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        The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1–C8 and C10–C18

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        Author
        Zinn, Joel C.
        Stello, Dennis
        Elsworth, Yvonne
        García, Rafael A.
        Kallinger, Thomas
        Mathur, Savita
        Mosser, Benoît
        Hon, Marc
        Bugnet, Lisa
        Jones, Caitlin
        Reyes, Claudia
        Sharma, Sanjib
        Schönrich, Ralph
        Warfield, Jack T.
        Luger, Rodrigo
        Vanderburg, Andrew
        Kobayashi, Chiaki
        Pinsonneault, Marc H.
        Johnson, Jennifer A.
        Huber, Daniel
        Buder, Sven
        Joyce, Meridith
        Bland-Hawthorn, Joss
        Casagrande, Luca
        Lewis, Geraint F.
        Miglio, Andrea
        Nordlander, Thomas
        Davies, Guy R.
        Silva, Gayandhi De
        Chaplin, William J.
        Silva Aguirre, Victor
        Attention
        2299/25396
        Abstract
        Abstract: We present the third and final data release of the K2 Galactic Archaeology Program (K2 GAP) for Campaigns C1–C8 and C10–C18. We provide asteroseismic radius and mass coefficients, κ R and κ M , for ∼19,000 red giant stars, which translate directly to radius and mass given a temperature. As such, K2 GAP DR3 represents the largest asteroseismic sample in the literature to date. K2 GAP DR3 stellar parameters are calibrated to be on an absolute parallactic scale based on Gaia DR2, with red giant branch and red clump evolutionary state classifications provided via a machine-learning approach. Combining these stellar parameters with GALAH DR3 spectroscopy, we determine asteroseismic ages with precisions of ∼20%–30% and compare age-abundance relations to Galactic chemical evolution models among both low- and high-α populations for α, light, iron-peak, and neutron-capture elements. We confirm recent indications in the literature of both increased Ba production at late Galactic times as well as significant contributions to r-process enrichment from prompt sources associated with, e.g., core-collapse supernovae. With an eye toward other Galactic archeology applications, we characterize K2 GAP DR3 uncertainties and completeness using injection tests, suggesting that K2 GAP DR3 is largely unbiased in mass/age, with uncertainties of 2.9% (stat.) ± 0.1% (syst.) and 6.7% (stat.) ± 0.3% (syst.) in κ R and κ M for red giant branch stars and 4.7% (stat.) ± 0.3% (syst.) and 11% (stat.) ± 0.9% (syst.) for red clump stars. We also identify percent-level asteroseismic systematics, which are likely related to the time baseline of the underlying data, and which therefore should be considered in TESS asteroseismic analysis.
        Publication date
        2022-02-24
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/1538-4357/ac2c83
        License
        http://creativecommons.org/licenses/by/4.0/
        Other links
        http://hdl.handle.net/2299/25396
        Relations
        School of Physics, Engineering & Computer Science
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