REVIEW 3 major objections 6 minor 7 cited by
Virga v1, an open-source cloud model for substellar atmospheres, reproduces benchmark cloud detections in exoplanets and brown dwarfs when given self-consistent inputs.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
The Virga-v1 code reproduces the WASP-17 b SiO2 cloud detection and the Diamondback brown dwarf cloud models, with new fall-speed and optical-constant updates.
T0 review reviewed 2026-08-05 challenge →
load-bearing objection A genuinely useful open-source cloud code release with an honest but over-claimed benchmark; the brown dwarf reproduction requires private EGP logs, so the abstract promises more than public inputs deliver. the 3 major comments →
Condensation Clouds in Substellar Atmospheres with Virga
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
Core claim
On its own terms, the paper claims that Virga-v1, with updated optical constants, Mie machinery, saturation vapor pressure curves, and fall-speed treatment, reproduces key literature results: the WASP-17 b SiO2 cloud detection and the Diamondback-Sonora brown dwarf model grid. The WASP-17 b reproduction requires deliberately choosing only the condensates supported by the detection, rather than every species that thermodynamically condenses, because adding Mg-clouds creates a second deck that flattens the observed water feature. The Diamondback reproduction is near-exact only when the original climate model's convective heat flux, and hence its Kzz profile, is supplied; approximating Kzz from
What carries the argument
The load-bearing object is the one-dimensional eddy-sedimentation balance, -Kzz dqt/dz - f_sed w* qc = 0, with w* = Kzz/L. It states that upward turbulent mixing of condensate and vapor is balanced by downward sedimentation, controlled by the sedimentation efficiency f_sed. Virga solves this equation layer by layer, computes a fall-speed particle radius by balancing the particle's terminal velocity against the convective velocity scale, maps that radius onto a lognormal size distribution, subdivides the pressure grid until the layer optical depth converges, and outputs extinction, single-scattering albedo, and asymmetry for radiative transfer. The fall-speed calculation uses Reynolds-number
Load-bearing premise
The benchmark results are only as reproducible as the unpublished climate-model log files that supply the convective heat flux; without them, Kzz is wrong by up to two orders of magnitude and cloud bases shift.
What would settle it
Run Virga v1 using only the publicly archived Diamondback Zenodo pressure-temperature profiles and a temperature-only estimate for convective heat flux, then compare the resulting T=900 K cloud optical depth profile with the published Diamondback profile. If the cloud base does not fall within the published high-opacity region, or if the WASP-17 b SiO2 spectral fit loses the observed water feature, the central reproducibility claim fails.
If this is right
- Users can reproduce the WASP-17 b SiO2 cloud and Diamondback cloud optical properties with Virga v1 when the input P-T, f_sed, and Kzz profiles match the original studies.
- The choice of condensate set is physically consequential: including all condensing species can introduce a spurious Mg-silicate cloud deck that flattens the 10-12 micron water feature in transit spectra.
- A crude estimate of Kzz from temperature alone is not adequate; self-consistent convective heat flux from a climate model is needed to reproduce cloud profiles to the claimed fidelity.
- The new slip-corrected fall speed removes the unphysical drop in terminal velocity between the Stokes and intermediate Reynolds regimes, and the Khan-Richardson alternative may become the default in future versions.
- Virga's ongoing development, including a planned aggregate-particle version, builds directly on this v1 foundation.
Where Pith is reading between the lines
- The reproducibility claim is conditional on access to unpublished climate-model log files; publishing those convective heat flux and Kzz profiles would make the benchmark independently reproducible.
- If Kzz uncertainty of two orders of magnitude is generic, spectral retrievals that parameterize Kzz as a free variable should treat cloud optical depth predictions as highly sensitive to that parameter.
- The Cunningham slip correction applied to the intermediate Reynolds regime could also improve other sedimentation and cloud-microphysics codes that use Davies-type drag fits.
- A direct testable consequence is that Virga v1 run on only public Diamondback inputs should show the stated ~0.5 dex cloud-base shift for T=900 K but still match high-opacity regions; users relying on public archives should expect this offset.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper presents Virga-v1, the first officially released version of the open-source Python implementation of the Ackerman & Marley (2001) eddysed cloud model. It documents the code workflow, the updated optical-constants and Mie-property databases, the condensation chemistry and saturation vapor pressure curves, the treatment of Kzz and mixing length, and a revised fall-speed calculation that adds a Cunningham slip correction in the intermediate Reynolds-number regime and offers an optional Khan-Richardson drag law. The paper benchmarks Virga-v1 against two literature results: the SiO2 cloud detection in WASP-17 b (Grant et al. 2023) and the Diamondback-Sonora brown dwarf model grid (Morley et al. 2024). The authors are transparent in Section 5 that the near-exact Diamondback match is obtained only when unpublished EGP log-file profiles (P-T, net fluxes, and Kzz) are supplied, and that the public Diamondback Zenodo P-T profiles produce a ~0.5 dex cloud-base offset at Teff = 900 K (Figure 11).
