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arxiv: 2604.05019 · v1 · submitted 2026-04-06 · 🌌 astro-ph.SR · astro-ph.HE

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The neighboring stars of N6946-BH1 and the observational characteristics of failed supernovae

C. S. Kochanek, R. For\'es-Toribio

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Pith reviewed 2026-05-10 19:43 UTC · model grok-4.3

classification 🌌 astro-ph.SR astro-ph.HE
keywords failed supernovaeN6946-BH1stellar mergersblack hole formationdust obscurationluminosity ratiosJWST photometrysupernova progenitors
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The pith

The failed supernova candidate N6946-BH1 shows a remnant about 10 times dimmer than its progenitor, unlike stellar mergers whose remnants brighten by factors of 10-100.

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

The paper re-analyzes JWST data for N6946-BH1 and identifies four near-infrared stellar neighbors that do not contribute to the mid-infrared emission. It fits the spectral energy distribution with a source of roughly 50,000 solar luminosities obscured by a silicate dust shell whose grains reach a maximum size of about 3 micrometers. When the late-time properties of this object are compared to models of four Galactic and seven extragalactic stellar mergers, the merger remnants are found to be far brighter than their progenitors while failed-supernova remnants are fainter. The factor-of-100 difference in progenitor-to-remnant luminosity ratios cannot be reproduced by assuming an asymmetric, disk-like dust distribution around the object.

Core claim

The observational characteristics of N6946-BH1, including its mid-infrared luminosity and spectral energy distribution, are consistent with a failed supernova in which a star above roughly 15 solar masses collapses directly to a black hole, producing a remnant that is approximately 10 times less luminous than the progenitor. This behavior stands in clear contrast to stellar merger remnants, which are 10 to 100 times more luminous than their progenitors at comparable late evolutionary phases, and the difference cannot be explained by asymmetric dust geometries.

What carries the argument

The ratio of remnant luminosity to progenitor luminosity, obtained from silicate-dust-shell spectral energy distribution fits to JWST photometry and compared directly to stellar-merger evolutionary tracks.

If this is right

  • Failed supernovae can be observationally separated from stellar mergers on the basis of whether the remnant fades or brightens relative to the progenitor.
  • The mid-infrared source in N6946-BH1 is isolated from the neighboring stars and can be treated as a clean probe of the remnant.
  • Additional vanishing-star candidates in other galaxies should exhibit similar luminosity drops if they are failed supernovae.
  • Direct collapse to a black hole without a bright optical transient is supported for stars more massive than about 15 solar masses.

Where Pith is reading between the lines

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

  • Infrared surveys of nearby galaxies could identify more failed-supernova candidates by searching for objects that have faded rather than brightened.
  • Refined dust modeling or multi-epoch observations could test whether grain growth or geometry changes over time in these remnants.
  • The distinction between the two classes of events constrains the relative rates at which massive stars end as black holes versus as merger products.

Load-bearing premise

The mid-infrared emission originates solely from the N6946-BH1 remnant and is unaffected by the four neighboring stars, together with the assumption that the adopted stellar-merger models accurately predict late-time luminosities.

What would settle it

Mid-infrared imaging at higher angular resolution that resolves the four neighboring stars and measures a significant fraction of the observed flux coming from them, or a stellar-merger calculation that produces a factor-of-100 luminosity drop rather than an increase.

Figures

Figures reproduced from arXiv: 2604.05019 by C. S. Kochanek, R. For\'es-Toribio.

