Pith Number

pith:C3V36TPY

pith:2026:C3V36TPYRIRSFHC6CDW47BMJ3Z

not attested not anchored not stored refs pending

Deep Adaptive Optics Imaging Rules Out a Helium Star Companion to PSR J1928+1815

Jim Fuller, Kareem El-Badry, Pranav Nagarajan, Thomas M. Tauris, Yunlang Guo

Deep adaptive optics imaging rules out a helium star companion to PSR J1928+1815.

arxiv:2604.03385 v2 · 2026-04-03 · astro-ph.SR · astro-ph.HE

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{C3V36TPYRIRSFHC6CDW47BMJ3Z}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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

No source is detected at the pulsar position down to a 5σ limit of Ks ≈ 21.3. Using stripped-star atmosphere models and conservative extinction estimates, we show that any plausible helium star companion would have been detected, ruling out this interpretation.

C2weakest assumption

The stripped-star atmosphere models accurately predict the near-infrared brightness for companions in the 1.0–1.6 M⊙ range, and the adopted extinction values are sufficiently conservative; if either is inaccurate, the non-detection would not fully exclude a helium star.

C3one line summary

Deep Keck/NIRC2 adaptive optics imaging rules out a helium star companion to PSR J1928+1815, supporting a massive white dwarf with possible wind-driven eclipses.

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-06-05T00:13:46.228013Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

16ebbf4df88a23229c5e10edcf8589de5aba4713d09db4cf8314ecdb609fc622

Aliases

arxiv: 2604.03385 · arxiv_version: 2604.03385v2 · doi: 10.48550/arxiv.2604.03385 · pith_short_12: C3V36TPYRIRS · pith_short_16: C3V36TPYRIRSFHC6 · pith_short_8: C3V36TPY

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/C3V36TPYRIRSFHC6CDW47BMJ3Z \
  | 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: 16ebbf4df88a23229c5e10edcf8589de5aba4713d09db4cf8314ecdb609fc622

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "195c80526c2c1c35e7d8b855f125e6349ca714d8294974e74ff085aa6b8e38f7",
    "cross_cats_sorted": [
      "astro-ph.HE"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-04-03T18:28:26Z",
    "title_canon_sha256": "cff7eb6bf5e1c328646278b0c32f7d422e92eaab910819e079eedd31e6948c36"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.03385",
    "kind": "arxiv",
    "version": 2
  }
}