pith:TE7XYCQI
The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
The highest-mass neutron star with a reliable radius measurement has an equatorial circumference of 13.7 km.
arxiv:2105.06979 v1 · 2021-05-14 · astro-ph.HE · gr-qc · nucl-ex · nucl-th
Add to your LaTeX paper
\usepackage{pith}
\pithnumber{TE7XYCQIS3IDSR6QQBZBH7I3ES}
Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge
Record completeness
Claims
We find that the equatorial circumferential radius of PSR J0740+6620 is 13.7^{+2.6}_{-1.5} km (68%). When all measurements are included the radius of a 1.4 M_⊙ neutron star is known to ±4% and the radius of a 2.08 M_⊙ neutron star is known to ±5%.
The radius inference assumes specific geometries and temperature distributions for the rotating hot spots plus a particular model for the neutron-star atmosphere and beaming; if these are incorrect the reported credible intervals would shift.
PSR J0740+6620 has an equatorial radius of 13.7^{+2.6}_{-1.5} km, and multi-messenger data constrain 1.4 and 2.08 solar-mass neutron star radii to 12.45 and 12.35 km respectively.
References
Formal links
Cited by
Receipt and verification
| First computed | 2026-05-17T23:38:14.765517Z |
|---|---|
| Builder | pith-number-builder-2026-05-17-v1 |
| Signature | Pith Ed25519
(pith-v1-2026-05) · public key |
| Schema | pith-number/v1.0 |
Canonical hash
993f7c0a0896d03947d0807213fd1b24a0bf85ca011bded417e8875c354b5585
Aliases
· · · · ·Agent API
Verify this Pith Number yourself
curl -sH 'Accept: application/ld+json' https://pith.science/pith/TE7XYCQIS3IDSR6QQBZBH7I3ES \
| 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: 993f7c0a0896d03947d0807213fd1b24a0bf85ca011bded417e8875c354b5585
Canonical record JSON
{
"metadata": {
"abstract_canon_sha256": "e14a9d49e7e5a4b5dd280f59b2497da20462ff7216931ffad06c33dd9f3f1da6",
"cross_cats_sorted": [
"gr-qc",
"nucl-ex",
"nucl-th"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"primary_cat": "astro-ph.HE",
"submitted_at": "2021-05-14T17:33:32Z",
"title_canon_sha256": "b0015ddd7e9a2e5914c7cc63ada940693b6fe3f00776e4eb2f1eca7cbdb426ad"
},
"schema_version": "1.0",
"source": {
"id": "2105.06979",
"kind": "arxiv",
"version": 1
}
}