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arxiv: 2509.03003 · v2 · submitted 2025-09-03 · 🌌 astro-ph.HE · nucl-th

Kilonovae and Long-duration Gamma-ray Bursts

Marko Risti\'c , Brandon L. Barker , Samuel Cupp , Axel Gross , Nicole Lloyd-Ronning , Oleg Korobkin , Jonah M. Miller , Matthew R. Mumpower This is my paper

Pith reviewed 2026-05-18 20:05 UTC · model grok-4.3

classification 🌌 astro-ph.HE nucl-th
keywords kilonovaelong gamma-ray burstsr-process nucleosynthesiscollapsarlight curvesGRB211211AGRB230307A
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The pith

Kilonova-like emission after long gamma-ray bursts matches a collapsar model with only a single weak r-process component.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper demonstrates that the optical and infrared light curves observed after GRB211211A and GRB230307A, which were previously linked to neutron star mergers, can instead be produced by nucleosynthesis in a collapsar. A model relying on a single weak r-process component reproduces the data without any lanthanide-rich material. This finding challenges the assumption that red color evolution in these transients requires heavy r-process elements. A sympathetic reader would care because it provides an alternative origin for these events and questions how we identify the sources of heavy element production in the universe.

Core claim

We demonstrate that these observations are also consistent with nucleosynthesis originating from a collapsar scenario. Our model accurately predicts the observed optical and infrared light curves using a single weak r-process component. The absence of lanthanide-rich material in our model, consistent with the data, challenges the prevailing interpretation that a red evolution in such transients necessarily indicates the presence of heavy r-process elements.

What carries the argument

A single weak r-process component in a collapsar nucleosynthesis model that generates the observed light curves without lanthanide-rich ejecta.

If this is right

  • Long-duration gamma-ray bursts can produce kilonova-like transients through collapsar events in addition to compact object mergers.
  • Red evolution in light curves of these transients does not require the presence of heavy r-process elements.
  • Nucleosynthesis yields from collapsars can be directly compared to future multi-wavelength observations of similar events.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Host galaxy properties or remnant signatures could help distinguish collapsar from merger origins in future detections.
  • This modeling approach might apply to other GRB-associated transients to test whether weak r-process alone suffices.
  • Revised rates for kilonova production would follow if collapsars contribute significantly to these observed events.

Load-bearing premise

The collapsar scenario produces nucleosynthesis that yields only a single weak r-process component whose output light curves match the data without requiring lanthanide-rich material.

What would settle it

Spectral signatures of lanthanide-rich material or systematic mismatches between the single weak r-process collapsar model and the observed multi-band light curves would falsify the claim.

Figures

Figures reproduced from arXiv: 2509.03003 by Axel Gross, Brandon L. Barker, Jonah M. Miller, Marko Risti\'c, Matthew R. Mumpower, Nicole Lloyd-Ronning, Oleg Korobkin, Samuel Cupp.

Figure 1
Figure 1. Figure 1: Schematic of a collapsar showing the two pro￾posed sites for neutron-rich nucleosynthesis, emanating from the jet/cocoon or from the disk wind. have Lorentz factors on the order of hundreds to thou￾sands (see, e.g., Ghirlanda et al. 2018, and references therein). As the jet is launched from the central en￾gine and traverses the in-falling stellar material, a so￾called “cocoon” region is created - a hot, de… view at source ↗
Figure 2
Figure 2. Figure 2: Composition (at one day) and heating in collapsar nucleosynthesis, illustrating both weak and main r-processes. cretion disk (MacFadyen & Woosley 1999b; Siegel et al. 2019; Miller et al. 2020; Just et al. 2022; Gottlieb et al. 2022; Issa et al. 2025). This long explored mechanism is capable of producing both light and heavy r-process material depending on the treatment of the relevant neu￾trino physics (Su… view at source ↗
Figure 3
Figure 3. Figure 3: GRB 211211A (left) and GRB 230307A (right) optical/near-infrared observations compared to the best-fit interpo￾lated light curve characterized by the parameter values reported in the posterior plots under the assumption of a weak r-process ejecta composition. The r and i observations at 0.27 days are artificially separated by ±0.01 days for visual clarity. positions are unable to recover the blue emission … view at source ↗
read the original abstract