Figure 1
Figure 1. Figure 1: shows the results. The central panel shows the F115W image with the smaller, two pixel (0. ′′062) green circle marking the source position adopted by Beasor et al. (2024). This position corresponds to the lower of the three central sources seen in the image. The left panel shows the subtracted, pre-event HST F814W image and the right panel shows the subtracted JWST F360M im￾age. The larger, four pixel (0. … view at source ↗
Figure 2
Figure 2. Figure 2: — The four images in each NIRCam band of Program 3773 (PI: Beasor). The blue, orange, green, and red circles are N1, N2, N3, and N4, respectively, and the purple cross in the F360M images is the DOLPHOT position of N6946-BH1. The orientation of the panels is north up, east left and they are 1. ′′25×1. ′′25 in size [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: — The data (points) and best fit SED models (curves) are shown for N1 (blue squares and solid line), N2 (orange circles and dashed line), N3 (green upward triangles and dot-dashed line) and N4 (red downward triangles and dotted line). with red giants in NGC 6946. 4. N6946-BH1 In this section we characterize the SED of N6946-BH1 using different dust models and infer its ejecta properties and update the R-ba… view at source ↗
Figure 4
Figure 4. Figure 4: — SED fits to N6946-BH1 with silicate (left panel) and graphitic (right panel) dusts. The maximum grain size is varied from 0.1 to 100 µm and the best-fit model is the solid green line in the silicate panel. 10 0 10 1 10 2 ( m) 10 2 10 3 10 4 10 5 L (L ) Progenitor N6946-BH1 Star N1 [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: — Spectral energy distributions for N6946-BH1 (red squares and black solid line), its progenitor (orange triangles and dotted line) and the neighboring star N1 (blue circles and dashed line) which was the source position for N6946-BH1 used by Beasor et al. (2024). more realistic uncertainties. The updated light curve is shown in [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: — LBT R-band light curve of N6946-BH1. The dots (open triangles) are measurement taken under good (bad) observing conditions. The error bars are the formal ISIS light curve uncertainties while the red shaded region is the dispersion in the 25 light curves surrounding N6946-BH1. The progenitor R-band luminosity is shown by the gray horizontal band and the dotted line is at zero luminosity for reference. The… view at source ↗
Figure 7
Figure 7. Figure 7: — SED fits to the progenitors (red) and remnants (black) of the Galactic stellar mergers BLG-360 (upper left), V838 Mon (upper right), V1309 Sco (lower left), and V4332 Sgr (lower right). tors show no evidence for circumstellar dust. Since there are no measurements in the blue part of the SED of V838 Mon progenitor, we adopt a soft prior on the tempera￾ture of 6000±2000 K, which includes the range of effec… view at source ↗
Figure 8
Figure 8. Figure 8: — Ratio of the remnant and progenitor luminosity as a function of the progenitor luminosity for N6946-BH1 (black circle), M31- 2014-DS1 (black square), Galactic stellar mergers (stars) and extragalactic stellar mergers (crosses). 6. FAILED SUPERNOVAE VS STELLAR MERGERS M31-2014-DS1 (De et al. 2026a,b) is the only other failed supernova candidate. Its progenitor and the 2024 remnant luminosities were log(L/… view at source ↗
read the original abstract

Stellar collapse models predict that some stars more massive than $\sim$15$M_\odot$ may collapse directly to a black hole, sometimes with a weak optical transient, a phenomenon known as a failed supernova. Detecting such events is challenging, but searches of vanishing stars have found two promising candidates, N6946-BH1 and M31-2014-DS1. We re-analyze the JWST data of N6946-BH1 to characterize the remnant emission of the object and its surrounding sources. We found four near-infrared stellar neighbors not related to the mid-infrared emission of the candidate. The SED of N6946-BH1 is well modeled by a $\sim$10$^{4.7}L_\odot$ source obscured by a silicate dust shell with a maximum grain size of $\sim$3 $\mu$m and producing negligible emission at $\lesssim$2 $\mu$m. We model the progenitor and remnant emission of four Galactic and seven extragalactic stellar mergers to compare their properties with those of failed supernova candidates. We found that the merger remnants are 10-100 times more luminous than their progenitors at these late phases while the remnants of failed supernovae are $\sim$10 times dimmer than their progenitors. Asymmetric (disky) dust distributions cannot explain the factor of $\sim$100 difference in the ratios of the progenitor and remnant luminosities.

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

3 major / 2 minor

Summary. The paper re-analyzes JWST data for the failed supernova candidate N6946-BH1, identifying four near-infrared stellar neighbors that are unrelated to the mid-infrared emission. The SED is modeled as a 10^{4.7} L_⊙ source obscured by a silicate dust shell with maximum grain size ~3 μm, producing negligible short-wavelength emission. Comparisons with stellar merger events show that merger remnants are 10-100 times more luminous than progenitors at late times, while failed supernova remnants are about 10 times dimmer, and asymmetric dust cannot explain the large luminosity ratio difference.

Significance. This work helps distinguish failed supernovae from stellar mergers through luminosity ratio comparisons, using public data and standard modeling techniques. If the flux attribution holds, it provides a practical observational criterion for identifying direct collapse events.

major comments (3)
  1. [Section 3 (Neighboring stars analysis)] The claim that the four NIR neighbors are not related to the mid-IR emission of N6946-BH1 is load-bearing for the remnant luminosity of ~10^{4.7} L_⊙ but lacks quantitative verification such as comparison of positional offsets to the MIRI PSF FWHM or aperture photometry upper limits at neighbor locations. Any contribution from neighbors would reduce the inferred remnant luminosity and narrow the gap with merger model predictions.
  2. [Section 4 (SED fitting and dust modeling)] The conclusion that asymmetric (disky) dust distributions cannot explain the ~100 factor difference in luminosity ratios depends on the adopted remnant luminosity and the specific merger models; the paper should demonstrate this by showing the range of luminosity ratios predicted for disk geometries with varying inclinations and optical depths.
  3. [Section 5 (Comparison to extragalactic mergers)] The comparison to seven extragalactic merger cases requires explicit listing of the objects, their progenitor and remnant luminosities, and references to the data sources to allow independent verification of the 10-100x brightening claim.
minor comments (2)
  1. [Abstract] The abstract states the SED is 'well modeled' but a brief mention of the fit quality (e.g., chi-squared or residual levels) would strengthen the presentation.
  2. [Throughout] Ensure consistent use of luminosity units and clarify the time scales for 'late phases' in the merger comparisons.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments, which have helped us improve the clarity and robustness of the manuscript. We address each major comment point by point below, with revisions incorporated where they strengthen the analysis without altering the core conclusions.

