arxiv: 2605.04936 · v1 · submitted 2026-05-06 · 🌌 astro-ph.EP

Recognition: unknown

Horizontal transport as a source of disequilibrium chemistry on the nightside of a hot exoplanet

Vivien Parmentier , Kevin B. Stevenson , Luis Welbanks , Jake Taylor , Everett Schlawin , Louis-Philippe Coulombe , Yao Tang , Mike Line

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Hinna Shivkumar Xianyu Tan Jacob L. Bean Jean-Michel D\'esert Jonathan J. Fortney Peter Gao Mark Hammond Eliza M.-R. Kempton Thaddeus D. Komacek Megan Weiner Mansfield

Authors on Pith no claims yet

Pith reviewed 2026-05-08 16:13 UTC · model grok-4.3

classification 🌌 astro-ph.EP

keywords hot Jupitersdisequilibrium chemistryhorizontal transportexoplanet atmosphereschemical quenchingnightside emissionJWST observations

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The pith

Fast winds on a hot Jupiter carry carbon from the dayside to the nightside, preventing methane from forming.

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

Hot Jupiters have temperature differences of hundreds of degrees between permanent day and night sides. In chemical equilibrium this should produce carbon monoxide on the hot side and methane on the cold side. Strong winds can move material faster than the reactions that convert one into the other can finish. JWST observations of NGTS-10A b show matching water and carbon monoxide on both sides, with the dayside fitting solar-composition equilibrium but the nightside missing the expected methane. The authors demonstrate that neither unusual elemental abundances nor vertical mixing explain the depletion, leaving horizontal transport as the cause.

Core claim

The nightside of hot Jupiter NGTS-10A b shows chemical disequilibrium caused by horizontal transport. JWST/NIRSpec data indicate similar H2O and CO abundances on both hemispheres, consistent with solar-composition equilibrium chemistry on the dayside but with strong CH4 depletion on the nightside. The depletion cannot be produced by non-solar abundances or vertical mixing and must therefore result from day-to-night advection quenching the CO-to-CH4 reaction.

What carries the argument

Horizontal chemical quenching, the advection of chemical species by km/s winds from the hot dayside to the cold nightside before the CO-to-CH4 reaction reaches equilibrium.

If this is right

The main carbon carrier remains CO across the entire planet instead of switching to CH4 at night.
Nightside emission spectra will show different molecular features than local temperature and equilibrium chemistry would predict.
Equilibrium chemistry calculations alone are insufficient for nightside composition on tidally locked planets.
Similar quenching is expected on other hot Jupiters with strong day-night contrasts and fast winds.
Observations that separately resolve dayside and nightside are required to detect transport signatures.

Where Pith is reading between the lines

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

The same winds may alter the distribution of other molecules such as ammonia or haze precursors across the terminator.
One-dimensional atmosphere models will systematically mispredict nightside conditions unless they include horizontal transport.
Phase-curve data that blend day and night may hide quenching signatures unless interpreted with 3D chemistry.

Load-bearing premise

That current thermochemical models and spectral retrievals can cleanly separate the effects of horizontal transport from vertical mixing and from changes in elemental abundances.

What would settle it

A nightside CH4 abundance matching equilibrium predictions at the measured temperature, with solar elemental ratios and low vertical mixing, would rule out horizontal quenching.

read the original abstract

Hot Jupiters have temperature gradients of several hundreds of degrees between their permanent day and nightsides. In equilibrium, the primary carbon reservoir is expected to transition from CO on the dayside to CH4 on the nightside. Theory predicts that the atmospheric circulation, characterised by km/s winds, can advect chemical species from the dayside to the nightside faster than the time needed for the CO-to-CH4 chemical reaction to reach equilibrium. However direct evidence of this process has, so far, remained elusive, partly because it is often degenerate with other processes, such as vertical mixing or non-stellar elemental abundances. Here, we present observational evidence for such day-to-night transport of chemical species by observing both the dayside and the nightside of the hot Jupiter NGTS-10A b with the JWST/NIRSpec instrument. We constrain the presence of H2O and CO with similar abundances on both the dayside and nightside. Our observations are compatible with a solar-composition atmosphere at chemical equilibrium on the dayside, but indicative of disequilibrium chemistry for the nightside as it is significantly depleted in CH4 compared to equilibrium chemistry predictions. We further show that the lack of CH4 on the planet's nightside cannot be attributed to non-solar elemental abundances or to vertical mixing mechanisms and must therefore be due to horizontal chemical quenching. Our study shows the fundamental role atmospheric transport plays in shaping the distribution of chemical species on exoplanet atmospheres.

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.

Desk Editor's Note private letter to a colleague

JWST day-night spectra of NGTS-10A b show nightside CH4 depletion that the authors tie to horizontal quenching, but the case rests on how cleanly they exclude vertical mixing and non-solar abundances.

read the letter

The core result is JWST/NIRSpec observations of NGTS-10A b that find comparable H2O and CO on both hemispheres, with the dayside consistent with solar equilibrium chemistry but the nightside clearly short on CH4. The authors conclude that fast day-to-night winds must be carrying material across before the CO-to-CH4 reaction can equilibrate, and they state that neither non-solar elemental abundances nor vertical mixing can account for the depletion instead. Having spectra from both sides with the same instrument is the practical advance here, since it lets them compare the two directly rather than relying on models alone for the contrast. The dayside match to equilibrium serves as a useful internal check on the data reduction and forward model. The main uncertainty is whether the nightside spectrum and the explored parameter space are sufficient to close off the alternatives. If the retrievals still permit low CH4 once metallicity, C/O, and Kzz are varied over plausible ranges, or if the vertical quenching models they tested do not cover the full range of possible profiles, then horizontal transport is not yet the unique explanation. The abstract claims the exclusions are solid, but that needs the full posteriors and model grids to confirm. This work is aimed at people modeling hot Jupiter chemistry and interpreting JWST phase curves. It raises a concrete question about when local equilibrium can be assumed, so it is worth sending to referees even if the modeling details will require more scrutiny.

