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Testing white dwarf cosmochronology using wide double white dwarfs

Published online by Cambridge University Press:  09 October 2020

Tyler Heintz Open the ORCID record for Tyler Heintz [Opens in a new window]  and
JJ Hermes
Tyler Heintz
Affiliation:
Institute for Astrophyiscal Research, Boston University, 725 Commonwealth Ave, BostonMA02215, USA
JJ Hermes
Affiliation:
Institute for Astrophyiscal Research, Boston University, 725 Commonwealth Ave, BostonMA02215, USA
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Abstract

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We present a sample of nearly 650 widely separated double white dwarf binaries found using Gaia DR2 astrometry. We derive preliminary total ages for each white dwarf in our sample using Gaia photometry and compare the total ages of both components of each binary in our sample. We find agreement within 3 sigma between the two ages ∼85% of the time with median age uncertainties of ∼3.5 Gyr depending on which initial-final mass relation is used. When a subsample with the most precise ages is used, the agreement within 3 sigma drops to ∼70% with median age uncertainties of 300-600 Myr.

Keywords

white dwarfsbinary starsages
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 197 - 201
Copyright
© International Astronomical Union 2020

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