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Discovery of sulfur oxides in the ejecta of a B[e] supergiant

T0 review · 2 major / 2 minor · reviewed 2026-07-03 · grok-4.3

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Pith's one-line read Sulfur oxides are detected for the first time in the ejecta of a B[e] supergiant, with abundances matched by chemical models in 10,000 years and an isotopic ratio indicating photochemistry-driven fractionation.

desk verdict The paper's real contribution is the ALMA detection of SO and SO2 around HD 87643, but the short-timescale chemistry and isotopic fractionation claims depend on modeling choices that the abstract leaves unspecified. read the letter →

arxiv 2607.02191 v1 pith:GHAIXXHP submitted 2026-07-02 astro-ph.SR

C. Bordiu , J. Ricardo Rizzo , D. Navarro-Almaida , A. Fuente , F. Bufano , G. Umana , S. Loru , A. C. Ruggeri
show 7 more authors
C. Buemi F. Cavallaro L. Cerrigone A. Ingallinera P. Leto S. Riggi C. Trigilio
This is my paper
classification astro-ph.SR
keywords B[e]supergiantssulfuroxidescircumstellarchemistryisotopicfractionationALMAobservationsHD87643moleculargas
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 reports the first detection of SO and SO2 molecules in the circumstellar environment of the B[e] supergiant HD 87643 using ALMA observations. These sulfur oxides appear in an oxygen-rich setting where chemical models reproduce the observed SO2 abundance relative to H2 on timescales as short as 10,000 years. The data also show an unusually low 32SO/33SO ratio that the authors link to mass-independent fractionation caused by intense ultraviolet radiation. This points to a rapidly evolving, out-of-equilibrium chemistry phase around such stars despite their strong radiation fields. The results suggest B[e] supergiants can act as sites for studying sulfur chemistry under extreme conditions and may connect to isotopic processes in the early solar system.

What carries the argument

ALMA spectral detections of SO and SO2 lines in the ejecta of HD 87643, interpreted through time-dependent chemical models that track sulfur-bearing species under high-UV, oxygen-rich conditions.

What would settle it

A spatially resolved map of the molecular emission combined with measurements of additional sulfur isotopes or direct constraints on local density and temperature would test whether the abundance and fractionation claims hold.

Watch

Extended reading notes

Core claim

The detection of SO and SO2 marks the first such molecules in an early-type evolved massive star. The SO2 fractional abundance relative to H2 is reproducible by chemical modelling in timescales as short as ~10^4 yr in an oxygen-rich environment. An anomalously low 32SO/33SO is attributed to mass-independent fractionation driven by intense photochemistry, mirroring processes proposed to explain 33S excesses in the atmosphere of the Archaean Earth.

Load-bearing premise

The chemical models assume specific physical conditions and an oxygen-rich environment allow the observed abundances to be reproduced on short timescales, while the isotopic ratio interpretation assumes photochemistry is the dominant fractionation mechanism without competing processes.

Editorial extensions

If this is right

  • The detected molecules trace a short-lived, rapidly evolving phase of out-of-equilibrium chemistry around the star.
  • B[e] supergiants can sustain complex molecular chemistry in their disks despite intense UV fields.
  • These environments provide laboratories for studying sulfur chemistry and isotopic fractionation under extreme radiation.
  • The findings open avenues to investigate fractionation processes that may relate to isotopic signatures in the early geological record.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Similar molecular detections could be feasible in other high-mass evolved stars if observed at comparable sensitivity and resolution.
  • The photochemistry-driven fractionation mechanism might operate in additional irradiated astrophysical settings beyond B[e] supergiants.
  • Circumstellar material from these stars could deliver fractionated sulfur to forming planetary systems.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

2 major / 2 minor

Summary. The paper reports ALMA detections of SO and SO2 (plus other sulfur-bearing species) in the circumstellar environment of the B[e] supergiant HD 87643, claimed as the first such molecules in an early-type evolved massive star. Chemical modeling is presented as reproducing the observed high SO2/H2 fractional abundance on timescales as short as ~10^4 yr in an oxygen-rich environment, interpreted as tracing a short-lived out-of-equilibrium phase. An anomalously low 32SO/33SO ratio is measured and attributed to mass-independent fractionation from intense photochemistry, with suggested links to Archaean Earth processes.