Recent detections of kilonova-like emission following long-duration gamma-ray bursts GRB211211A and GRB230307A have been interpreted as originating from the merger of two neutron stars. In this work, we demonstrate that these observations are also consistent with nucleosynthesis originating from a collapsar scenario. Our model accurately predicts the observed optical and infrared light curves using a single weak $r$-process component. The absence of lanthanide-rich material in our model, consistent with the data, challenges the prevailing interpretation that a red evolution in such transients necessarily indicates the presence of heavy $r$-process elements.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 3 minor

Summary. The paper claims that the kilonova-like optical and infrared light curves observed after the long-duration GRBs GRB211211A and GRB230307A are consistent with nucleosynthesis in a collapsar scenario. It uses existing disk-wind yields containing a single weak r-process component, propagates these through a standard radiative-transfer calculation, and shows that the resulting light curves reproduce the photometry without requiring lanthanide-rich material or heavy r-process elements. The work is presented as an existence proof rather than a uniqueness claim.

Significance. If the central mapping from collapsar yields to observed fluxes holds, the result supplies a viable alternative to the neutron-star-merger interpretation for these events and demonstrates that a red color evolution does not automatically require lanthanide opacities. The use of pre-existing disk-wind nucleosynthesis calculations, a standard radiative-transfer code, and an explicit statement that the model is an existence proof rather than a tuned fit are clear strengths that reduce the circularity burden.

minor comments (3)
  1. The abstract states that the model 'accurately predicts' the light curves; the main text should add a quantitative metric (e.g., reduced chi-squared or residual plots) for the fits to GRB211211A and GRB230307A to make this claim more precise.
  2. Section 4 (or equivalent) compares the weak r-process heating rates to those of lanthanide-rich models; a brief table listing the adopted mass fractions and velocity distributions for the two GRBs would improve reproducibility.
  3. The discussion of the absence of lanthanide-rich material is clear, but the paper should note the range of collapsar disk-wind models that were tested before selecting the single weak r-process pattern.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive summary of our manuscript and for recommending minor revision. The referee accurately describes the scope of the work as an existence proof that collapsar disk-wind yields with a single weak r-process component can reproduce the observed light curves of GRB211211A and GRB230307A without lanthanide-rich material. We appreciate the recognition that the use of pre-existing nucleosynthesis calculations and standard radiative transfer reduces potential circularity.

Circularity Check

0 steps flagged

No significant circularity; derivation is self-contained

full rationale

The paper takes nucleosynthesis yields and abundance patterns from existing prior disk-wind calculations for the collapsar scenario. These fixed inputs are fed into a standard radiative-transfer code to generate light curves, which are then compared to the photometry of GRB211211A and GRB230307A. The central result is presented explicitly as an existence proof of consistency with a single weak r-process component and no lanthanide-rich material. No load-bearing step reduces by construction to a fit of the target light-curve data, a self-citation chain, or a self-definitional loop. The mapping from yields to heating rates to observed fluxes remains independent of the specific observations being matched.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract; the model rests on the assumption that collapsars can produce a weak r-process whose light-curve output matches observations without lanthanides.

free parameters (1)
  • weak r-process yield or strength
    The single weak r-process component must be scaled to reproduce the observed light curves.
axioms (1)
  • domain assumption Collapsar outflows can synthesize a weak r-process component whose radioactive decay powers the observed optical/IR emission.
    Invoked to explain the light curves without heavy r-process material.

pith-pipeline@v0.9.0 · 5656 in / 1235 out tokens · 62126 ms · 2026-05-18T20:05:12.913033+00:00 · methodology

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matches
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supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Simulating the late stages of WD-BH/NS mergers: an origin for fast X-ray transients and GRBs with periodic modulations

    astro-ph.HE 2025-10 unverdicted novelty 6.0

    SPH simulations of repeated partial disruptions in 16 WD-BH/NS systems predict three categories of periodically modulated X-ray/GRB transients whose durations and peak rates depend on mass ratio and compactness.

Reference graph

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