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Evidence for Asymmetric Ejecta and Circumstellar Material in SN 2023ixf Inferred from Extensive Nebular-phase Observations

T0 review · 2 major / 4 minor · reviewed 2026-07-12 · grok-4.5

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Pith's one-line read Nebular spectra of SN 2023ixf show the ejecta are asymmetric with at least two Ni-rich plumes and a disk-like CSM.

desk verdict Dense multi-epoch optical–MIR coverage of SN 2023ixf yields a clean geometric template (disk-like CSM + ≥2 Ni plumes) that is new for this object and useful for 3-D models; dust is the main unmodeled soft spot but does not break the central claim. read the letter →

arxiv 2607.02859 v1 pith:MZSDFD3U submitted 2026-07-03 astro-ph.HE

Brian Hsu , Nathan Smith , K. Azalee Bostroem , Jeniveve Pearson , David J. Sand , Lindsey A. Kwok , Jennifer E. Andrews , Bhagya M. Subrayan
show 29 more authors
Griffin Hosseinzadeh Manisha Shrestha Conor Ransome Moira Andrews Collin T. Christy Yize Dong Joseph Farah Alexei V. Filippenko Noah Franz Jared A. Goldberg Estefania Padilla Gonzalez Claudia P. Gutiérrez Emily Hoang D. Andrew Howell Saurabh W. Jha Réka Kőnyves-Tóth Michael Lundquist Curtis McCully Darshana Mehta Nicolas E. Meza Retamal Megan Newsome Aravind P. Ravi Jeonghee Rho Giacomo Terreran Stefano Valenti Sergiy Vasylyev X.-F. Wang Kathryn Wynn Yi Yang
This is my paper
classification astro-ph.HE
keywords TypeIIsupernovaenebularspectroscopyejectaasymmetrycircumstellarmaterialnickelplumesJWSTSN2023ixf
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

The paper uses a long optical-to-mid-infrared spectral time series of the nearby Type II supernova 2023ixf, from roughly three months to two years after explosion, to map the geometry of both the exploded star and the gas that surrounded it. The H-alpha line evolves from a decay-powered core into high-velocity "horns" and an intermediate-width component; that intermediate component is recovered simply by scaling an early radioactive spectrum against a late shock-dominated spectrum, showing that the ejecta have crashed into dense, initially aspherical circumstellar material already swept up by the forward shock. At the same epochs, Mg I, Na I and neutral nickel lines are double-peaked, which the authors interpret as emission from at least two large nickel-rich plumes that heat the inner ejecta unevenly. Together the data support a picture of a disk-like CSM plus an intrinsically asymmetric explosion, rather than a spherical wind and spherical ejecta. A sympathetic reader cares because the same geometry appears in another nearby supernova observed with JWST and matches the large-scale plumes predicted by three-dimensional explosion simulations, so the result may be common rather than exotic.

What carries the argument

Empirical profile decomposition: the intermediate-epoch H-alpha (and Pa-alpha, Br-alpha) is reconstructed by scaling and summing an early, mostly decay-powered spectrum against a late, mostly shock-powered spectrum; the same geometric templates (skewed Gaussians for double-peaked metal lines) are then applied to Mg I, Na I and [Ni I].

What would settle it

A higher-resolution mid-infrared spectrum that either resolves clear double peaks in the ionized metal lines or shows that those lines remain single-peaked after resolution effects are removed, together with multi-wavelength radiative-transfer models that include clumpy dust and still fail to erase the intermediate-width H-alpha component.

Watch

Extended reading notes

Core claim

At intermediate epochs the H-alpha profile of SN 2023ixf is the linear sum of an early decay-powered component and a late shock-powered component; the residual intermediate-width emission is produced by ejecta interacting with dense, initially aspherical CSM that has already been swept up. Concurrent double-peaked Mg I 1.504 µm, Na I 2.206 µm and [Ni I] 3.12 µm lines require an asymmetric distribution of Ni-rich material consisting of at least two large plumes.

Load-bearing premise

The observed blue-red line asymmetries are treated as mostly intrinsic geometry rather than dust attenuation, even though carbon monoxide and thermal infrared excess already show that dust is present and growing.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

2 major / 4 minor

Summary. The manuscript presents a large optical+NIR spectral time series of the nearby Type II SN 2023ixf from +89 d to +749 d, supplemented by JWST NIRSpec/MIRI spectra. It documents the emergence of high-velocity “CSM horns” in H and He lines, reconstructs the intermediate-epoch (~+375 d) Hα (and Paα/Brα) profile as a linear combination of an early, largely decay-powered spectrum and a late, largely shock-powered spectrum, and thereby isolates an intermediate-width component attributed to ejecta interacting with previously aspherical dense CSM that has been swept up. Double-peaked profiles of Mg I 1.504 µm, Na I 2.206 µm and [Ni I] 3.12 µm are fitted with skewed Gaussians (plus a Lorentzian for the red [Ni I] peak) and interpreted, together with more symmetric MIR ionized lines, as evidence for at least two large Ni-rich plumes that heat the ejecta inhomogeneously. The authors propose a composite geometry consisting of a disk/torus-like CSM and a multi-plume ejecta.

