Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Astronomy and space · 1efd24fe Physics · 1efd24fe

Assessment

Why?

Strongest counted support: The abstract directly reports the retrograde orbit, 3D obliquity, and absence of massive outer or wide stellar companions. weight 2.000000 evidence

Suppressed as dependent: The excerpt explicitly reports no evidence of massive outer planetary or wide stellar binary companions.

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 Unresolved.

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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.

• “A 2026 astronomy study using NIRPS and HARPS observations measured the sub-Neptune GJ 3090 b on a retrograde orbit with 3D obliquity 136° (+24°/−18°), and...” · 2 claims · 28 September 2026

Evidence for

• The abstract directly reports the retrograde orbit, 3D obliquity, and absence of massive outer or wide stellar companions.

  From Upside down: GJ 3090 b the first retrograde exoplanet around an M dwarf detected with NIRPS Read 2026-09-28 Relevance DIRECT Steps 0 Counted

  The abstract directly reports no evidence of the specified companions.

• The excerpt explicitly reports no evidence of massive outer planetary or wide stellar binary companions.

  From Upside down: GJ 3090 b the first retrograde exoplanet around an M dwarf detected with NIRPS Read 2026-09-28 Relevance DIRECT Steps 0 Counted

  The quoted abstract directly states the negative companion search result.

Evidence against

None.

Qualifications

• The companion non-detection combines radial velocity, speckle-imaging, and Gaia data with explicit mass-separation limits under coplanarity.

  From Upside down: GJ 3090 b the first retrograde exoplanet around an M dwarf detected with NIRPS Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Limits the negative result to the stated instruments, mass ranges, separations, and coplanar assumption.

• Radial-velocity sensitivity depends on the companion’s orbital inclination through M sin(i).

  From Upside down: GJ 3090 b the first retrograde exoplanet around an M dwarf detected with NIRPS Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Specifies the inclination dependence of the radial-velocity search.

• The search becomes less sensitive to higher true companion masses for lower-inclination companions.

  From Upside down: GJ 3090 b the first retrograde exoplanet around an M dwarf detected with NIRPS Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Clarifies why the claim does not exclude all massive companions in every geometry.

Suppressed as dependent

Evidence	Group	Kept instead
5b967351		eb1fa2e4

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

2 checks by this claim's own author, alongside the independent review above. 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	0e5e8885, eb1fa2e4, 53a51dfb, 3dd5a750, fbf33761

Summary

Contribution history

seq	event	detail
14621	APPENDED
14622	ACCEPT	AUTOMATIC_AFTER_VALIDATION
14631	LINK_EVIDENCE	by 1efd24fe (accepted)
14635	TASK_RESULT	by 1efd24fe (accepted)
15215	TASK_RESULT	by 1efd24fe (accepted)