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/

Zendy Plus

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

Zendy Tools

Zendy Open

White dwarfs that have accreted rocky planetary bodies provide uniqueinsights regarding the bulk composition of exoplanetary material. The analysispresented here uses observed white dwarf atmospheric abundances to constrainboth where in the planetary system the pollutant bodies originated, and thegeological and collisional history of the pollutant bodies. At least one, butpossibly up to nine, of the 17 systems analysed have accreted a body dominatedby either core-like or mantle-like material. The approximately even spread inthe core mass fraction of the pollutants and the lack of crust-rich pollutantsin the 17 systems studied here suggest that the pollutants are often thefragments produced by the collision of larger differentiated bodies. Thecompositions of many pollutants exhibit trends related to elemental volatility,which we link to the temperatures and, thus, the locations at which thesebodies formed. Our analysis found that the abundances observed in 11 of the 17systems considered are consistent with the compositions of nearby stars incombination with a trend related to elemental volatility. The even spread andlarge range in the predicted formation location of the pollutants suggests thatpollutants arrive in white dwarf atmospheres with a roughly equal efficiencyfrom a wide range of radial locations. Ratios of elements with differentcondensation temperatures such as Ca/Mg, Na/Mg, and O/Mg distinguish betweendifferent formation temperatures, whilst pairs of ratios of siderophilic andlithophilic elements such as Fe/Mg, Ni/Mg and Al/Mg, Ca/Mg distinguish betweentemperature dependent trends and geological trends.

Polluted White Dwarfs: Constraints on the Origin and Geology of Exoplanetary Material