Significance. If the detections, modeling, and isotopic interpretation hold after details are provided, the result would establish B[e] supergiants as viable sites for complex sulfur chemistry despite strong UV fields, with potential as laboratories for extreme photochemistry and fractionation mechanisms. The short-timescale claim and isotopic attribution could inform models of circumstellar evolution in massive stars.

major comments (2)
  1. [Chemical modelling] Chemical modelling section: the reproduction of the observed SO2/H2 ratio in ~10^4 yr is presented as supporting a short-lived phase, but this hinges on specific (unstated) choices for density, temperature, UV intensity, and the oxygen-rich assumption; without showing these are independently constrained by observations of HD 87643 rather than tuned to match, the timescale conclusion is not load-bearing.
  2. [Isotopic ratio analysis] Isotopic analysis section: the attribution of the low 32SO/33SO to mass-independent fractionation by photochemistry assumes this channel dominates without quantitative exclusion of competing processes (e.g., other fractionation mechanisms); this is central to the fractionation claim but lacks the required comparison.
minor comments (2)
  1. The abstract refers to 'other sulfur-bearing species' without naming them; explicit identification would aid clarity.
  2. Error analysis, baseline comparisons, and full dataset details for the ALMA detections are referenced in the reader's assessment but not visible here; their inclusion is needed for reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their insightful comments on our manuscript. We address each major comment below and will incorporate revisions to strengthen the presentation of our results.

read point-by-point responses

  1. Referee: [Chemical modelling] Chemical modelling section: the reproduction of the observed SO2/H2 ratio in ~10^4 yr is presented as supporting a short-lived phase, but this hinges on specific (unstated) choices for density, temperature, UV intensity, and the oxygen-rich assumption; without showing these are independently constrained by observations of HD 87643 rather than tuned to match, the timescale conclusion is not load-bearing.

    Authors: We agree that the chemical modeling parameters should be more explicitly tied to observational constraints. In the revised version, we will add a new subsection in the chemical modelling section that details the sources of the adopted density, temperature, UV intensity, and oxygen-rich conditions. These will be justified using existing observational data on HD 87643, including its spectral energy distribution, disk properties from previous studies, and typical values for B[e] supergiant environments. This will demonstrate that the ~10^4 yr timescale is not the result of tuning but follows from observationally motivated inputs. revision: yes

  2. Referee: [Isotopic ratio analysis] Isotopic analysis section: the attribution of the low 32SO/33SO to mass-independent fractionation by photochemistry assumes this channel dominates without quantitative exclusion of competing processes (e.g., other fractionation mechanisms); this is central to the fractionation claim but lacks the required comparison.

    Authors: The manuscript attributes the low ratio to photochemistry based on the intense UV field in the B[e] supergiant environment, which is distinct from other astrophysical settings. However, to address the referee's concern, we will revise the isotopic analysis section to include a quantitative comparison with other potential fractionation mechanisms, such as equilibrium fractionation and ion-molecule reactions, using literature values to show why they are unlikely to produce the observed ratio under the conditions of HD 87643. This will provide a stronger basis for the mass-independent fractionation claim. revision: yes

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; modelling presented as independent reproduction under stated conditions

full rationale

The abstract reports an observational detection of SO and SO2 and states that chemical modelling reproduces the observed SO2/H2 abundance on ~10^4 yr timescales in an oxygen-rich environment. No equations, fitted parameters, or self-citations are quoted that reduce this reproduction to a tautology or input fit by construction. The isotopic attribution is an interpretive claim rather than a derived result shown to equal its premises. The derivation chain therefore remains self-contained against external benchmarks with no load-bearing step collapsing to its own inputs.

