Seeds of Life in Space (SOLIS)

Context. The isotopic ratio of nitrogen presents a wide range values in the Solar System: from ~140 meteorites and comets to 441 solar wind. In star-forming systems, we observe even higher spread ~150–1000. origin these differences is still unclear. Aims. Chemical reactions gas phase are one possible processes that could modify 14 N/ 15 N ratio. We aim investigate if how passage shock wave interstellar medium, which activates rich chemistry, can affect relative fraction isotopes. ideal place for such study chemically outflow powered by L1157-mm protostar, where several shocked clumps present. Methods. present first measurement two clumps, B1 B0, protostellar L1157. derived interferometeric maps H 13 CN (1–0) HC lines obtained with NOrthern Extended Millimeter Array (NOEMA) interferometer as part Seeds Life Space (SOLIS) programme. Results. B1, find emission traces front clump, apex region, fast jet impacts lower velocity medium an averaged column density (H CN) ~ 7 × 10 12 cm −2 (HC N) 2 . this (1–0)/HC almost uniform average value ~5 ± 1. same also measured smaller clump B0e. Assuming standard C/ C = 68, obtain 340 70. This similar those usually found species prestellar cores protostars. analysed prediction chemical model conditions carbon fractionations do not vary much period after shock. observed CN/HC be reproduced non-dissociative, C-type pre-shock n (H) 5 −3 , V s between 20 40 km −1 cosmic-ray ionization rate 3 −16 ; agrees previous modelling other L1157-B1. Conclusions. Both observations models indicate chemistry activated propagation does ratio, remains temperature envelopes.