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We study the mass-size relation of quiescent galaxies across variousenvironments, with a particular focus on its environmental dependence at thelow-mass part of $\log(M_\mathrm{star}/M_{\odot})\lesssim10.0$. Our sampleconsists of 13,667 quiescent galaxies with$\log(M_\mathrm{star}/M_{\odot})\ge9.4$ and $0.01<z<0.04$ from the SloanDigital Sky Survey. We find that the mass-size relation of low-mass quiescentgalaxies (LQGs) with $\log(M_\mathrm{star}/M_{\odot})\lesssim10.0$ depends ontheir environment, with LQGs in the highest-density environments exhibiting anaverage size $\sim70\%$ larger than those in isolated environments. Moreover,the slope of the mass-size relation for LQGs in high-density environments issignificantly shallower than that of their counterparts in isolatedenvironments. This is in contrast with high-mass quiescent galaxies with$\log(M_\mathrm{star}/M_{\odot})\gtrsim10.5$ that show a nearly identicalmass-size relation across all environments. Combined with additionaldiscoveries that the mass-size relation slopes of LQGs and star-forminggalaxies are similar to each other in high-density environments, and that LQGsin higher-density environments exhibit more disk-like structures, our resultssupport the idea that LQGs in high-density environments have evolved fromstar-forming galaxies through environmental effects, which are capable ofcausing their quenching and transformation into quiescent galaxies. With theaid of an analysis of merger rates for simulated galaxies from a cosmologicalgalaxy formation simulation, we suggest that the steep slope and lownormalization of the mass-size relation of LQGs in the lowest-densityenvironments may originate from recent gas-rich mergers, which occur over 10-30times more frequently in the progenitors of LQGs in the lowest-densityenvironments than in their counterparts in high-density environments at lowredshifts.

Low-mass Quiescent Galaxies Are Small in Isolated Environments: Environmental Dependence of the Mass-Size Relation of Low-mass Quiescent Galaxies