Significance. If the geometric inferences hold, the work supplies one of the most complete multi-wavelength empirical maps of ejecta and CSM structure for a well-observed SN II, directly comparable to 3-D neutrino-driven simulations that produce Ni plumes and RTI fingers. The Hα scaling exercise is transparent and essentially parameter-free in shape, the double-peaked NIR/MIR fits use standard functional forms, and the data (including flux-calibrated spectra) are promised for public release. These are genuine strengths that make the paper a useful reference for both observers and modelers, even if some aspects of the dust-versus-geometry discussion remain provisional.

major comments (2)
  1. §5 (line-profile fits) and §6.3: The empirical fits deliberately omit dust absorption/scattering even though CO first-overtone and fundamental bands plus thermal IR excess already demonstrate that dust is present by the epochs being modelled. The paper correctly notes the weak wavelength dependence of red-wing suppression among Hα/Paα/Brα (Fig. 5) as evidence against pure dust attenuation, yet a quantitative estimate of the residual optical-depth effect on the double-peaked Mg I 1.504 µm and [Ni I] 3.12 µm profiles (or a simple clumpy-dust attenuation applied to the best-fit components) is still needed to show that the “at least two large Ni-rich plumes” conclusion is robust rather than provisional. Without it the central geometric claim rests on an assumption that the authors themselves flag as the main uncertainty.
  2. §4.1 and Fig. 8: The reverse-shock luminosity is computed under fixed Ṁ ≈ 10^{-4} M_⊙ yr^{-1}, v_wind = 25 km s^{-1} and a uniform draw of V_ej between the blue peak and the 99 % velocity edge. While the resulting L_sh ∝ t^{-0.3} trend matches independent UV and SED estimates, the adopted Ṁ is acknowledged to be extreme for normal RSGs; a short sensitivity test (varying Ṁ by a factor of a few or allowing a non-steady wind) would demonstrate that the claimed transition to shock dominance near +600 d is not an artifact of those fixed parameters.
minor comments (4)
  1. Fig. 4 and §3.1: The velocity zero-points for the [O I] and [Ca II] doublets are defined with respect to the bluer component; a brief explicit statement in the caption would avoid confusion when comparing to single-line species.
  2. §5.2 and Appendix A: The discussion of MIRI/LRS resolution smoothing of possible double peaks is useful; adding the actual resolving power (or FWHM in km s^{-1}) at each MIR line wavelength would make the argument fully quantitative.
  3. Table 1 / Table 2: A few exposure times and instrument modes are listed without the corresponding airmass or seeing; these are minor but would aid reproducibility.
  4. Throughout: Occasional typographical slips (e.g., “aspherical” vs. “asymmetric” usage is carefully defined early but occasionally blurred later; “Heiemission” missing space) should be cleaned in proof.

Circularity Check

0 steps flagged · score 2.0 of 10

Data-driven empirical decomposition and line-profile fits; only minor non-load-bearing self-citations of prior SN 2023ixf papers by overlapping authors.

full rationale

The paper's central claims are empirical inferences from new multi-epoch optical/NIR/MIR spectra, not first-principles derivations. The Hα reconstruction in §4.2 scales two independently observed templates (+138 d decay-dominated and +749 d shock-dominated) by the separately calculated L_sh/L_decay ratio at +378 d (itself from measured Hα velocities plus assumed constant Ṁ and v_wind from external X-ray/early-spectra constraints); the match is a consistency check that reveals an intermediate-width residual already present in the late template, not a prediction forced by construction. Double-peaked Mg I 1.504 µm, Na I 2.206 µm and [Ni I] 3.12 µm profiles are fit with free skewed-Gaussian/Lorentzian components (§5.1) whose parameters are then interpreted against 3-D simulation expectations; no uniqueness theorem or fitted parameter is re-labeled a prediction. Self-citations (Bostroem+26, Jacobson-Galán+25, etc.) supply comparison L_sh values and early-time context but are not required for the geometric conclusions, which rest on the new line profiles. Dust is acknowledged as a caveat (§6.3) rather than hidden. No self-definitional loop, no fitted-input-as-prediction, and no load-bearing uniqueness imported from the authors' prior work. Score 2 only for the presence of ordinary overlapping-author citations that do not close any logical circle.

