Substructure, supernovae, and a time-resolved star formation history for Upper Scorpius

The improved astrometry precision of Gaia-eDR3 allows us to perform a detailed study the Upper Scorpius OB association and revisit its spatial, kinematic, age substructure. We achieve this by combining clustering techniques complementing with estimations based on Gaia photometry. Our census retrieves 3661 candidate members for contamination $\sim$9\%. also extract an astrometrically clean sample 3004 sources $\sim$6\%. show that can be divided into at least 3 main kinematic groups. systematically investigate characterize Scorpius' internal structure, revealing $\sim 34\%$ stellar populations are contained in 7 spatial substructures, well defined boundaries, kinematics relative ages, suggested names: $\pi$ Scorpii (20 $^{\pm2}_{\pm1}$ Myr), $\alpha$ (14$^{\pm2}_{\pm1}$ $\delta$ (9$^{\pm2}_{\pm1}$ $\beta$ (8$^{\pm1}_{\pm1}$ $\omega$ $\nu$ (7$^{\pm1}_{\pm1}$ after their brightest member, known $\rho$ Ophiuchi (4$^{\pm1}_{\pm1}$ Myr). find clear correlation (1) density-age, providing empirical expansion law tested other associations, (2) tangential velocity-age, constrains dynamics these substructures position potential past triggering events. estimate time which 4 supernovae events occurred Scorpius. Based findings, we tie together previous work region suggest star formation history unprecedented temporal resolution.