$R$-process enhancements of Gaia-Enceladus in GALAH DR3

Understand

The dominant site of production of $r$-process elements remains unclear despite recent observations of a neutron star merger.

• Observational constraints on the properties of the sites can be obtained by comparing $r$-process abundances in different environments.
• The recent Gaia data releases and large samples from high-resolution optical spectroscopic surveys are enabling us to compare $r$-process element abundances between stars formed in an accreted dwarf galaxy, Gaia-Enceladus, and those formed in the Milky Way.
• We aim to understand the origin of $r$-process elements in Gaia-Enceladus.