English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

(Abridged abstract) We explore the formation of ultra-massive (M_{\rm WD}\gtrsim 1.05 M_\sun$), carbon-oxygen core white dwarfs resulting from singlestellar evolution. We also study their evolutionary and pulsational propertiesand compare them with those of the ultra-massive white dwarfs with oxygen-neoncores resulting from carbon burning in single progenitor stars, and with binarymerger predictions. We consider two single-star evolution scenarios for theformation of ultra-massive carbon-oxygen core white dwarfs that involverotation of the degenerate core after core helium burning and reduced mass-lossrates in massive asymptotic giant-branch stars. We compare our findings withthe predictions from ultra-massive white dwarfs resulting from the merger oftwo equal-mass carbon-oxygen core white dwarfs, by assuming complete mixingbetween them and a carbon-oxygen core for the merged remnant. The resultingultra-massive carbon-oxygen core white dwarfs evolve markedly slower than theiroxygen-neon counterparts. Our study strongly suggests the formation ofultra-massive white dwarfs with carbon-oxygen core from single stellarevolution. We find that both the evolutionary and pulsation properties of thesewhite dwarfs are markedly different from those of their oxygen-neon corecounterparts and from those white dwarfs with carbon-oxygen core that mightresult from double degenerate mergers. This can eventually be used to discernthe core composition of ultra-massive white dwarfs and their formationscenario.

The formation of ultra-massive carbon-oxygen core white dwarfs and their evolutionary and pulsational properties