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We present an overview and first results from the Spectroscopic Ultradeep Survey Probing Extragalactic Near-infrared Stellar Emission (SUSPENSE), executed with NIRSpec on JWST. The primary goal of the SUSPENSE program is to characterize the stellar, chemical, and kinematic properties of massive quiescent galaxies at cosmic noon. In a single deep NIRSpec/MSA configuration, we target 20 distant quiescent galaxy candidates (z=1-3, H₀₁1. 75 z<1. 75 galaxies formed 50% of their stellar mass before z=4 z=3. Furthermore, the typical SFHs of galaxies in these two redshift bins (z₌₄₀₍=2. 2 and z₌₄₀₍=1. 3) indicate that galaxies at higher redshift formed earlier and over shorter star-formation timescales compared to lower redshifts. Although this evolution is naturally explained by the growth of the quiescent galaxy population over cosmic time, we cannot rule out that mergers and late-time star formation also contribute to the evolution. In future work, we will further unravel the early formation, quenching, and late-time evolution of these galaxies by extending this work with studies on their chemical abundances,
Slob et al. (Thu,) studied this question.