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We present results on the structural properties of massive passive galaxiesin three clusters at $1.39<z<1.61$ from the KMOS Cluster Survey. We measurelight-weighted and mass-weighted sizes from optical and near-infrared HubbleSpace Telescope imaging and spatially resolved stellar mass maps. Therest-frame $R$-band sizes of these galaxies are a factor of $\sim2-3$ smallerthan their local counterparts. The slopes of the relation between the stellarmass and the light-weighted size are consistent with recent studies in clustersand the field. Their mass-weighted sizes are smaller than the rest frame$R$-band sizes, with an average mass-weighted to light-weighted size ratio thatvaries between $\sim0.45$ and $0.8$ among the clusters. We find that the medianlight-weighted size of the passive galaxies in the two more evolved clusters is$\sim24\%$ larger than for field galaxies, independent of the use ofcircularized effective radii or semi-major axes. These two clusters also show asmaller size ratio than the less evolved cluster, which we investigate usingcolor gradients to probe the underlying $M_{*}/L_{H_{160}}$ gradients. Themedian color gradients are $\nabla{z-H} \sim-0.4$ mag dex$^{-1}$, twice thelocal value. Using stellar populations models, these gradients are bestreproduced by a combination of age and metallicity gradients. Our results favorthe minor merger scenario as the dominant process responsible for the observedgalaxy properties and the environmental differences at this redshift. Theenvironmental differences support that clusters experience acceleratedstructural evolution compared to the field, likely via an epoch of enhancedminor merger activity during cluster assembly.

The KMOS Cluster Survey (KCS) II - The Effect of Environment on the Structural Properties of Massive Cluster Galaxies at Redshift $1.39 < z <1.61$