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Abundance analysis of three new extremely metal-poor stars, including one CEMP-s star
P. François, T. Suda, S. Wanajo +5
We report a detailed abundance analysis of three extremely metal-poor (EMP) stars thanks to spectra obtained with the high-dispersion spectrograph (HDS) at the Subaru telescope. Th…
A first-principles binary neutron star merger model of GW170817, GRB170817A, and AT2017gfo
Kenta Kiuchi, Sho Fujibayashi, Kota Hayashi +6
The multimessenger observation of the binary neutron star merger event GW170817, associated with its electromagnetic counterparts GRB170817A and AT2017gfo, marked a milestone in as…
Non-LTE Ionization Modeling for Helium and Strontium in Neutron Star Merger Ejecta
Koya Chiba, Masaomi Tanaka, Shinya Wanajo +3
The material ejected from a binary neutron star merger produces "kilonova," a radioactively powered emission at ultraviolet, optical, and infrared wavelengths. The early-phase spec…