A new look at sulphur chemistry in hot cores and corinos
  Sulphur-bearing species are often used to probe the evolution of hot cores
since their abundances are particularly sensitive to physical and chemical
variations. However, the chemistry of sulphur is not well understood in these
regions, notably because observations of several hot cores displayed a large
variety of sulphur compositions, and because the reservoir of sulphur in dense
clouds, in which hot cores form, is still poorly constrained. In order to help
disentangled its complexity, we present a fresh comprehensive review of sulphur
chemistry in hot cores along with a study of its sensibility to temperature and
pre-collapse chemical composition. In parallel, we analyse the discrepencies
that result from the use of two different types of models (static and dynamic)
to highlight the sensitivity to the choice of model to be used in astrochemical
studies. Our results show that the pre-collapse chemical composition is a
critical parameter for sulphur chemistry in hot cores and could explain the
different sulphur compositions observed. We also report that differences in
abundances for a given species between the static and dynamic models can reach
six orders of magnitude in the hot core, which reveals the key role of the
choice of model in astrochemical studies.
