How did the Milky Way assemble its present-day disc, bar, and bulge, and what imprint has this history left on the chemo-dynamical structure we observe today ? In this talk, I present a comprehensive view of the Galaxy’s assembly based on a novel orbit-superposition reconstruction of the Milky Way constrained by APOGEE DR17. I first show that orbit-based modelling can recover the stellar density, kinematics, and chemical-abundance structure of the Galaxy despite the incomplete spatial coverage of Galactic surveys. I then use this framework to infer the large-scale organisation of the disc and bulge, as well as the spatially resolved star-formation history of the disc. The resulting chemo-dynamical signatures connect stellar populations with the Galaxy’s large-scale structure, providing a coherent assembly narrative that links the Milky Way’s present-day orbital structure to its formation history.
Rediscovering the Milky Way with orbits of its stars
Jeudi 28 mai 2026
de
11:00 à
12:00
Conference room, building 17
