warm condition of thedisk. We have robustly identified ten oxygen-bearing COMs including$^{13}$C-isotopologues in the disk-integrated spectra. The radial distributionsof the COM emission, revealed by the detailed analyses of the line profiles,show the inner emission cavity, similar to the previous observations in Band 6and Band 7. We found that the COMs abundance ratios with respect to methanolare significantly higher than those in the warm protostellar envelopes of IRAS16293-2422 and similar to the ratios in the solar system comet67P/Churyumov-Gerasimenko, suggesting the efficient (re-)formation of COMs inprotoplanetary disks. We also constrained the $^{12}$C/$^{13}$C and D/H ratiosof COMs in protoplanetary disks for the first time. The $^{12}$C/$^{13}$Cratios of acetaldehyde, methyl formate, and dimethyl ether are consistentlylower ($\sim$ 20-30) than the canonical ratio in the interstellar medium($\sim$ 69), indicating the efficient $^{13}$C-fractionation of CO. The D/Hratios of methyl formate are slightly lower than the values in IRAS 16293-2422,possibly pointing to the destruction and reformation of COMs in disks. We alsodiscuss the implications for nitrogen and sulfur chemistry in protoplanetarydisks.

Chemistry of Complex Organic Molecules in the V883 Ori Disk Revealed by ALMA Band 3 Observations