NLTE calculations indicate strontium is required to explain the onset of the 1μm feature at early times in AT2017gfo, while helium can dominate at later epochs with plausible masses.
ApJ , archivePrefix = "arXiv", eprint =
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Dust from refractory r-process elements forms efficiently in kilonova ejecta and explains the observed late-time infrared spectra.
Non-LTE models for He and Sr in kilonova ejecta show that ~1% He or 1-10% Sr can reproduce the 1μm absorption feature in AT2017gfo, implying low-Ye, low-entropy r-process conditions.
Free neutrons survive r-process freeze-out in fast ejecta of neutron star mergers and their beta-decay heating produces a visible early kilonova precursor for mass fractions above ~0.05.
Kilonova-like emissions after long GRBs GRB211211A and GRB230307A are consistent with collapsar nucleosynthesis using a single weak r-process component without lanthanide-rich material.
Treating select nuclear isomers as independent states with temperature-dependent rates in r-process networks yields predictions that the 743.3 keV Nb-97m and 555.6 keV Y-91m lines may be detectable at galactic distances by COSI, AMEGO, or LOX.
citing papers explorer
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Strontium and helium in the kilonova AT2017gfo: Origin of the 1{\mu}m feature constrained via NLTE calculations
NLTE calculations indicate strontium is required to explain the onset of the 1μm feature at early times in AT2017gfo, while helium can dominate at later epochs with plausible masses.
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Heavy element dust explains the late-time spectra of kilonovae
Dust from refractory r-process elements forms efficiently in kilonova ejecta and explains the observed late-time infrared spectra.
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Non-LTE Ionization Modeling for Helium and Strontium in Neutron Star Merger Ejecta
Non-LTE models for He and Sr in kilonova ejecta show that ~1% He or 1-10% Sr can reproduce the 1μm absorption feature in AT2017gfo, implying low-Ye, low-entropy r-process conditions.
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Nucleosynthesis in the fast ejecta of a neutron star merger
Free neutrons survive r-process freeze-out in fast ejecta of neutron star mergers and their beta-decay heating produces a visible early kilonova precursor for mass fractions above ~0.05.
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Kilonovae and Long-duration Gamma-ray Bursts
Kilonova-like emissions after long GRBs GRB211211A and GRB230307A are consistent with collapsar nucleosynthesis using a single weak r-process component without lanthanide-rich material.
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Nuclear Isomers and Their Impact on Gamma-Ray Emission in Binary Neutron Star Mergers
Treating select nuclear isomers as independent states with temperature-dependent rates in r-process networks yields predictions that the 743.3 keV Nb-97m and 555.6 keV Y-91m lines may be detectable at galactic distances by COSI, AMEGO, or LOX.