Mixing stochasticity relinquishes evidence for magnetorotational hypernovae

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ID: 324644
2026
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Abstract
Abstract A recent work claimed by fitting the observed elemental abundance pattern of a halo star with the total yields from single super-/hypernova events that only a magnetorotational hypernova event (a very energetic supernova event that also produces r-process elements) could be the source of the observed abundances. Here, we show that the star’s peculiar abundance pattern is better fitted within the framework of mixing stochasticity with yields from a normal core collapse supernova (ccSN; Energyexp ~1051 erg.) and a neutron star merger (NSM). The stochastic mixing model outperforms the hypernova fitting significantly, (r.m.s 0.24 vs 0.44) i.e., favours the composition from common events (ccSN + NSM) over the magnetorotational hypernova scenario. We also discuss the origin of the star and the possibility of enrichment of its birth cloud by both a ccSN and a NSM.
Reference Key
openalex_W7202175860 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Anmol Aggarwal, Ralph Schönrich
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1512
URL
https://doi.org/10.1093/mnras/stag1512
Keywords Keywords not found

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