Pith Number

pith:DIR7GTUB

pith:2026:DIR7GTUBHZLGFRY664IG4DEO77

not attested not anchored not stored refs resolved

Charting circumstellar chemistry of carbon-rich asymptotic giant branch stars. III. SiO and SiS abundances

E. De Beck, H. Olofsson, L.-{\AA}. Nyman, M. Andriantsaralaza, M. G. Rawlings, M. Maercker, M. Van de Sande, R. Unnikrishnan, S. B. Charnley, T. Danilovich, T. J. Millar, W. H. T. Vlemmings

SiO peak abundances in most carbon-rich AGB stars are about five times higher than in the archetype IRC+10216, while SiS abundances stay similar across the sample.

arxiv:2605.15321 v1 · 2026-05-14 · astro-ph.SR · astro-ph.GA

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\pithnumber{DIR7GTUBHZLGFRY664IG4DEO77}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

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 obtain good fits to the SiO and SiS line profiles, and derived well-constrained abundance profiles and reliable isotopic ratios for all sources except AFGL 3068. While the SiS peak abundances are very similar across the sample (2.0×10^{-6}-4.7×10^{-6}), we find that the SiO peak abundances of the rest of the stars are a factor of ∼5 larger than that of IRC+10216. [...] We find that the currently assumed SiS photodissociation rate in chemical models is underestimated.

C2weakest assumption

The 1D non-LTE radiative transfer modeling with simplified (circum)stellar models accurately recovers the true radial abundance profiles and e-folding radii, despite the paper noting limitations inherent in such modeling when applied to real envelopes.

C3one line summary

Derived SiO and SiS abundances for five carbon stars via 1D non-LTE RT modeling of ALMA data show SiO levels ~5x higher than IRC+10216, similar SiS, good model match for SiO but overpredicted SiS radii, implying underestimated SiS photodissociation rate.

References

52 extracted · 52 resolved · 0 Pith anchors

[1] Agúndez, M. & Cernicharo, J. 2006, ApJ, 650, 374 Agúndez, M., Cernicharo, J., Quintana-Lacaci, G., et al. 2017, A&A, 601, A4 Agúndez, M., Fonfría, J. P., Cernicharo, J., et al. 2012, A&A, 543, A48 Agú 2006

[2] K., Rastogi, S., & Kumar, B 2023

[3] Andriantsaralaza, M., Ramstedt, S., Vlemmings, W. H. T., et al. 2021, A&A, 653, A53 2021

[4] Andriantsaralaza, M., Ramstedt, S., Vlemmings, W. H. T., & De Beck, E. 2022, A&A, 667, A74 2022

[5] J., & Scott, P 2009

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:00:52.579813Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

1a23f34e813e5662c71ef7106e0c8efff856ee3b07df1500b5bca3e52f81db08

Aliases

arxiv: 2605.15321 · arxiv_version: 2605.15321v1 · doi: 10.48550/arxiv.2605.15321 · pith_short_12: DIR7GTUBHZLG · pith_short_16: DIR7GTUBHZLGFRY6 · pith_short_8: DIR7GTUB

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/DIR7GTUBHZLGFRY664IG4DEO77 \
  | 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: 1a23f34e813e5662c71ef7106e0c8efff856ee3b07df1500b5bca3e52f81db08

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f2f280d993eb2717314dd7b515df336274077e5026d97dc3b0ebf801e838bb95",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-14T18:34:02Z",
    "title_canon_sha256": "0c64c3a7322db345baf3cd44797108716d817933b64abe2d075f76cc9d68b005"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.15321",
    "kind": "arxiv",
    "version": 1
  }
}