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We report on subarcsecond observations of complex organic molecules (COMs) inthe high-mass protostar IRAS20126+4104 with the Plateau de Bure Interferometerin its most extended configurations. In addition to the simple molecules SO,HNCO and H2-13CO, we detect emission from CH3CN, CH3OH, HCOOH, HCOOCH3,CH3OCH3, CH3CH2CN, CH3COCH3, NH2CN, and (CH2OH)2. SO and HNCO present aX-shaped morphology consistent with tracing the outflow cavity walls. Most ofthe COMs have their peak emission at the putative position of the protostar,but also show an extension towards the south(east), coinciding with an H2 knotfrom the jet at about 800-1000 au from the protostar. This is especially clearin the case of H2-13CO and CH3OCH3. We fitted the spectra at representativepositions for the disc and the outflow, and found that the abundances of mostCOMs are comparable at both positions, suggesting that COMs are enhanced inshocks as a result of the passage of the outflow. By coupling a parametricshock model to a large gas-grain chemical network including COMs, we find thatthe observed COMs should survive in the gas phase for about 2000 yr, comparableto the shock lifetime estimated from the water masers at the outflow position.Overall, our data indicate that COMs in IRAS20126+4104 may arise not only fromthe disc, but also from dense and hot regions associated with the outflow.

Complex Organic Molecules tracing shocks along the outflow cavity in the high-mass protostar IRAS20126+4104