The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1-C8 and C10-C18 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2022

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

Joel C. Zinn
  • Function : Author
Dennis Stello
  • Function : Author
Yvonne Elsworth
  • Function : Author
Rafael A. García
  • Function : Author
Thomas Kallinger
  • Function : Author
Savita Mathur
  • Function : Author
Marc Hon
  • Function : Author
Lisa Bugnet
  • Function : Author
Caitlin Jones
  • Function : Author
Claudia Reyes
  • Function : Author
Sanjib Sharma
  • Function : Author
Ralph Schönrich
  • Function : Author
Jack T. Warfield
  • Function : Author
Rodrigo Luger
  • Function : Author
Andrew Vanderburg
  • Function : Author
Chiaki Kobayashi
  • Function : Author
Marc H. Pinsonneault
  • Function : Author
Jennifer A. Johnson
  • Function : Author
Daniel Huber
  • Function : Author
Sven Buder
  • Function : Author
Meridith Joyce
  • Function : Author
Joss Bland-Hawthorn
  • Function : Author
Luca Casagrande
  • Function : Author
Geraint F. Lewis
  • Function : Author
Andrea Miglio
  • Function : Author
Thomas Nordlander
  • Function : Author
Guy R. Davies
  • Function : Author
Gayandhi De Silva
  • Function : Author
William J. Chaplin
  • Function : Author
Victor Silva Aguirre
  • Function : Author

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.
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insu-03713338 , version 1 (04-07-2022)

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Joel C. Zinn, Dennis Stello, Yvonne Elsworth, Rafael A. García, Thomas Kallinger, et al.. The K2 Galactic Archaeology Program Data Release 3: Age-abundance Patterns in C1-C8 and C10-C18. The Astrophysical Journal, 2022, 926, ⟨10.3847/1538-4357/ac2c83⟩. ⟨insu-03713338⟩
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