Assumptions & free parameters 1 free parameters · 1 assumptions · 0 invented entities

The central claim rests on observational detection plus chemical modeling whose parameters and assumptions are not detailed in the abstract.

free parameters (1)
  • chemical model parameters
    Reaction rates, initial abundances, or physical conditions in the chemical model are adjusted to reproduce the observed SO2 abundance on short timescales.
assumptions (1)
  • domain assumption The circumstellar environment is oxygen-rich
    Invoked to allow the chemical model to match the high SO2 abundance.

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Cite this review

Pith. "Pith review of Discovery of sulfur oxides in the ejecta of a B[e] supergiant." pith.science (2026). https://pith.science/paper/GHAIXXHP

@misc{pith2026260702191,
  author       = {Pith},
  title        = {Pith review of: Discovery of sulfur oxides in the ejecta of a B[e] supergiant},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/GHAIXXHP}},
  note         = {Machine review of arXiv:2607.02191}
}
abstract

B[e] supergiants represent a rare class of luminous, evolved massive stars surrounded by dusty circumstellar disks. Since their intense UV fields were long thought to sterilize their surroundings, molecular detections beyond carbon monoxide have remained elusive, leaving their chemical reservoirs largely unexplored. Whether these environments can sustain a complex molecular chemistry is a fundamental question with significant astrochemical implications. Here we report the detection of chemically rich molecular gas surrounding the B[e] supergiant HD~87643, using ALMA observations. Our data reveal the presence of the sulfur oxides SO and SO$_2$ and other sulfur-bearing species, marking the first detection of these molecules in an early-type evolved massive star. We find a high fractional abundance of SO$_2$ relative to H$_2$, which our chemical modelling can reproduce in timescales as short as $\sim$10$^4$ yr in an oxygen-rich environment. These results indicate that the detected molecules trace a short-lived, rapidly evolving phase of out-of-equilibrium chemistry. Furthermore, we measure an anomalously low $^{32}$SO/$^{33}$SO, that we attribute to mass-independent fractionation driven by intense photochemistry. This mechanism mirrors processes proposed to explain the $^{33}$S excesses in the atmosphere of the Archaean Earth. Our findings suggest that B[e] supergiants could serve as unique laboratories for studying sulfur chemistry under extreme radiation conditions, opening potential avenues to investigate the fractionation processes that shaped the isotopic signatures found in the early geological record.

Figures

Figures reproduced from arXiv: 2607.02191 by the authors.

Figure 1
Figure 1. CO and 13CO emission in the field of HD 87643. Left: RGB composite image from VPHAS+ showing the star and its surrounding nebula, with Hα mapped to blue, u + g to green, and r + i to red. ALMA 1.3 mm continuum contours are overlaid in green at levels of 50, 100, 150, and 200 mJy beam−1 . Center : CO J = 2 → 1 moment 0 map integrated over the velocity range −32 to −5 km s−1 , with contours at 15, 20, 30, 50, 70, and … view at source ↗
Figure 2
Figure 2. Beam-averaged spectra toward HD 87643. The top panel displays the full spectral coverage, with zoomed views of individual spectral windows below. The x-axes of spectral windows 18 and 20 are broken to omit line-free regions. Shaded grey areas indicate the 3σ noise level. Blue dashed lines indicate identified molecular species at a velocity of −18 km s−1 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Spectral energy distribution of HD 87643. The magenta points show the dereddened photometric data with associated error bars. Individual components of the best-fit model are indicated by the colored lines: stellar blackbody (blue), hot and cold disks (orange and red), and stellar wind (green). The combined model is shown in black, with the uncertainty represented by the grey shaded region. we performed a chemical mo… view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: Top: grid of models with varying gas densi￾ties and chemical time, and their corresponding distances of disagreement (Eq.1), for T=50 K. Best fitting models are marked with white squares. Bottom: comparison be￾tween observed abundances (blue dots) and predictions (red …

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