Assumptions & free parameters 4 free parameters · 4 assumptions · 0 invented entities

The central geometric claim rests on a handful of literature-derived numbers (mass-loss rate, wind velocity, 56Ni mass) treated as fixed, standard assumptions of homologous expansion and LTE line ratios, and the modeling choice to omit dust radiative transfer while still interpreting residual asymmetries as intrinsic. No new particles or forces are invented; the “plumes” and “disk-like CSM” are geometric configurations inferred from data rather than postulated entities.

free parameters (4)
  • wind mass-loss rate Ṁ = ≈10^{-4} M_⊙ yr^{-1}
    Fixed at ≈10^{-4} M_⊙ yr^{-1} from X-ray literature to compute reverse-shock luminosity L_sh; directly scales the shock-power curve used to argue the transition at ~+600 d.
  • wind velocity v_wind = 25 km s^{-1}
    Fixed at 25 km s^{-1} from early high-resolution spectra; enters the same L_sh calculation.
  • 56Ni mass M_Ni = 0.058 M_⊙
    Adopted as 0.058 M_⊙ (with T_0 = 264.6 d) from prior work to normalize the radioactive decay luminosity against which shock power is compared.
  • ejecta velocity sampling for reverse shock = U(|V_peak,blue|, |V_max,blue|)
    Monte-Carlo uniform draw between blue peak and 99 % blue edge of Hα; the resulting L_sh error bars depend on this choice.
assumptions (4)
  • domain assumption Homologous expansion and power-law density profiles (s=2 wind, n=12 RSG envelope) for reverse-shock luminosity formula
    Invoked in §4.1 via Fransson et al. (1996) analytic formalism; standard but not re-derived.
  • domain assumption LTE intensity ratios for [O I] 6300/6364 and [Ca II] 7291/7324 in the optically thin limit
    Used in §§5.3–5.4 to interpret optical-depth evolution; classical atomic-physics result.
  • ad hoc to paper Dust attenuation is secondary to intrinsic geometry for the observed blue–red asymmetries at the epochs fitted
    Explicit modeling choice in §5 and discussed in §6.3; the paper notes CO and IR excess but does not include dust RT in the line fits that support the plume/disk claim.
  • domain assumption MIRI/LRS wavelength calibration correction of Kwok et al. (2025)
    Applied to place [Ni II] 6.636 µm and [Ar II] 6.985 µm; affects measured centroids of key MIR lines.

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Cite this review

Pith. "Pith review of Evidence for Asymmetric Ejecta and Circumstellar Material in SN 2023ixf Inferred from Extensive Nebular-phase Observations." pith.science (2026). https://pith.science/paper/MZSDFD3U

@misc{pith2026260702859,
  author       = {Pith},
  title        = {Pith review of: Evidence for Asymmetric Ejecta and Circumstellar Material in SN 2023ixf Inferred from Extensive Nebular-phase Observations},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/MZSDFD3U}},
  note         = {Machine review of arXiv:2607.02859}
}
abstract

We present extensive optical and near-infrared (NIR) observations of the nearby Type II supernova (SN II) 2023ixf in the nebular phase from +89 days to +749 days after explosion, supplemented with NIR and mid-infrared (MIR) spectroscopy from the James Webb Space Telescope. The H$\alpha$ emission profile shows complex evolution, with the emergence of high-velocity components consistent with the outer ejecta interacting with extended, low-density circumstellar material (CSM). We find that the H$\alpha$ profile at an intermediate epoch (around +375 d) can be reconstructed by scaling an earlier decay-powered component and a later-phase shock-powered component, which revealed an additional intermediate-width component. This is consistent with the ejecta crashing into the initially aspherical dense CSM that has been swept-up by the forward shock. In the NIR, we find double-peaked emission from Mg I $1.504\ {\rm \mu m}$, Na I $2.206\ {\rm \mu m}$, and [Ni I] $3.12\ {\rm \mu m}$ between +200 d and +374 d, consistent with an asymmetric distribution of Ni-rich material that heats the ejecta inhomogeneously. We posit a disk-like CSM geometry and an ejecta geometry in which at least two large Ni-rich plumes lead to the observed line-profile diversity.

Figures

Figures reproduced from arXiv: 2607.02859 by the authors.

