Pith Number

pith:W56TWLHX

pith:2026:W56TWLHXL65FLCMPUX7R3QTTSV

not attested not anchored not stored refs resolved

Production of heavy $\alpha$-elements and $^{44}$Ti in Cas A: comparison to abundances from 1D core-collapse supernova models and evidence for Carbon-Oxygen shell mergers

Chris L Fryer, Lorenzo Roberti, Luca Boccioli, Marco Pignatari, Samar Safi-Harb, Samuel Jones

Carbon-oxygen shell mergers produce the high argon-to-neon ratios and part of the titanium-44 observed in Cassiopeia A.

arxiv:2603.24758 v1 · 2026-03-25 · astro-ph.HE · astro-ph.GA · astro-ph.SR

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Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W56TWLHXL65FLCMPUX7R3QTTSV}

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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

C--O shell mergers are consistently the models that best match X-ray and infrared observations of Cas A, producing high Ar/Ne ratios (≳0.1) due to 20Ne depletion and production of 36Ar and 38Ar, with up to 20-30% of 44Ti located outside the reverse shock.

C2weakest assumption

That the 1D core-collapse supernova models used accurately capture the nucleosynthesis changes caused by C-O shell mergers without significant contributions from multidimensional effects or post-explosion mixing.

C3one line summary

Core-collapse supernova models including C-O shell mergers best match observed elemental ratios in Cas A, indicating mergers occur and contribute up to 20-30% of 44Ti outside the reverse shock.

References

63 extracted · 63 resolved · 2 Pith anchors

[1] 2020, Monthly Notices of the Royal Astronomical Society, 491, 972, doi: 10.1093/mnras/stz2952 2020 · doi:10.1093/mnras/stz2952

[2] 2019, The Astrophysical Journal, 890, 35, doi: 10.3847/1538-4357/ab64f8 2019 · doi:10.3847/1538-4357/ab64f8

[3] G., Dwek, E., Kober, G., Rho, J., & Hwang, U 2014 · doi:10.1088/0004-637x/786/1/55

[4] Arnett, W. D. 1969, The Astrophysical Journal, 157, 1369, doi: 10.1086/150157 1969 · doi:10.1086/150157

[5] 2025, Nature Astronomy, 10, 144, doi: 10.1038/s41550-025-02714-4 2025 · doi:10.1038/s41550-025-02714-4

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T00:00:37.035240Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b77d3b2cf75fba55898fa5ff1dc2739561e4e2f5ec58737c864684c917e8be81

Aliases

arxiv: 2603.24758 · arxiv_version: 2603.24758v1 · doi: 10.48550/arxiv.2603.24758 · pith_short_12: W56TWLHXL65F · pith_short_16: W56TWLHXL65FLCMP · pith_short_8: W56TWLHX

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/W56TWLHXL65FLCMPUX7R3QTTSV \
  | 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: b77d3b2cf75fba55898fa5ff1dc2739561e4e2f5ec58737c864684c917e8be81

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "47b20a13de7d4be576ecd6924552bbca394f11d2ec86b35a5b9c7c55afff9ae7",
    "cross_cats_sorted": [
      "astro-ph.GA",
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-03-25T19:29:58Z",
    "title_canon_sha256": "6d474107647f7ed8ed5e6b603a9062f10e0f8ccc683a9ee27824dcdff0a327ae"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2603.24758",
    "kind": "arxiv",
    "version": 1
  }
}