Pith Number

pith:IOMPA635

pith:2026:IOMPA635UCSAWPOLLNLJWIIDJT

not attested not anchored not stored refs resolved

Chemistry and ro-vibrational excitation of CH$^+$ in the planetary nebula NGC 7027

Alexandre Faure, Fran\c{c}ois Lique, Helmut Wiesemeyer, J\'er\^ome Loreau, Josh Forer, Milan Sil, Pierre Hily-Blant, Tom\'as Gonz\'alez-Lezana

Chemical pumping significantly enhances ro-vibrational emissions from CH+ in NGC 7027 beyond standard excitation processes.

arxiv:2604.08273 v2 · 2026-04-09 · astro-ph.GA

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\pithnumber{IOMPA635UCSAWPOLLNLJWIIDJT}

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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

RADEX models show that chemical pumping significantly enhances populations above (υ = 0, J = 1), strongly increasing ro-vibrational emission, especially in the υ=2 → 1 band.

C2weakest assumption

The chemical structure, temperature, and density profiles from the CLOUDY model accurately represent the nebula, and the new state-resolved collision data plus implemented chemical rates in RADEX capture the dominant excitation without requiring full 1D spatial modeling.

C3one line summary

Chemical pumping from formation and destruction processes significantly enhances CH+ ro-vibrational populations and emission lines in NGC 7027 beyond radiative and inelastic collisions alone.

References

10 extracted · 10 resolved · 0 Pith anchors

[1] A., & Alsolami, Z 2015

[2] Finally, for the pho- todissociation of CH + (reaction R6), theA V-dependent rate co- efficient was taken from Heays et al. (2017). For the reactions R1, R3, and R4, the rate coefficients were fitted 2017

[3] (2017), based on the more accurate but expensive time- dependent wave-packet (TDWP) method, and a good agreement (within a factor of 2017

[4] 1 of González-Lezana et al 2026

[5] The formation tempera- tureT form was taken as 2/3×(E H2(v,J)−∆H o 0), as observed and recommended by Faure et al 2017

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-27T14:06:43.444081Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4398f07b7da0a40b3dcb5b569b21034ccc846231e6b260ba09b53e134f5c6c47

Aliases

arxiv: 2604.08273 · arxiv_version: 2604.08273v2 · doi: 10.48550/arxiv.2604.08273 · pith_short_12: IOMPA635UCSA · pith_short_16: IOMPA635UCSAWPOL · pith_short_8: IOMPA635

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IOMPA635UCSAWPOLLNLJWIIDJT \
  | 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: 4398f07b7da0a40b3dcb5b569b21034ccc846231e6b260ba09b53e134f5c6c47

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "92749e15ab226e240a36909fa97d7c95c60a08dfc8a0e2f229a8016c9ea1a5be",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-09T14:02:57Z",
    "title_canon_sha256": "fc5a7c8dcb9b23d012ed316ce1a5e4275fde6559cc48a2253883121ad93db557"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.08273",
    "kind": "arxiv",
    "version": 2
  }
}