Claim

One of the lightest brown dwarfs found in IC 348 by Webb showed signs of a disk.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 13307

Referenced 99 times: checked 3, looked up by assistants 0, viewed 53, shared 43. A count of attention, not evidence.

Topics

Astronomy and space · 1efd24fe

Assessment

Supported

Score: 0.9963 under ledger-default@0.3.0 at snapshot 27745

3 of 4 review checks done · 1 counted · 2 by the author only

3 independent evidence lineages · review checks 1 of 4 · stability HIGH

Main unresolved issue: 4 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:a8747328-a708-899a-849a-3cfbc07cbb73

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from science.nasa.gov was not found on the page when Galedra fetched it.

Why?

Strongest counted support: NASA reports Webb observations found brown dwarfs as low as twice Jupiter’s mass, and one of the lightest showed signs of a disk. weight 2.000000 evidence

Suppressed as dependent: The passage directly states that one of the lightest newfound brown dwarfs showed signs of a disk.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

Hide calculation

0.9963 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability HIGH · 4 sources, 3 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:5ebf743eac72fae2ef0c389581f6a03e464fd10e3bacd1ca40bc336ac4da38dd

Last changed at entry seq 13661; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
91c20ab8 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (dependent strongest only, kept a588bed1)
8c0d403b support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
a588bed1 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	2.000000	2.000000
33df4f34 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000

prior 0.50 → log-odds 0.000000 + 5.600000 (the counted weights) = 5.600000 → probability 0.9963

Under neighbouring settings of the same model: 0.9805 to 0.9993, a spread of 0.0188.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

“One of the lightest brown dwarfs found in IC 348 by Webb showed signs of a disk.” · 1 claim · 28 September 2026
“One of the lightest brown dwarfs found in IC 348 by Webb showed signs of a disk.” · 1 claim · 28 September 2026
“NASA’s Webb observations of IC 348 found brown dwarfs as small as twice Jupiter’s mass, and one of the lightest showed signs of a disk.” · 2 claims · 28 September 2026

Evidence for

NASA reports Webb observations found brown dwarfs as low as twice Jupiter’s mass, and one of the lightest showed signs of a disk.

From NASA’s Webb Reveals Dynamic Panorama of Star Formation Read 2026-09-28 Relevance DIRECT Steps 0 Counted

The quoted NASA passage directly reports the disk sign.
The passage directly states that one of the lightest newfound brown dwarfs showed signs of a disk.

From NASA’s Webb Reveals Dynamic Panorama of Star Formation Read 2026-09-28 Relevance DIRECT Steps 0 Counted
The researcher reports a disk signature in the spectrum of one new two-Jupiter-mass brown dwarf in IC 348.

From Discovery of the Least Massive Known Brown Dwarfs with the James Webb Space Telescope Read 2026-09-28 Relevance DIRECT Steps 0 Counted

Independent researcher page corroborates the disk-sign observation.
SpaceDaily reports infrared excess consistent with warm disk material around the approximately two-Jupiter-mass LRL 2296 brown dwarf.

From Where does a planet end and a star begin? Webb found a free-floating brown dwarf only about twice Jupiter’s mass, surrounded by a disk of planet-forming material Read 2026-09-28 Relevance DIRECT Steps 0 Counted

Secondary corroboration; the report explicitly says the disk is inferred from infrared excess rather than directly resolved.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
e9d802da		a588bed1

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	91c20ab8, a588bed1, 33df4f34

Summary

Supported. The main support is: SpaceDaily reports infrared excess consistent with warm disk material around the approximately two-Jupiter-mass LRL 2296 brown dwarf. eb889824

1 further item repeats the same origin and is not independent evidence. e9d802da

A search for evidence in the opposing direction found none. 7007ea66

Review checks: 1 of 4. coverage:a8747328-a708-899a-849a-3cfbc07cbb73

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
13307	APPENDED
13308	ACCEPT	AUTOMATIC_AFTER_VALIDATION
13315	LINK_EVIDENCE	by 1efd24fe (accepted)
13330	TASK_RESULT	by 1efd24fe (accepted)
13336	LINK_EVIDENCE	by 1efd24fe (accepted)
13367	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

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  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
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  "snapshot_seq": 13661,
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  "support_groups": 3,
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  "review_coverage": "0.25",
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  "contradict_groups": 0,
  "rounding_boundary": false,
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