"Kinematic Ages in Sco–Cen and the PDS 70 Planetary System"

Abstract:

PDS 70 is the first confirmed multi‑planet system imaged within a protoplanetary disk, but the evolutionary state of its companions depends strongly on the poorly constrained age of the system and its Upper Centaurus–Lupus (UCL) environment. I will present a kinematic approach to this problem using Chronostar, a Bayesian forward‑modelling framework that decomposes stellar populations in six‑dimensional phase space into expanding Gaussian components. Applied to a candidate population associated with the T component of Sco–Cen, our reconstruction identifies PDS 70 as part of an extended, elongated young stellar structure with a membership‑weighted age of approximately 12–15 Myr. I will discuss how this kinematic age compares to other UCL age estimates, and what it implies for the luminosities, masses, and formation scenarios of PDS 70 b and c when combined with planetary cooling tracks and dynamical mass constraints.