Constraining Solid HNCO and Its Environment in Open JWST Data with Laboratory Spectra

The presence of HNCO in the gaseous phase is well known for the interstellar medium, but the molecule is not detected yet in the solid phase.

By Nakibov, Karteyeva, Borshcheva +3Oct 20, 2026

Score████░░░░░░4.4

Key numbers

0.15 % relative to solid H
10 K
23 K temperature range show

VerdictWorth a reader's time today.

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Abstract

The presence of HNCO in the gaseous phase is well known for the interstellar medium, but the molecule is not detected yet in the solid phase. We report the first laboratory-confirmed identification of solid HNCO at 2260 cm⁻¹ in open JWST data using laboratory infrared spectra. For that, we grew binary mixtures of HNCO with main constituents of interstellar ice using ISEAge setup at 10 K: HNCO:H₂O = 1:10, HNCO:CO = 1:10, HNCO:CO₂ = 1:10, HNCO:CH₃OH~=~1:10. We present transmission infrared spectra of pure HNCO and HNCO-bearing ices along with the corresponding band strengths at 10 K. The fitting of open JWST observational data with the laboratory reference spectra in a 10--23 K temperature range show that solid HNCO is predominantly located in the apolar layer rich in CO. The abundance of solid HNCO is approximately estimated as 0.04--0.15% relative to solid H₂O. The positive correlation between HNCO and N₂O suggests their co-formation via the chemical route that includes solid N₂. The results are also supported by the numerical modeling of HNCO formation in protostellar objects with predicted abundance of 0.06--0.11%. We calculated the upper limits for CH₃CN toward two protostars and evaluated its abundance to solid water using the spectroscopic fitting and modeling.

Ruslan Nakibov, Varvara Karteyeva, Katerina Borshcheva, Igor Petrashkevich, Mikhail Medvedev, Anton Vasyunin

The editor's rubric

Heuristic review

Leverage3 / 5: A method or resource many groups across the field will adopt within a year.; 18% of this desk’s rubric
Magnitude3 / 5: Large gain: roughly 2x, or a clear new state of the art on a hard, unsaturated problem.; 20% of this desk’s rubric
Evidence3 / 5: Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.; 22% of this desk’s rubric
Novelty3 / 5: A genuinely new approach to an open problem.; 22% of this desk’s rubric
Trajectory2 / 5: Some room to improve with obvious engineering.; 10% of this desk’s rubric
Stakes2 / 5: Benefits a professional community (practitioners, clinicians, engineers).; 8% of this desk’s rubric

Dimension	Level	Weight	What that level means
Leverage	███░░ 3	18%	A method or resource many groups across the field will adopt within a year.
Magnitude	███░░ 3	20%	Large gain: roughly 2x, or a clear new state of the art on a hard, unsaturated problem.
Evidence	███░░ 3	22%	Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.
Novelty	███░░ 3	22%	A genuinely new approach to an open problem.
Trajectory	██░░░ 2	10%	Some room to improve with obvious engineering.
Stakes	██░░░ 2	8%	Benefits a professional community (practitioners, clinicians, engineers).

Editor’s rationale

Heuristic triage from title and abstract text only, not a reading of the paper. Cues found: method (we propose, we report); firsts (first); verification (independent replication).

How the score was computed

rank-2026-10-18

Score████░░░░░░4.4

Score = 10 × (75% × adjusted merit / 10 + 15% × attention + 10% × freshness)

Desks place stronger verdicts first, then use this score to order work within the same verdict.

Merit: 5.6 / 10; Weighted rubric, evidence-gated.
Adjusted merit: 4.6 / 10; Shrunk toward the desk prior by editor confidence (38%).
Attention: 0%; Citations, upvotes, points, mentions.
Freshness: 91%; Half-life decay since publication.

No attention signals recorded yet.

The record

Reviewed by heuristic-v7 on Oct 21, 2026, 07:29 UTC. Paper type: method.
Categories: astro-ph.GA, astro-ph.SR
TOP, No.3 in the Physics edition of October 21, 2026.