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Very little is known about the young planet population because the detectionof small planets orbiting young stars is obscured by the effects of stellaractivity and fast rotation which mask planets within radial velocity andtransit data sets. The few planets that have been discovered in young clustersgenerally orbit stars too faint for any detailed follow-up analysis. Here wepresent the characterization of a new mini-Neptune planet orbiting the bright(V=9) and nearby K2 dwarf star, HD 18599. The planet candidate was originallydetected in TESS light curves from Sectors 2, 3, 29, and 30, with an orbitalperiod of 4.138~days. We then used HARPS and FEROS radial velocities, to findthe companion mass to be 25.5$\pm$4.6~M$_\oplus$. When we combine this with themeasured radius from TESS, of 2.70$\pm$0.05~R$_\oplus$, we find a highplanetary density of 7.1$\pm$1.4~g cm$^{-3}$. The planet exists on the edge ofthe Neptune Desert and is the first young planet (300 Myr) of its type toinhabit this region. Structure models argue for a bulk composition to consistof 23% H$_2$O and 77% Rock and Iron. Future follow-up with large ground- andspace-based telescopes can enable us to begin to understand in detail thecharacteristics of young Neptunes in the galaxy.

A dense mini-Neptune orbiting the bright young star HD 18599