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

White dwarfs (WDs) often show metal lines in their spectra, indicatingaccretion of asteroidal material. Our Sun is to become a WD in several Gyr.Here, we examine how the solar WD accretes from the three major small bodypopulations: the main belt asteroids (MBAs), Jovian trojan asteroids (JTAs),and trans-Neptunian objects (TNOs). Owing to the solar mass loss during thegiant branch, 40\% of the JTAs are lost but the vast majority of MBAs and TNOssurvive. During the WD phase, objects from all three populations aresporadically scattered onto the WD, implying ongoing accretion. For youngcooling ages $\lesssim 100$ Myr, accretion of MBAs predominates; our predictedaccretion rate $\sim10^6$ g/s falls short of observations by two orders ofmagnitude. On Gyr timescales, thanks to the consumption of the TNOs that kicksin $\gtrsim 100$ Myr, the rate oscillates around $10^6-10^7$ g/s until severalGyr and drops to $\sim10^5$ g/s at 10 Gyr. Our solar WD accretion rate from 1Gyr and beyond agrees well with those of the extrasolar WDs. We show that forthe solar WD, the accretion source region evolves in an inside-out pattern.Moreover, in a realistic small body population with individual sizes covering awide range as WD pollutants, the accretion is dictated by the largest objects.As a consequence, the accretion rate is lower by an order of magnitude thanthat from a population of bodies of a uniform size and the same total mass andshows greater scatter.

Metal pollution of the solar white dwarf by solar system small bodies