kilonovae

Radiative transfer/spectrum caclulation of lines in the kilonovae.

The code presented here has been used in the following publications:

• Arya et al. (2026) "Strontium and helium in the kilonova AT2017gfo: Origin of the 1µm feature via NLTE calculations". arXiv:2604.05812

Atomic Data

please see the relevant publication(s) for full details and citations.

Collision Rates

are from Mulholland et al. (2024) MNRAS

Recombination Rates

Sr III $\to$ II and IV $\to$ III cross-sections were computed by Niall McElroy and provided to us by Connor Ballance (priv. communication)

Photoionization Rates

provided by David Dougan (priv. comm., 2025)

Spectra

The spectral series used in the work are accessible at this GitHub page