An Actinide-boost Star Discovered in the Gaia-Sausage-Enceladus
Yangming Lin, Haining Li, Ruizheng Jiang, Wako Aoki, Satoshi Honda, Zhenyu He, Ruizhi Zhang, Zhuohan Li, Gang Zhao

TL;DR
This paper reports the discovery of the first actinide-boost star within the Gaia-Sausage-Enceladus, providing new insights into $r$-process nucleosynthesis in accreted dwarf galaxies through detailed spectral analysis and theoretical modeling.
Contribution
It is the first confirmed actinide-boost star within the GSE, with detailed abundance analysis and comparison to $r$-process models, highlighting its origin and nucleosynthesis implications.
Findings
First confirmed actinide-boost star in GSE.
Best fit with magnetorotationally driven jet supernova $r$-process model.
Most actinide-boost stars are likely from accreted dwarf galaxies.
Abstract
We report the discovery of an actinide-boost, very metal-poor (), -process-enhanced () star, LAMOST J0804+5740, within the Gaia-Sausage-Enceladus (GSE). Based on the high-resolution () and high signal-to-noise ratio spectra obtained with the High Dispersion Spectrograph on the Subaru Telescope, the abundances of 48 species are determined. Its establishes it as the first confirmed actinide-boost star within the GSE. Comparative analysis of its abundance pattern with theoretical -process models reveals that the magnetorotationally driven jet supernova -process model with = 0.2 provides the best fit and successfully reproduces the actinide-boost signature. Kinematic analysis of actinide-boost stars reveals that…
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