Significance. If the benchmarks hold, Virga-v1 is a valuable community resource: it is open source, has Zenodo releases of both code and optical/Mie data, includes tutorials and an IOR factory for reproducible optical-constant processing, and its WASP-17b comparison against an observed spectrum provides an externally anchored check. The fall-speed discontinuity analysis and the proposed Cunningham-correction fix are genuine improvements over the original AM01 formulation. However, the flagship brown-dwarf benchmark is currently a private-data consistency check rather than a public reproduction: the abstract's unqualified claim of reproducing the Diamondback-Sonora model series is not something an independent user can verify from the released code and public inputs. This does not invalidate the code or the paper's contribution, but it does require a qualification or an archival fix before publication.
major comments (3)
- [§5 (Figures 10, 11) and Abstract] The central claim that Virga-v1 'reproduc[es] ... the brown dwarf Diamondback-Sonora model series' is supported only when unpublished EGP log-file profiles are used. The paper itself shows in Figure 11 that the public Diamondback Zenodo P-T profile leads to a ~0.5 dex shift of the T=900 K cloud base, and Figure 10A shows that a temperature-based estimate of the convective heat flux gives Kzz values that differ by up to two orders of magnitude from the EGP values. An independent user cannot verify the headline result with public data alone. Please archive the EGP log files (or machine-readable equivalents) with the Zenodo release, and either remove or explicitly qualify the abstract's reproduction claim to state that the close match requires the self-consistent EGP inputs, with the public-input result presented as the reproducible benchmark.
- [§3.5.4 and §3.5.7] The claimed removal of the Regime 1–2 discontinuity is not fully specified. The text says the Regime 2 drag coefficient is divided by the Cunningham correction β (Eq. 27), but the Davies/Best-number method (Eq. 28) and the polynomial fit in log(Re) vs. log(Cd Re^2) were calibrated for continuum drag. The manuscript does not state whether the inversion is performed on (Cd Re^2)/β or whether Re is then recomputed consistently, nor does it quantify the impact of this correction on particle radii or cloud optical depths in the benchmarks. Please provide the exact modified algorithm and a quantitative verification (e.g., terminal-velocity curves across the relevant pressure/temperature range compared with the Khan-Richardson model) so the smoothness claim is reproducible and not just visual.
- [§3.5.6 and §3.5.3] The Regime 3 calculation is internally inconsistent: Step 2 decides the regime from a Stokes-law Reynolds number, but Step 4 can produce a terminal velocity whose corresponding Reynolds number is below 1000, as the authors acknowledge in §3.5.6. This means the default fall speed is not self-consistent in part of parameter space. Since the fall-speed calculation is a core component of the code, please either fix the iteration by solving v_f and Re jointly with the selected Cd(Re), or document the affected particle-size/pressure range and mark the Regime 3 result as provisional in the default v1 release.
minor comments (6)
- [Abstract] The phrase 'Here we present an open-source cloud model' should clarify that this paper presents the official v1 release of an already existing v0 code base, to avoid the impression that the code is first introduced here.
- [§3.5.4] Text near Figure 5 says 'The resulting fall speeds and subsequent Reynolds numbers are plotted in Figure 3. The results are plotted in Figure 5.' This is confusing; the corrected curves are in Figure 5 and should be cited there.
- [Figure 11 caption] The phrase 'lower in pressure by ~0.5 dex bar' should be '~0.5 dex in pressure' (or '~0.5 bar') to avoid an ambiguous unit.
- [References] Gao et al. 2020a and 2020b appear to share the same DOI (10.1038/s41550-020-1114-3). Please verify and distinguish the two entries, or merge them if they are the same work.
- [§3.3] The example gas_mmr={'H2O':1e6} does not state the units of the number 1e6 (presumably ppm). Please state the expected unit in the text or in a code docstring reference.
- [§5] The EGP log files are described as 'available upon request (priv. comm. C. Morley).' For a reproducibility-focused paper, this should be replaced by an archived public dataset or a permanent Zenodo link, consistent with the paper's open-science emphasis.
Circularity Check
Diamondback 'reproduction' is a self-consistency check using unpublished EGP inputs from a co-author; the WASP-17b benchmark reuses retrieval parameters from the same Virga model family.
specific steps
-
fitted input called prediction
[Section 4 (Exoplanet Benchmarks), Fig. 8-9]
"We use the max loglikelihood pressure-temperature profile published in D. Grant et al. (2023) along with associated max loglikelihood model values for f sed and K zz."
