# Sulfur Chemistry in L1157-B1

## TL;DR

This study investigates sulfur-bearing molecules in the shocked region L1157-B1, revealing their abundances, physical conditions, and contribution to cosmic sulfur, enhancing understanding of sulfur chemistry in star-forming regions.

## Contribution

It provides a comprehensive observational analysis of multiple sulfur species in L1157-B1, quantifying their abundances and gas conditions, which was previously not well characterized.

## Key findings

- Sulfur-bearing species account for 10% of cosmic sulfur in L1157-B1.
- Multiple sulfur molecules trace diverse gas conditions.
- The study offers detailed column densities and fractional abundances.

## Abstract

The main carrier of sulfur in dense clouds, where it is depleted from the gas phase, remains a mystery. Shock waves in young molecular outflows disrupt the ice mantles and allow us to directly probe the material that is ejected into the gas phase. A comprehensive study of sulfur-bearing species towards L1157-B1, a shocked region along a protostellar outflow, has been carried out as part of the IRAM-30m large program ASAI. The dataset contains over 100 lines of CCS, H$_2$CS, OCS, SO, SO$_2$ and isotopologues. The results of these observations are presented, complementing previous studies of sulfur-bearing species in the region. The column densities and fractional abundances of these species are measured and together these species account for 10\% of the cosmic sulfur abundance in the region. The gas properties derived from the observations are also presented, demonstrating that sulfur bearing species trace a wide range of different gas conditions in the region.