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During the early stages of galaxy evolution, a significant {fraction} ofgalaxies undergo a transitional phase between the "blue nugget" systems, whicharise from the compaction of large, active star-forming disks, and the "rednuggets", which are red and passive compact galaxies. These objects aretypically only observable with space telescopes, and detailed studies of theirsize, mass, and stellar population parameters have been conducted on relativelysmall samples. Strong gravitational lensing can offer a new opportunity tostudy them in detail, even with ground-based observations. In this study, wepresent the first 6 \textit{bona fide} sample of strongly lensed post-bluenugget (pBN) galaxies, which were discovered in the Kilo Degree Survey (KiDS).By using the lensing-magnified luminosity from optical and near-infrared bands,we have derived robust structural and stellar population properties of themultiple images of the background sources. The pBN galaxies have very smallsizes ($<1.3$ kpc), high mass density inside 1 kpc ($\log \Sigma_1 /M_{\odot}\mathrm{kpc}^{-2}>9.3$), and low specific star formation rates ($\log\mathrm{sSFR/Gyrs}\lesssim0.5$), which places them between the blue and rednugget phases. The size-mass and $\Sigma_1$-mass relations of this sample areconsistent with those of the red nuggets, while their sSFR is close to thelower end of compact star-forming blue nugget systems at the same redshift,suggesting a clear evolutionary link between them.

Multi-band analysis of strong gravitationally lensed post-blue nugget candidates from the Kilo-Degree Survey