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

ABSTRACT Very little is known about the young planet population because detection of small planets orbiting stars obscured by effects stellar activity and fast rotation, which mask within radial velocity transit data sets. The few that have been discovered in clusters generally orbit too faint for any detailed follow-up analysis. Here, we present characterization a new mini-Neptune bright (V = 9) nearby K2 dwarf star, HD 18599. candidate was originally detected TESS light curves from sectors 2, 3, 29, 30, with an orbital period 4.138 d. We then used HARPS FEROS velocities, to find companion mass be 25.5$\pm$4.6 $M_{\oplus }$. When combine this measured radius 2.70$\pm$0.05 $R_{\oplus }$, high planetary density 7.1$\pm$1.4 g cm$^{-3}$. exists on edge Neptune Desert first (300 Myr) its type inhabit region. Structure models argue bulk composition consist 23 per cent H$_2$O 77 Rock Iron. Future large ground- space-based telescopes can enable us begin understand detail characteristics Neptunes galaxy.