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Two delays in white dwarf evolution revealed by Gaia

Published online by Cambridge University Press:  09 October 2020

Sihao Cheng Open the ORCID record for Sihao Cheng [Opens in a new window]
Sihao Cheng*
Affiliation:
Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD21218, SA email: s.cheng@jhu.edu
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Abstract

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By comparing two age indicators of high-mass white dwarfs (WDs) derived from Gaia data, two discoveries have been made recently: one is the existence of a cooling anomaly that produces the Q branch structure on the Hertzsprung–Russell diagram, and the other is the existence of high-mass WDs as double-WD merger products. The former poses a challenge for WD cooling models, and the latter has implications on binary evolution and type-Ia supernovae.

Keywords

white dwarfsstars: evolutionstars: kinematicsHertzsprung-Russell diagrammethods: statistical
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. 175 - 178
Copyright
© International Astronomical Union 2020

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