Pith Number

pith:FWUKLPX5

pith:2026:FWUKLPX5N2GMSJZ4HPF5ZN7ELF

not attested not anchored not stored refs resolved

Evidence for a bloated massive protostar in IRAS20126+4104

Riccardo Cesaroni

The 12 solar-mass protostar in IRAS20126+4104 is bloated to a radius of about 200 solar radii.

arxiv:2604.12552 v1 · 2026-04-14 · astro-ph.SR · astro-ph.GA

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\usepackage{pith}
\pithnumber{FWUKLPX5N2GMSJZ4HPF5ZN7ELF}

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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

The long rotation period implies that the 12 M_⊙ protostar is bloated, with a radius of ∼200 R_⊙.

C2weakest assumption

That the observed 6.8 yr periodicity is produced by stellar rotation with a surface spot rather than any of the other three clocks considered, and that the 12 M_⊙ mass and spot geometry allow a direct conversion from period to radius.

C3one line summary

Mid-IR light curves of IRAS20126+4104 confirm a 6.8 yr periodic variation interpreted as evidence that the 12 solar-mass protostar is bloated to a radius of roughly 200 solar radii due to rotation with an obscuring spot.

References

37 extracted · 37 resolved · 0 Pith anchors

[1] A., Levato, H., & Grosso, M 2002

[2] 1997, A&A, 325, 725 1997

[3] 2005, A&A, 434, 1039 Cesaroni R., Galli D., Neri R., & Walmsley C 2005

[4] 2023, A&A, 671, A126 2023

[5] M., & Sánchez-Monge, Á 2025

Receipt and verification

First computed	2026-05-20T14:03:26.822348Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

2da8a5befd6e8cc9273c3bcbdcb7e459727ba6d125cece4a07f4393b37d2da5d

Aliases

arxiv: 2604.12552 · arxiv_version: 2604.12552v1 · doi: 10.48550/arxiv.2604.12552 · pith_short_12: FWUKLPX5N2GM · pith_short_16: FWUKLPX5N2GMSJZ4 · pith_short_8: FWUKLPX5

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/FWUKLPX5N2GMSJZ4HPF5ZN7ELF \
  | 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: 2da8a5befd6e8cc9273c3bcbdcb7e459727ba6d125cece4a07f4393b37d2da5d

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dbc6418733464939ad686ffee7de437d381bdaef12696fa1187be9042cb73728",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-04-14T10:29:14Z",
    "title_canon_sha256": "41ad6b0347a549d88eb659de78beea9060765afb9cfbba821526598df8a0f656"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.12552",
    "kind": "arxiv",
    "version": 1
  }
}