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The characterization of dust properties in the interstellar medium (ISM) iskey for star formation. Mass estimates are crucial to determine gravitationalcollapse conditions for the birth of new stellar objects in molecular clouds.However, most of these estimates rely on dust models that need furtherobservational constraints from clouds to prestellar and protostellar cores. Wepresent results of a study of dust emissivity changes based on mm-continuumdata obtained with the NIKA camera at the IRAM-30m telescope. Observing dustemission at 1.15 mm and 2 mm allows us to constrain the dust emissivity index($\beta$) in the Rayleigh-Jeans tail of the dust spectral energy distribution(SED) far from its peak emission, where the contribution of other parameters(i.e. dust temperature) is important. Focusing on the Taurus molecular cloud, alow-mass star-forming regions in the Gould Belt, we analyze the emissionproperties of several distinct objects in the B213 filament: three prestellarcores, two Class-0/I protostellar cores and one Class-II object. By means ofthe ratio of the two NIKA channel-maps, we show that in the Rayleigh-Jeansapproximation the dust emissivity index varies among the objects. For oneprestellar and two protostellar cores, we produce a robust study using Herscheldata to constrain the dust temperature of the sources. By using the Abeltransform inversion technique we get accurate radial $\beta$ profiles. We findsystematic spatial variations of $\beta$ in the protostellar cores that is notobserved in the prestellar core. While in the former case $\beta$ decreasestoward the center, in the latter it remains constant. Moreover, $\beta$ appearsanticorrelated with the dust temperature. We discuss the implication of theseresults in terms of dust grain evolution between pre- and protostellar cores.

Probing changes of dust properties along a chain of solar-type prestellar and protostellar cores in Taurus with NIKA