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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The recently discovered hypervelocity white dwarf LP 40-65 (aka GD 492) hasbeen suggested as the outcome of the failed disruption of a white dwarf in asub-luminous Type Ia supernova (SN Ia). We present new observations confirmingGD 492 as a single star with unique spectral features. Our spectroscopicanalysis suggests that a helium-dominated atmosphere, with ~ 33 percent neonand 2 percent oxygen by mass, can reproduce most of the observed properties ofthis highly unusual star. Although our atmospheric model contrasts with theprevious analysis in terms of dominant atmospheric species, we confirm that theatmosphere of GD 492 is strongly hydrogen deficient, log(H/He) < -5, anddisplays traces of eleven other alpha- and iron-group elements (with sulfur,chromium, manganese, and titanium as new detections), indicating nuclearprocessing of carbon and silicon. We measure a manganese-to-iron ratio seventimes larger than Solar. While the observed abundances of GD 492 do not fullymatch any predicted nuclear yields of a partially-burned supernova remnant, themanganese excess strongly favors a link with a single-degenerate SN Ia eventover alternative scenarios.

Further insight on the hypervelocity white dwarf, LP 40-365 (GD 492): a nearby emissary from a single-degenerate Type Ia supernova