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7 papers · 1 filter
Distillation of Fe in Ultramassive O-Ne White Dwarfs
Matthew E. Caplan, Simon Blouin, Ian F. Freeman
When white dwarfs freeze the plasma mixtures inside them undergo separation processes which can produce radical changes in the composition profile of the star. The abundance of neu…
Accurate Diffusion Coefficients for Dense White Dwarf Plasma Mixtures
M. E. Caplan, E. B. Bauer, I. F. Freeman
Diffusion coefficients are essential microphysics input for modeling white dwarf evolution, as they impact phase separation at crystallization and sedimentary heat sources. Present…
Cooling Delays from Iron Sedimentation and Iron Inner Cores in White Dwarfs
M. E. Caplan, I. F. Freeman, C. J. Horowitz +2
Do white dwarfs have inner cores made of iron? Neutron rich nuclei like Fe experience a net gravitational force and sediment toward the core. Using new phase diagrams and mo…
Nuclear fission chain reaction in cooling white dwarf stars
C. J. Horowitz, M. E. Caplan
The first solids that form as a white dwarf (WD) starts to crystallize are expected to be greatly enriched in actinides. Previously [PRL 126, 1311010] we found that these solids mi…
Precise Diffusion Coefficients for White Dwarf Astrophysics
M. E. Caplan, I. F. Freeman
Observations of galactic white dwarfs with Gaia have allowed for unprecedented modeling of white dwarf cooling, resolving core crystallization and sedimentary heating from neutron…
Actinide crystallization and fission reactions in cooling white dwarf stars
C. J. Horowitz, M. E. Caplan
The first solids that form as a cooling white dwarf (WD) starts to crystallize are expected to be greatly enriched in actinides. This is because the melting points of WD matter sca…