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Using deep Hubble Frontier Fields imaging and slitless spectroscopy from theGrism Lens-Amplified Survey from Space, we analyze 2200 cluster and 1748 fieldgalaxies at $0.2\leq z\leq0.7$ to determine the impact of environment on galaxysize and structure at $\log M_*/M_\odot>7.8$, an unprecedented limit at theseredshifts. Based on simple assumptions-$r_e=f(M_*)$-we find no significantdifferences in half-light radii ($r_e$) between equal-mass cluster or fieldsystems. More complex analyses-$r_e=f(M_*,U-V,n,z,\Sigma$)-reveal local density$(\Sigma$) to induce only a $7\% \pm 3\%$ ($95\%$ confidence) reduction in$r_e$ beyond what can be accounted for by $U-V$ color, Sersic index ($n$), andredshift ($z$) effects.Almost any size difference between galaxies in high- andlow-density regions is thus attributable to their different distributions inproperties other than environment. Indeed, we find a clear color-$r_e$correlation in low-mass passive cluster galaxies ($\log M_*/M_\odot<9.8$) suchthat bluer systems have larger radii, with the bluest having sizes consistentwith equal-mass star-forming galaxies. We take this as evidence thatlarge-$r_e$ low-mass passive cluster galaxies are recently acquired systemsthat have been environmentally quenched without significant structuraltransformation (e.g., by ram pressure stripping or starvation).Conversely,$\sim20\%$ of small-$r_e$ low-mass passive cluster galaxies appear to have beenin place since $z\sim3$. Given the consistency of the small-$r_e$ galaxies'stellar surface densities (and even colors) with those of systems more than tentimes as massive, our findings suggest that clusters mark places where galaxyevolution is accelerated for an ancient base population spanning most masses,with late-time additions quenched by environment-specific mechanisms are mainlyrestricted to the lowest masses.

The Grism Lens-Amplified Survey from Space (GLASS). IX. The dual origin of low-mass cluster galaxies as revealed by new structural analyses