Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session S00: Poster Session III (4pm-6pm CDT)
4:00 PM,
Thursday, June 6, 2024
Room: Hall BC
Abstract: S00.00008 : New atomic data in heavy elements for the determination of kilonova ejecta opacity
Presenter:
Jerome Deprince
(University of Mons (UMONS))
Authors:
Jerome Deprince
(University of Mons (UMONS))
Sirine Ben Nasr
(UMONS)
Helena Carvajal Gallego
(UMONS)
Michel Godefroid
(ULB)
Stephane Goriely
(ULB)
Patrick Palmeri
(UMONS)
Pascal Quinet
(UMONS)
In this context, the present work focusses on large-scale atomic data and opacity computations for all heavy elements with Z ≥ 20, with a special effort on lanthanides and actinides, for a grid of typical KN ejecta conditions (temperature, density and time post-merger) between one day and one week after the merger (corresponding to the LTE photosphere phase of the KN ejecta). In order to do so, we used the pseudo-relativistic Hartree-Fock (HFR) method as implemented in the Cowan’s codes, in which the choice of the interaction configuration model is of crucial importance. In this contribution, HFR atomic data and opacities for all lanthanides and actinides will be presented. Besides, we will also discuss the contribution of every single element with Z ≥ 20 to the total KN ejecta opacity for several NSM models, depending on their Planck mean opacities and elemental abundances deduced from NSM simulations. The impact of considering such atomic-physics based opacity data instead of typical crude approximation formulae for the determination of the total KN ejecta opacity used in KN light curve modeling will also be evaluated.
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