Pith Number

pith:YBB3HZI3

pith:2026:YBB3HZI3GO4BDEA52DVNCUI4AS

not attested not anchored not stored refs resolved

Near-critical magnetic fields in Kepler red giants

F. Ligni\`eres, G. Li, J. Ballot, M. Villate, S. Deheuvels

Near-critical magnetic fields of 100 to 700 kG confined below the hydrogen-burning shell explain irregular g-mode periods in eight Kepler red giants.

arxiv:2604.09901 v1 · 2026-04-10 · astro-ph.SR

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\pithnumber{YBB3HZI3GO4BDEA52DVNCUI4AS}

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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Claims

C1strongest claim

We show that very good fits to all the observations can be obtained by identifying the two components as m=0 and m=1. These solutions correspond to fields with intensities ranging from 100 to 700 kG that are confined well below the H-burning shell. Our best-fit models for the eight stars have low masses (1.1-1.2 M⊙) and the maximal size of their convective core during the main sequence approximately corresponds to the radial extent of the measured magnetic fields. The detected fields could thus have been generated by dynamo action in the main-sequence convective core.

C2weakest assumption

The observed deviations from regular g-mode periods and the partial suppressions are produced by magnetic fields rather than other mechanisms, and the adapted non-perturbative formalism remains accurate for near-critical field strengths; the choice to identify the doublet components as m=0 and m=1 rather than m=±1 is also required for the fits.

C3one line summary

Near-critical magnetic fields of 100-700 kG confined below the H-burning shell are inferred in eight Kepler red giants via non-perturbative modeling of mixed-mode frequencies, identifying components as m=0 and m=1 rather than m=±1.

References

4 extracted · 4 resolved · 0 Pith anchors

[1] " * write output.state after.block = add.period write newline

[2] write newline

[3] , " * write output.state after.block = add.period write newline

[4] write newline

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-20T14:03:26.792887Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c043b3e51b33b811901dd0ead1511c049dc63fb5a62c019b1cac6940791b3a4f

Aliases

arxiv: 2604.09901 · arxiv_version: 2604.09901v1 · doi: 10.48550/arxiv.2604.09901 · pith_short_12: YBB3HZI3GO4B · pith_short_16: YBB3HZI3GO4BDEA5 · pith_short_8: YBB3HZI3

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/YBB3HZI3GO4BDEA52DVNCUI4AS \
  | 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: c043b3e51b33b811901dd0ead1511c049dc63fb5a62c019b1cac6940791b3a4f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "db501b8204080f1975b8382c285d24b5897c517cf7e9ca1ca3a057219846d54d",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-04-10T20:55:01Z",
    "title_canon_sha256": "74666d420c8a00f95d038cc9a63e2124c38d9768bd5a657c80af08ad340a55cf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.09901",
    "kind": "arxiv",
    "version": 1
  }
}