7 papers
New Constraints on -process Nucleosynthesis in Neutron Star Mergers from GW170817 Late-Phase Spectra
Salma Rahmouni, Masaomi Tanaka, Daiji Kato +2
The neutron star merger event GW170817 provided the first direct evidence of -process nucleosynthesis. Observed spectra of its electromagnetic counterpart AT2017gfo exhibited se…
Exploring highly-deformed ground states involving the second intruder orbit in Z>50 even-even nuclei
Tsunenori Inakura, Wataru Horiuchi, Shin'ichiro Michimasa +1
We present a systematic survey of even-even nuclei with to identify where a very large prolate configuration driven by the second intruder orbit emerges. Within the energy d…
Theoretical study of Th III energy levels and transitions for applications to kilonova spectra
Laima Kitovienė, Gediminas Gaigalas, Pavel Rynkun +3
The neutron star merger is a promising site of heavy element production. By producing heavy elements, the neutron star merger gives rise to a thermal transient called a kilonova. S…
Systematic opacity calculations for kilonovae -- II. Improved atomic data for singly ionized lanthanides
Daiji Kato, Masaomi Tanaka, Gediminas Gaigalas +2
Lanthanides play most important roles in the opacities for kilonova, ultraviolet-optical-infrared emission from neutron star mergers. Although several efforts have been made to con…
Revisiting Near-Infrared Features of Kilonovae: The Importance of Gadolinium
Salma Rahmouni, Masaomi Tanaka, Nanae Domoto +7
The observation of the kilonova AT2017gfo and investigations of its light curves and spectra confirmed that neutron star mergers are sites of r-process nucleosynthesis. However, th…
Thorium in Kilonova Spectra: Exploring the Heaviest Detectable Element
Nanae Domoto, Shinya Wanajo, Masaomi Tanaka +2
Kilonova spectra provide us with the direct information of r-process nucleosynthesis in neutron star mergers. In this paper, we study the signatures of elements beyond the third r-…
The -Process Alliance: Enrichment of -process Elements in a Simulated Milky Way-like Galaxy
Yutaka Hirai, Timothy C. Beers, Young Sun Lee +11
We study the formation of stars with varying amounts of heavy elements synthesized by the rapid neutron-capture process (-process) based on our detailed cosmological zoom-in sim…