Presentation #409.03 in the session Galaxies.
One of the great discoveries from Gaia DR2 is the complex, rich clustering of Solar Neighborhood (SNd) kinematics. These kinematics include over-densities or “wrinkles” in high eccentricity space, which are likely post-resonant signatures from the passage of spiral arms.
In this talk, I will demystify the dynamics that produce these wrinkles, and present tracer particle simulation results that suggest younger stars preferentially populate them. This is significant since wrinkles exist in a region of kinematic space that is otherwise expected to be populated almost entirely by older stars.
I will describe a modified single linkage algorithm I produced to identify wrinkles members in SNd kinematics. Then I will show results from applying the algorithm to a combined catalog of astrometric and spectroscopic data from Gaia DR3, GALAH DR3, and APOGEE DR16.
This is part of a collaborative study that will also place gyrochronologic ages, obtained using TESS data, on young wrinkle members. The aim of this collaboration is to constrain a timeline for the history of spiral structure affecting the SNd.