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

Chemical compositions of giant planets provide a means to constrain how andwhere they form. Traditionally, super-stellar elemental abundances in giantplanets were thought to be possible due to accretion of metal-rich solids. Suchenrichments are accompanied by oxygen-rich compositions (i.e. C/O below thedisc's value, assumed to be solar, C/O=0.54). Without solid accretion theplanets are expected to have sub-solar metallicity, but high C/O ratios. Thisarises because the solids are dominated by oxygen-rich species, e.g. H$_2$O andCO$_2$, which freeze out in the disk earlier than CO, leaving the gas metalpoor but carbon-rich. Here we demonstrate that super-solar metallicities can beachieved by gas accretion alone when growth and radial drift of pebbles areconsidered in protoplanetary discs. Through this mechanism planets maysimultaneously acquire super-solar metallicities and super-solar C/O ratios.This happens because the pebbles transport volatile species inward as theymigrate through the disc, enriching the gas at snow lines where the volatilessublimate. Furthermore, the planet's composition can be used to constrain whereit formed. Since high C/H and C/O ratios cannot be created by accreting solids,it may be possible to distinguish between formation via pebble accretion andplanetesimal accretion by the level of solid enrichment. Finally, we expectthat Jupiter's C/O ratio should be near or above solar if its enhanced carbonabundance came through accreting metal rich gas. Thus Juno's measurement ofJupiter's C/O ratio should determine whether Jupiter accreted its metals fromcarbon rich gas or oxygen rich solids.

Chemical enrichment of giant planets and discs due to pebble drift