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Where Has All the R-process Gone? Timescales for Gamma-Ray Burst Kilonovae to Enrich Their Host Galaxies

  • Authors: Anya E. Nugent, Alexander P. Ji, Wen-fai Fong, Hilay Shah, Freeke van de Voort

Anya E. Nugent et al 2025 The Astrophysical Journal 982 .

  • Provider: AAS Journals

Caption: Figure 6.

CDFs of the percentage of stellar mass of the host galaxy that is enriched by the observed GRB-KN sample (penrich) at z = 0 (solid blue) and by the full GRB-KN and short GRB sample (solid gray). We show the same for penrich 5 Gyr after enrichment (dashed lines). We find that the median penrich = 13% for the GRB-KN sample, suggesting that the majority of their r-process will be lost to the CGM or IGM. The median penrich for the full sample is 59%. Given that there is a significant fraction of hosts that have ≲50% enrichment, this suggests that not all environments are capable of being strongly enriched from a single event.

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