Evolutionary view through the starless cores in Taurus

Context. The chemical and physical evolution of starless pre-stellar cores are paramount importance to understanding the process star formation. Taurus Molecular Cloud TMC 1-C 1-CP share similar initial conditions provide an excellent opportunity understand core phase. Aims. We investigated evolutionary stage based on observations towards prototypical dark 1-CP. Methods. mapped in CS 3 → 2, C 34 S 13 2 1, DCN 1 0, DNC DN N H + D 0 transitions. performed a multi-transitional study its isotopologs, DCN, lines characterize properties these cores. studied their chemistry using state-of-the-art gas-grain code AUTILUS pseudo time-dependent models determine stage. Results. central n volume density, column abundances deuterated species higher than 1-CP, yielding deuterium fraction 1-C, thus indicating later for 1-C. modeling with radiative transfer agreement this statement, allowing us estimate collapse timescale ~1 Myr Models younger scenario or slowed down by magnetic support found more closely reproduce Conclusions. Observational diagnostics seem indicate that is age Myr. shows signs being evolved at onset formation, while appears be earlier due recent formation or, alternatively, support.