Astronomers have discovered an exceptionally rare star, LAMOST J0804+5740, that may help solve one of astronomy's enduring mysteries: the origin of the universe's heaviest elements. This star, located in the Gaia Sausage-Enceladus, an ancient remnant of a dwarf galaxy that merged with the Milky Way, is classified as an actinide-boost star due to its high abundance of radioactive elements like thorium.
Using high-resolution spectroscopy, researchers determined that the star's abundance pattern aligns with theoretical models of r-process nucleosynthesis, particularly those involving magnetorotationally driven jet supernovae. The discovery of LAMOST J0804+5740 provides valuable insights into the production of heavy elements in the universe and suggests that such stars are more likely to originate from accreted dwarf galaxies.
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