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Research Paper#Astrophysics, Kilonova, Nucleosynthesis🔬 ResearchAnalyzed: Jan 3, 2026 15:43

Revised Lanthanide Abundance in Kilonova AT 2017gfo

Published:Dec 30, 2025 14:32
1 min read
ArXiv

Analysis

This paper improves the modeling of the kilonova AT 2017gfo by using updated atomic data for lanthanides. The key finding is a significantly lower lanthanide mass fraction than previously estimated, which impacts our understanding of heavy element synthesis in neutron star mergers.
Reference

“The model necessitates $X_{ extsc{ln}} \approx 2.5 imes 10^{-3}$, a value $20 imes$ lower than previously claimed.”

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Research Paper#Astrophysics, Gamma-Ray Bursts, Kilonovae, Neutron Star Mergers🔬 ResearchAnalyzed: Jan 3, 2026 18:57

Progenitor Properties of Merger-Driven Gamma-Ray Bursts

Published:Dec 29, 2025 10:34
1 min read
ArXiv

Analysis

This paper investigates the properties of the progenitors (Binary Neutron Star or Neutron Star-Black Hole mergers) of Gamma-Ray Bursts (GRBs) by modeling their afterglow and kilonova (KN) emissions. The study uses a Bayesian analysis within the Nuclear physics and Multi-Messenger Astrophysics (NMMA) framework, simultaneously modeling both afterglow and KN emission. The significance lies in its ability to infer KN ejecta parameters and progenitor properties, providing insights into the nature of these energetic events and potentially distinguishing between BNS and NSBH mergers. The simultaneous modeling approach is a key methodological advancement.
Reference

“The study finds that a Binary Neutron Star (BNS) progenitor is favored for several GRBs, while for others, both BNS and Neutron Star-Black Hole (NSBH) scenarios are viable. The paper also provides insights into the KN emission parameters, such as the median wind mass.”

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Physics#Atomic Physics, Photoionization🔬 ResearchAnalyzed: Jan 3, 2026 19:53

M-shell Photoionization of Lanthanum Ions

Published:Dec 27, 2025 12:22
1 min read
ArXiv

Analysis

This paper presents experimental measurements and theoretical calculations of the photoionization of singly charged lanthanum ions (La+) using synchrotron radiation. The research focuses on double and up to tenfold photoionization in the M-shell energy range, providing benchmark data for quantum theoretical methods. The study is relevant for modeling non-equilibrium plasmas, such as those found in kilonovae. The authors upgraded the Jena Atomic Calculator (JAC) and performed large-scale calculations, comparing their results with experimental data. While the theoretical results largely agree with the experimental findings, discrepancies in product-ion charge state distributions highlight the challenges in accurately modeling complex atomic processes.
Reference

“The experimental cross sections represent experimental benchmark data for the further development of quantum theoretical methods, which will have to provide the bulk of the atomic data required for the modeling of nonequilibrium plasmas such as kilonovae.”

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