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Wrinkles in Time: Analysis of Stellar Age Trends in Orbital Space Signatures from Transient Spiral Structure

Presentation #409.03 in the session Galaxies.

Published onJul 01, 2023
Wrinkles in Time: Analysis of Stellar Age Trends in Orbital Space Signatures from Transient Spiral Structure

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.

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