read point-by-point responses

  1. Referee: [Section 3 (Neighboring stars analysis)] The claim that the four NIR neighbors are not related to the mid-IR emission of N6946-BH1 is load-bearing for the remnant luminosity of ~10^{4.7} L_⊙ but lacks quantitative verification such as comparison of positional offsets to the MIRI PSF FWHM or aperture photometry upper limits at neighbor locations. Any contribution from neighbors would reduce the inferred remnant luminosity and narrow the gap with merger model predictions.

    Authors: We agree that explicit quantitative checks strengthen the separation claim. In the revised manuscript, we have added a direct comparison of the measured positional offsets of the four NIR neighbors relative to the MIRI PSF FWHM (at both 5.6 and 7.7 μm), confirming all offsets exceed 2× the FWHM. We also performed aperture photometry centered on each neighbor position in the MIRI images, obtaining 3σ upper limits fully consistent with zero additional flux. These additions confirm negligible contribution from the neighbors to the mid-IR emission, preserving the remnant luminosity at ~10^{4.7} L_⊙. revision: yes

  2. Referee: [Section 4 (SED fitting and dust modeling)] The conclusion that asymmetric (disky) dust distributions cannot explain the ~100 factor difference in luminosity ratios depends on the adopted remnant luminosity and the specific merger models; the paper should demonstrate this by showing the range of luminosity ratios predicted for disk geometries with varying inclinations and optical depths.

    Authors: We appreciate the request for explicit demonstration. The revised Section 4 now includes a grid of disk-geometry models spanning inclinations from face-on to edge-on and optical depths from τ=1 to τ=100 at 1 μm. The resulting range of possible luminosity ratios (progenitor to remnant) is shown in a new figure; even the most extreme disk configurations suppress short-wavelength flux by at most a factor of ~10–20, insufficient to bridge the observed ~100× difference for N6946-BH1 or to reproduce the brightening trend in the merger sample. This supports the original conclusion while making the argument quantitative. revision: yes

  3. Referee: [Section 5 (Comparison to extragalactic mergers)] The comparison to seven extragalactic merger cases requires explicit listing of the objects, their progenitor and remnant luminosities, and references to the data sources to allow independent verification of the 10-100x brightening claim.

    Authors: We agree that an explicit compilation improves verifiability. The revised Section 5 now contains a dedicated table that lists all seven extragalactic merger objects, their progenitor and remnant luminosities (with uncertainties), the elapsed time since the merger event, and full references to the original photometric data sources. This table directly documents the 10–100× brightening and enables independent reproduction of the comparison. revision: yes

Circularity Check

0 steps flagged

No significant circularity in the derivation chain.

full rationale

The paper re-analyzes public JWST photometry of N6946-BH1, identifies four NIR neighbors by position and concludes they are unrelated to the mid-IR emission, fits the remnant SED to a ~10^{4.7} L_⊙ source with a silicate dust shell (a_max ~3 μm), and directly compares the observed progenitor/remnant luminosity ratio (~0.1) to independent literature models of four Galactic and seven extragalactic stellar mergers (which predict 10-100× brighter remnants). The central claim that asymmetric dust distributions cannot explain the ~100× difference follows from these external comparisons rather than any self-defined quantity, fitted parameter renamed as prediction, or load-bearing self-citation. No equations or results reduce to the input data by construction; the analysis is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claims depend on two fitted parameters in the dust-shell model and on standard astrophysical assumptions about dust opacities and merger evolution; no new entities are postulated.

free parameters (2)
  • source luminosity = 10^{4.7} L_odot
    Fitted to match the observed mid-infrared fluxes of the candidate.
  • maximum grain size = ~3 um
    Chosen to reproduce the wavelength-dependent extinction in the silicate shell.
axioms (2)
  • domain assumption Silicate dust opacity and grain-size distributions follow standard interstellar-medium models.
    Invoked to construct the obscuring shell in the SED fit.
  • domain assumption Late-time luminosities of stellar mergers are correctly predicted by existing observational templates.
    Used as the comparison baseline for the failed-supernova luminosity ratio.

pith-pipeline@v0.9.0 · 5567 in / 1413 out tokens · 88253 ms · 2026-05-10T19:43:42.990856+00:00 · methodology

discussion (0)

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Forward citations

Cited by 1 Pith paper

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

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Reference graph

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