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• W3100671821 abstract "Aims. The physical structure of a shock wave may take a form unique to its shock type, implying that the chemistry of each shock type is unique as well. We aim to investigate the different chemistries of J-type and C-type shocks in order to identify unique molecular tracers of both shock types. We apply these diagnostics to the protostellar outflow L1157 to establish whether the B2 clump could host shocks exhibiting type-specific behaviour. Of particular interest is the L1157-B2 clump, which has been shown to exhibit bright emission in S-bearing species and HNCO. Methods. We simulate, using a parameterised approach, a planar, steady-state J-type shock wave using UCLCHEM. We compute a grid of models using both C-type and J-type shock models to determine the chemical abundance of shock-tracing species as a function of distance through the shock and apply it to the L1157 outflow. We focus on known shock-tracing molecules such as H 2 O, HCN, and CH 3 OH. Results. We find that a range of molecules including H 2 O and HCN have unique behaviour specific to a J-type shock, but that such differences in behaviour are only evident at low v s and low n H . We find that CH 3 OH is enhanced by shocks and is a reliable probe of the pre-shock gas density. However, we find no difference between its gas-phase abundance in C-type and J-type shocks. Finally, from our application to L1157, we find that the fractional abundances within the B2 region are consistent with both C-type and J-type shock emission." @default.
• W3100671821 created "2020-11-23" @default.
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• W3100671821 date "2020-01-29" @default.
• W3100671821 modified "2023-10-18" @default.
• W3100671821 title "Tracing shock type with chemical diagnostics" @default.
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• W3100671821 doi "https://doi.org/10.1051/0004-6361/201936536" @default.
• W3100671821 hasPublicationYear "2020" @default.
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