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Outflows and winds launched from young stars play a crucial role in theevolution of protostars and the early stages of planet formation. However, thespecific details of the mechanism behind these phenomena, including how theyaffect the protoplanetary disk structure, are still debated. We present {\itJWST} NIRSpec Integral Field Unit (IFU) observations of atomic and H$_2$ linesfrom 1 -- 5.1 $\mu$m toward the low-mass protostar TMC1A. For the first time, acollimated atomic jet is detected from TMC1A in the [Fe II] line at 1.644$\mu$m along with corresponding extended H$_2$ 2.12 $\mu$m emission. Towardsthe protostar, we detected spectrally broad H I and He I emissions withvelocities up to 300 km/s that can be explained by a combination ofprotostellar accretion and a wide-angle wind. The 2$\mu$m continuum dustemission, H I, He I, and O I all show emission from the illuminated outflowcavity wall and scattered line emission. These observations demonstrate thepotential of {\it JWST} to characterize and reveal new information about thehot inner regions of nearby protostars. In this case, a previously undetectedatomic wind and ionized jet in a well-known outflow.

JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region