Kinematic age and substructure of the Scorpius-Centaurus association

Scorpius-Centaurus OB2 association (Sco-Cen) is the nearest region of massive star formation that represents a local laboratory to study a wide variety of topics, from young circumstellar disks and planets in the making to the insight into the initial mass function due to its proximity. A precision astrometry from Gaia helps to significantly extend its membership lists. However, age determination of young and low-mass stars from evolutionary models remains nontrivial.
We analysed Sco-Cen with Chronostar, a novel Bayesian technique for kinematic age determination that performs an iterative search for members in the 6D position-kinematic space. Membership selection is based purely on the kinematics. Our Sco-Cen model consists of 8 kinematically distinct components comprising nearly 9000 stars. Each of the components has an independently-fit kinematic age that is consistent with the isochronal age from the literature.