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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Atomic systems using 85Rb Rydberg atoms and vapor provide primary measurements of blackbody radiation temperature near 130 GHz and 24.5 THz with uncertainties of 1% and 0.13 K respectively.
Non-LTE effects strengthen the K I 7698 Å line, requiring abundance corrections up to -0.7 dex that align literature values with GCE models incorporating yields from rotating massive stars.
Time-resolved spectroscopy reveals broad and narrow LPVs in O VI from WD J005311, linked to line-driven wind instabilities and an unstable RRM disk, plus a pseudo-periodic UV oscillation.
Paschen jumps in Little Red Dots indicate their continua originate from free-bound recombination emission in low-temperature nebular gas rather than thermalized or AGN components.
Multiphase CGM absorption in DESI data shows cooler ions (Ca II, Mg II) have steeper radial W profiles than C IV, with galaxy vs. quasar differences, consistent with simulations.
LRDs require Compton-thick gas at moderate metallicity plus high accretion rates producing weak X-rays to explain their non-detection, implying they are not chemically pristine.
Relativistic CI+CCSD calculations of hyperfine constants in 45Sc+ yield nuclear quadrupole moment Q = 0.222(2) b consistent with molecular data.
An extended Judd-Ofelt model yields better calculated absorption intensities for Pr3+:YAG, especially the hypersensitive transition, and identifies additional viable laser wavelengths at 566 nm and 931 nm.
The study creates a self-consistent Stark broadening database for Al II lines in laser-produced aluminum plasma by referencing Al III widths measured under identical conditions.
Computes multi-level and multi-term collisional rates for He I fine-structure levels and terms in the 10830 Å, D3 5876 Å, and related triplet lines using the frozen-core approximation.
A sensitivity study shows Tsallis q-distributions alter ionization rates for He, Li, and Be, with q<1 suppressing and q>1 enhancing low-temperature rates, while separating cross-section and EEDF uncertainties and releasing the code.
A room-temperature flash lamp prototype is presented for generating VUV light at wavelengths matching noble liquid scintillators to test light sensors.
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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.