The benchmark's inputs (P-T, f_sed, K_zz) are the maximum-likelihood values from the Grant et al. (2023) retrieval, which used the Virga-v0 code base. Virga's equations (Eqs. 1-15) deterministically map these inputs to cloud optical depths and spectra. Re-running Virga-v1 with the same fitted inputs therefore returns the same model by construction; it cannot independently confirm or falsify the SiO2 detection, only test whether v1 reproduces v0. The paper itself notes a factor-of-2 optical depth change from an updated Al2O3 mixing ratio, confirming that this benchmark is a code-regression check rather than a first-principles prediction.
-
self citation load bearing
[Section 5 (Brown Dwarf Benchmarks with Diamondback), Figs. 10-11]
"We first take the pressure-temperature profiles, net fluxes, and K zz profiles from the original climate model log files (EGP, in this case) generated for the Diamondback grid, which are available upon request (priv. comm. C. Morley). ... This near exact matching example shown in Figure 10 relies on unpublished pressure-temperature profiles."
The Diamondback models were generated by EGP, whose cloud module uses the same AM01/eddysed methodology Virga implements, and C. Morley is a co-author of this paper. Feeding the exact EGP-generated K_zz and P-T profiles back into Virga makes the matching of cloud optical depths a self-consistency check: the generative inputs determine the outputs by construction. The paper concedes that using the public Zenodo P-T profiles shifts the T=900 K cloud base by ~0.5 dex, so the abstract's claim to reproduce the Diamondback-Sonora model series is only achieved with unpublished, same-group data. This does not validate the cloud physics externally; it verifies code fidelity to its own heritage.
full rationale
The paper is primarily a code-description and benchmarking paper, and its fall-speed improvement is validated against external data (Khan & Richardson 1987), which is not circular. However, the two headline benchmarks are both self-referential. The WASP-17b SiO2 benchmark reuses the maximum-likelihood f_sed and K_zz values from a retrieval that already used Virga-v0; the reproduction is therefore a regression test of code changes, not an independent prediction of the cloud detection. The Diamondback benchmark goes further: the 'near exact matching' is achieved only by using unpublished EGP log files (pressure-temperature, net fluxes, K_zz) privately supplied by a co-author. Since Virga implements the same AM01/eddysed equation solved by EGP, running Virga with the original EGP inputs forces agreement. The paper honestly discloses this limitation and shows that public inputs yield a ~0.5 dex cloud-base shift at T=900 K, but the abstract's wording 'reproduc[es] key results in the literature' overstates what is actually demonstrated. No parameter is fitted in this paper to force agreement, and the code itself is open-source, so the circularity is partial rather than total. Score 5 reflects that the central reproducibility claims reduce, in part, to self-consistency checks with same-group inputs, while the code release and fall-speed fix retain independent content.
Axiom & Free-Parameter Ledger
free parameters (4)
- f_sed (sedimentation efficiency) =
user-defined; example values from Grant et al. 2023 in benchmark
- Kzz (eddy diffusion coefficient) =
user-supplied or computed via Gierasch-Conrath (Eq. 20)
- sigma_g (lognormal width) =
user-defined; default not specified numerically
- S (supersaturation parameter) =
default S=0
axioms (5)
- domain assumption One-dimensional vertical column with no horizontal transport
- domain assumption Vapor pressure saturation equilibrium for condensates
- ad hoc to paper Constant-with-altitude ratio qc/qt
- domain assumption Lognormal particle size distribution
- domain assumption Gas mixing ratios scale linearly with M/H below the cloud base
Cite this review
Pith. "Pith review of Condensation Clouds in Substellar Atmospheres with Virga." pith.science (2026). https://pith.science/paper/CTN2EK2I
@misc{pith2026250815102,
author = {Pith},
title = {Pith review of: Condensation Clouds in Substellar Atmospheres with Virga},
year = {2026},
howpublished = {\url{https://pith.science/paper/CTN2EK2I}},
note = {Machine review of arXiv:2508.15102}
}
read the original abstract
Here we present an open-source cloud model for substellar atmospheres, called Virga. The Virga-v0 series has already been widely adopted in the literature. It is written in Python and has heritage from the Ackerman & Marley (2001) model (often referred to as eddysed), used to study clouds on both exoplanets and brown dwarfs. In the development of the official Virga-v1 we have retained all the original functionality of eddysed and updated/expanded several components including the back-end optical constants data, calculations of the Mie properties, available condensate species, saturation vapor pressure curves and formalism for fall speeds calculations. Here we benchmark Virga by reproducing key results in the literature, including the SiO2 cloud detection in WASP-17 b and the brown dwarf Diamondback-Sonora model series. Development of Virga is ongoing, with future versions already planned and ready for release. We encourage community feedback and collaborations within the GitHub code repository.
Figures
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