Abstract

I will discuss how studying observed heterogeneities in stellar kinematic and chemistry space with large datasets lend insight into galactic processes and dynamics. Kinematics — Trick+19 identified overdensities, or “wrinkles”, of stars in eccentric orbits thought to result from the kinematic heating during spiral arm passages. Using photometry from TESS and gyrochronology age-rotation relations, we are calculating stellar age distributions in wrinkles to, for the first time, place a timestamp on transient spiral arm passages. Chemistries — The Sun shows a trend of relative depletion in refractory elements compared to ~80% of its counterparts. We use data-driven learning to infer 13 abundances with Gaia RVS spectra for > 17,000 sun-like stars and 50 planet hosts. With these data, we show the Sun remains relatively refractory depleted compared to sun-like stars regardless of our current knowledge of planet host status, inconsistent with theories of planets locking up refractories. Thus, we take a galactic-scale approach and assess the role of nucleosynthetic heterogeneities.  We find that the Sun is enriched in type 1a supernovae material by > 3sigma compared to its solar counterparts, corresponding to its observed refractory depletion.