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We present an analysis of the structure of post-starburst (PSB) galaxies inthe redshift range $0.5 < z < 2$, using a photometrically-selected sampleidentified in the Ultra Deep Survey (UDS) field. We examine the structure of$\sim80$ of these transient galaxies using radial light $\mu(r)$ profilesobtained from CANDELS $\textit{Hubble Space Telescope}$ near-infrared/opticalimaging, and compare to a large sample of $\sim2000$ passive and star-forminggalaxies. For each population, we determine their typical structural properties(effective radius $r_{\rm e}$, S\'ersic index $n$) and find significantdifferences in PSB structure at different epochs. At high redshift ($z > 1$),PSBs are typically massive ($M_* > 10^{10}\rm\,M_{\odot}$), very compact andexhibit high S\'ersic indices, with structures that differ significantly fromtheir star-forming progenitors but are similar to massive passive galaxies. Incontrast, at lower redshift ($0.5 < z < 1$), PSBs are generally of low mass($M_* < 10^{10}\rm\,M_{\odot}$) and exhibit compact but less concentratedprofiles (i.e. lower S\'ersic indices), with structures similar to low-masspassive discs. Furthermore, for both epochs we find remarkably consistent PSBstructure across the optical/near-infrared wavebands (which largely tracedifferent stellar populations), suggesting that any preceding starburst and/orquenching in PSBs was not strongly centralized. Taken together, these resultsimply that PSBs at $z > 1$ have been recently quenched during a majordisruptive event (e.g. merger or protogalactic collapse) which formed a compactremnant, while at $z < 1$ an alternative less disruptive process is primarilyresponsible. Our results suggest that high-$z$ PSBs are an intrinsicallydifferent population to those at lower redshifts, and indicate differentquenching routes are active at different epochs.

The structure of post-starburst galaxies at $0.5 < z < 2$: evidence for two distinct quenching routes at different epochs