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We explore the stellar mass density and colour profiles of 118 low redshift,massive, central galaxies, selected to have assembled 90 percent of theirstellar mass 6 Gyr ago, finding evidence of the minor merger activity expectedto be the driver behind the size growth of quiescent galaxies. We use imagingdata in the $g, r, i, z, y$ bands from the Subaru Hyper Suprime-Cam survey andperform SED fitting to construct spatially well-resolved radial profiles incolour and stellar mass surface density. Our visual morphologicalclassification reveals that $\sim 42$ percent of our sample displays tidalfeatures, similar to previous studies, $\sim 43$ percent of the remainingsample display a diffuse stellar halo and only $\sim 14$ percent display nofeatures, down to a limiting $\mu_{r\mathrm{-band}}$ $\sim$ 28 magarcsec$^{-2}$. We find good agreement between the stacked colour profiles ofour sample to those derived from previous studies and an expected smooth,declining stellar mass surface density profile in the central regions (< 3R$_{\mathrm{e}}$). However, we also see a flattening of the profile ($\Sigma_*\sim 10^{7.5}$ M$_\odot$ kpc$^{-2}$) in the outskirts (up to 10R$_{\mathrm{e}}$), which is revealed by our method of specifically targetingtidal/accretion features. We find similar levels of tidal features andbehaviour in the stellar mass surface density profiles in a younger comparisonsample, however a lack of diffuse haloes. We also apply stacking techniques,similar to those in previous studies, finding such procedures wash out tidalfeatures and thereby produces smooth declining profiles. The stellar materialin the outskirts contributes on average $\sim 10^{10}$ M$_\odot$ or a fewpercent of the total stellar mass and has similar colours to SDSS satellites ofsimilar stellar mass.

The nature and origins of the low surface brightness outskirts of massive, central galaxies in Subaru HSC