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Within the project Evolution of Chemistry in the envelope of HOt corinoS(ECHOS), we present a study of sulphur chemistry in the envelope of the Class 0source B335 through observations in the spectral range 7, 3, and 2 mm. We havemodelled observations assuming LTE and LVG approximation. We have also used thecode Nautilus to study the time evolution of sulphur species. We have detected20 sulphur species with a total gas-phase S abundance similar to that found inthe envelopes of other Class 0 objects, but with significant differences in theabundances between sulphur carbon chains and sulphur molecules containingoxygen and nitrogen. Our results highlight the nature of B335 as a sourceespecially rich in sulphur carbon chains unlike other Class 0 sources. The lowpresence or absence of some molecules, such as SO and SO+, suggests a chemistrynot particularly influenced by shocks. We, however, detect a large presence ofHCS+ that, together with the low rotational temperatures obtained for all the Sspecies (<15 K), reveals the moderate or low density of the envelope of B335.We also find that observations are better reproduced by models with a sulphurdepletion factor of 10 with respect to the sulphur cosmic elemental abundance.The comparison between our model and observational results for B335 reveals anage of 10$^4$$<$t$<$10$^5$ yr, which highlights the particularly earlyevolutionary stage of this source. B335 presents a different chemistry comparedto other young protostars that have formed in dense molecular clouds, whichcould be the result of accretion of surrounding material from the diffuse cloudonto the protostellar envelope of B335. In addition, the analysis of theSO2/C2S, SO/CS, and HCS+/CS ratios within a sample of prestellar cores andClass 0 objects show that they could be used as good chemical evolutionaryindicators of the prestellar to protostellar transition.

Evolution of Chemistry in the envelope of Hot Corinos (ECHOS). I. Extremely young sulphur chemistry in the isolated Class 0 object B335