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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2 Pith papers cite this work. Polarity classification is still indexing.
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More complete lanthanide line data in radiative transfer modeling requires a lanthanide mass fraction of only 2.5e-3 to match the observed spectrum of AT 2017gfo, twenty times below prior claims.
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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Improved lanthanide constraints for the kilonova AT 2017gfo
More complete lanthanide line data in radiative transfer modeling requires a lanthanide mass fraction of only 2.5e-3 to match the observed spectrum of AT 2017gfo, twenty times below prior claims.