Pith Number

pith:SFQ6YZ7O

pith:2026:SFQ6YZ7OAN2D35LPLXZGOZEFJW

not attested not anchored not stored refs resolved

Sub-Neptunes as Soot Factories: Deep Atmosphere Hydrocarbon Formation and Quenching as the Origin of Sub-Neptune Aerosol Trends

Arjun B. Savel, Eliza M.-R. Kempton, Jeehyun Yang

Sub-Neptune atmospheres produce peak amounts of soot-forming hydrocarbons around 600 K through deep-atmosphere quenching.

arxiv:2604.11919 v2 · 2026-04-13 · astro-ph.EP

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\usepackage{pith}
\pithnumber{SFQ6YZ7OAN2D35LPLXZGOZEFJW}

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1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We find that the predicted abundances of PAHs peak near 600 K, and fall off toward higher and lower Teq, consistent with the observed muted-spectra regime suggested in observational studies by HST and JWST.

C2weakest assumption

That the automated rate-based network generator produces a sufficiently complete reaction set and that deep-atmosphere quenching dominates the observable-layer abundances without photochemistry or other processes substantially altering the PAH levels across the full Teq range.

C3one line summary

Deep hydrocarbon chemistry and quenching in sub-Neptunes create PAH abundances peaking at 600 K, providing a first-principles explanation for the muted transmission spectra trend between 500-800 K.

References

16 extracted · 16 resolved · 0 Pith anchors

[1] 2025a, ApJL, 985, L10, doi: 10.3847/2041-8213/add010 2025 · doi:10.3847/2041-8213/add010

[2] (2023); Roy et al 2023

[3] (2024) GJ 1214 b (HST; Kreidberg et al 2024

[4] (2024); Ohno et al 2024

[5] (2022); Ahrer et al 2022

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:00:37.871726Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9161ec67ee03743df56f5df26764854d82dfa93da3675e609a967cf5883c5bfa

Aliases

arxiv: 2604.11919 · arxiv_version: 2604.11919v2 · doi: 10.48550/arxiv.2604.11919 · pith_short_12: SFQ6YZ7OAN2D · pith_short_16: SFQ6YZ7OAN2D35LP · pith_short_8: SFQ6YZ7O

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/SFQ6YZ7OAN2D35LPLXZGOZEFJW \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 9161ec67ee03743df56f5df26764854d82dfa93da3675e609a967cf5883c5bfa

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f6c84e8b7a7542294d615b629a2fd24d7ffe20d2b46b9c87578951fd851da500",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.EP",
    "submitted_at": "2026-04-13T18:07:10Z",
    "title_canon_sha256": "155fb688548c0d8d974725614aa47ece63bf496c8eb2d74986861118ea95bed6"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.11919",
    "kind": "arxiv",
    "version": 2
  }
}