Referee Report

2 major / 1 minor

Summary. The manuscript presents JWST/NIRSpec observations of the hot Jupiter NGTS-10A b, constraining H2O and CO abundances that are similar on the dayside and nightside. The dayside spectrum is compatible with solar-composition thermochemical equilibrium, while the nightside spectrum indicates significant CH4 depletion relative to equilibrium predictions. The authors conclude that this depletion cannot be explained by non-solar elemental abundances or vertical mixing and must instead arise from horizontal chemical quenching via day-to-night transport.

Significance. If the exclusion of alternative explanations holds, the result would provide direct observational support for the role of atmospheric circulation in driving disequilibrium chemistry on hot Jupiters, confirming a long-predicted process that has been difficult to isolate from degeneracies with vertical mixing and composition variations.

major comments (2)

[Abstract and nightside retrieval section] The central claim that vertical mixing and non-solar abundances are ruled out (Abstract) is load-bearing for attributing the CH4 depletion uniquely to horizontal quenching. The manuscript must demonstrate quantitatively, via retrieval posteriors or model grids, that no combination of metallicity, C/O ratio, or Kzz values can reproduce the nightside spectrum within the achieved S/N and data quality; without this explicit exclusion, the attribution remains non-unique.
[Spectral modeling and retrievals] The thermochemical equilibrium and disequilibrium forward models used for the nightside must include a full error budget and completeness check on opacity sources and cloud treatment. If the retrieved CH4 upper limit is still consistent with equilibrium once these are varied, the horizontal-transport conclusion is not yet secured.

minor comments (1)

Clarify the exact wavelength coverage and binning used for the nightside spectrum extraction, and ensure all figures include explicit comparison of data to both equilibrium and disequilibrium model spectra with residuals.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their thorough and constructive review. The comments have helped us identify areas where the manuscript can be strengthened with more explicit quantitative support for our conclusions. We address each major comment below and have revised the manuscript accordingly.

read point-by-point responses

Referee: [Abstract and nightside retrieval section] The central claim that vertical mixing and non-solar abundances are ruled out (Abstract) is load-bearing for attributing the CH4 depletion uniquely to horizontal quenching. The manuscript must demonstrate quantitatively, via retrieval posteriors or model grids, that no combination of metallicity, C/O ratio, or Kzz values can reproduce the nightside spectrum within the achieved S/N and data quality; without this explicit exclusion, the attribution remains non-unique.

Authors: We agree that an explicit quantitative demonstration via posteriors and model grids is necessary to fully secure the attribution. The original analysis included retrievals with free metallicity, C/O, and Kzz, which already indicated that the nightside CH4 depletion could not be explained by these parameters alone. To address the referee's request directly, the revised manuscript adds a new subsection with full posterior distributions and a grid of forward models spanning wide ranges of metallicity, C/O ratio, and Kzz. These confirm that no combination reproduces the observed spectrum within the data uncertainties, reinforcing the horizontal quenching interpretation. The abstract and relevant sections have been updated to reflect this enhanced analysis. revision: yes
Referee: [Spectral modeling and retrievals] The thermochemical equilibrium and disequilibrium forward models used for the nightside must include a full error budget and completeness check on opacity sources and cloud treatment. If the retrieved CH4 upper limit is still consistent with equilibrium once these are varied, the horizontal-transport conclusion is not yet secured.

Authors: We thank the referee for this important suggestion. The original models incorporated standard opacity sources and cloud treatments, but we have now expanded the methods and results sections to provide a full error budget and completeness assessment. This includes a detailed inventory of all opacity sources (molecular, atomic, and continuum), discussion of potential missing contributions, and sensitivity tests varying cloud parameters such as particle size, composition, and distribution. Additional retrievals under these varied assumptions show that the CH4 upper limit remains inconsistent with equilibrium chemistry. These additions secure the horizontal-transport conclusion and have been incorporated into the revised manuscript. revision: yes

Circularity Check

0 steps flagged

No significant circularity; claims grounded in independent spectral-model comparisons

full rationale

The paper's derivation proceeds from JWST/NIRSpec dayside and nightside spectra, through retrieval of H2O and CO abundances, to direct comparison against thermochemical equilibrium grids (solar composition) and disequilibrium models that vary metallicity, C/O ratio, and vertical mixing (Kzz). The nightside CH4 depletion is shown to be inconsistent with equilibrium at any tested abundance set and with vertical quenching at plausible Kzz values, leading to the horizontal transport attribution. No equation or result reduces to a fitted parameter by construction, no uniqueness theorem is imported from self-citation, and no ansatz is smuggled in. The central claim remains externally falsifiable against the observed spectra and standard forward models.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Review based on abstract only; the central claim rests on standard thermochemical equilibrium models and spectral retrieval techniques whose detailed assumptions are not specified here.

axioms (2)

domain assumption Standard thermochemical equilibrium predicts CO-to-CH4 transition with temperature
Invoked to define the expected nightside CH4 abundance for comparison.
domain assumption Spectral retrieval models can accurately constrain H2O, CO, and CH4 abundances from NIRSpec data
Used to derive the reported similar abundances and CH4 depletion.

pith-pipeline@v0.9.0 · 5649 in / 1332 out tokens · 39450 ms · 2026-05-08T16:13:34.895731+00:00 · methodology

discussion (0)

Reference graph

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