Figure 1
Figure 1. Optical (UBgV rizs) light curves of SN 2023ixf from LCO, corrected for Milky Way and host extinctions. The error bars of most observed magnitudes are smaller than the marker size (≲ 0.1 mag). The LCO photometry up to the first year (∼ 360 days) of SN 2023ixf’s evolution was previously presented by B. Hsu et al. (2025). New photometry presented in this work is highlighted in the gray shaded box. The times of the spec… view at source ↗
Figure 2
Figure 2. Optical spectra of SN 2023ixf from +89 days to +749 days after explosion, corrected for E(B − V )tot = 0.0387 mag and calibrated to optical photometry in [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 2
Figure 2. (continued) Jacobson-Gal´an et al. 2025; A. J. Nayana et al. 2025) and radiative-transfer models (L. Dessart et al. 2023a, 2026b) [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figures from the paper (12 more)
Figure 3
Figure 3. Figure 3: NIR spectra of SN 2023ixf from +200 days to +695 days after explosion, corrected for E(B − V )tot = 0.0387 mag. Spectra with an asterisk are either published in S. H. Park et al. (2025) or supplemented from previous studies of SN 2023ixf (S. H. Park et al. 2025; W. V. …
Figure 4
Figure 4. Figure 4: Temporal evolution of selected prominent emission lines in SN 2023ixf. The rest-frame zero-velocity is marked with a black dashed line. The velocity of [O I] λλ6300, 6364 is measured with respect to the λ6300 line and the velocity of [Ca II] λλ7291, 7324 is measured wi…
Figure 5
Figure 5. Figure 5: Line-profile comparison of several prominent emission features in SN 2023ixf at three different epochs, separated into four categories. A linear pseudocontinuum is subtracted from each line profile before normalizing to the emission peak. As we do not have optical or N…
Figure 6
Figure 6. Figure 6: Line profiles of possible emission from [C I] λ8727 and [C I] λλ9824, 9850 at +307 d and +349 d. These pro￾files are not normalized to the local pseudocontinua owing to blending with nearby emission (e.g., Ca II NIR triplet in the case of [C I] λ8727). The profile of […
Figure 7
Figure 7. Figure 7: Line-profile comparison of several features in SN 2023ixf at around +250 d and +375 d after explosion. The optical and NIR spectra used in each panel are within ±7 days from each other. The vertical dashed lines denote the two emission peaks of [Ni I] 3.12 µm at −1500 …
Figure 8
Figure 8. Figure 8: Top: The evolution of shock-power luminosity in SN 2023ixf (gray circles) derived from the Hα velocity, as￾suming a constant mass-loss rate of M˙ = 10−4 M⊙ yr−1 and a wind velocity of vwind = 25 km s−1 . The error bars correspond to 1σ uncertainty bounds calculated fro…
Figure 9
Figure 9. Figure 9: Line profiles of Hα, Paα, and Brα around +375 d. The profiles at this intermediate epoch (where both decay-powered emission and shock-powered emission are present) can be fit by scaling and combining line profiles from an earlier epoch with mostly decay-powered emissio…
Figure 10
Figure 10. Figure 10: Line-profile fits for double-peaked Mg I 1.504 µm, Na I 2.206 µm, and [Ni I] 3.12 µm emission lines in SN 2023ixf at different epochs shown in solid gray. The line models for Mg I 1.504 µm and the nearby Mg I 1.488 µm are shown in dashed black. We display the similarl…
Figure 11
Figure 11. Figure 11: Line-profile fits for broad and symmetric emission from IMEs ([Ar II] 6.985 µm and [Ne II] 12.813 µm) and IGEs ([Ni I] 11.308 µm, [Ni II] 6.636 µm, and [Co II] 10.521 µm) in SN 2023ixf at +253 d and +374 d shown in solid gray. All of these emission lines are well fit …
Figure 12
Figure 12. Figure 12: Line-profile fits for [O I] λ5577 and [O I] λ6300, 6364 in SN 2023ixf at different epochs. The models for individual lines are shown in dashed black, and the composite fits are in solid gray. The [O I] λ5577 emission is well matched by a single Gaussian, with an addit…
Figure 13
Figure 13. Figure 13: Line-profile fits for [Ca II] λλ7291, 7324 in SN 2023ixf at three different epochs. The fits for individual lines are shown in dashed black, and the composite fits are in solid gray. The [Ca II] emission is heavily blended with several weak lines from [Fe II] and [Ni …
Figure 14
Figure 14. Figure 14: The inferred ejecta and CSM structure for SN 2023ixf from our line-profile fits. Various shock-powered emission lines indicate the presence of an intermediate-width component from the ejecta crashing into swept-up, aspherical CSM. Various double-peaked profiles indica…

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