Exoplanet Detection, Validation, and Confirmation

Working definition

An exoplanet claim connects a repeatable signal to a planetary interpretation while testing astrophysical and instrumental false positives. Detection method, disposition, host-star properties, literature source, completeness, and the distinction between measured and composite parameters must remain explicit.

What is measured

Transit surveys measure periodic brightness changes.
Spectroscopy measures host-star radial velocities.
Astrometry, microlensing, timing, and direct imaging supply other signatures.

What is inferred

Planet radius, mass, orbit, and equilibrium quantities combine observables with host-star and model parameters.
Validation or confirmation evaluates false-positive alternatives.
Occurrence rates require survey completeness and reliability models.

Fact-layer dependency

The explanatory layer cannot rewrite these fields.

Fact schema →

time.utcInstantobserver.positionsubject.identifiersreference.framecoordinates.valuescoordinates.uncertaintyprovenance.provider

What is observed

Transit surveys measure periodic brightness changes. Spectroscopy measures host-star radial velocities. Astrometry, microlensing, timing, and direct imaging supply other signatures.

Calibrated measurement[1]

The NASA Exoplanet Archive preserves confirmed planets, candidates, false-positive dispositions, host properties, and discovery data as distinct records.

Boundary: A candidate is not a confirmed planet.

How inference enters

Planet radius, mass, orbit, and equilibrium quantities combine observables with host-star and model parameters. Validation or confirmation evaluates false-positive alternatives. Occurrence rates require survey completeness and reliability models.

Model-dependent[1][2]

Planetary radius, mass, and orbit are inferred from signals combined with stellar parameters and a detection model.

Boundary: The host star is correctly identified and characterized.

Limits and unresolved questions

A candidate is not a confirmed planet. Composite catalog parameters can combine different references. Detection methods favor different orbital and physical populations.

Open question[2]

Catalog disposition can change, and detection completeness differs strongly across methods and target populations.

Boundary: Detection methods favor different orbital and physical populations.

Sources

Each source states both what it establishes and where its authority ends. Access dates record the last public verification.

[1]NASA Exoplanet Archive Overview and Holdings · NASA Exoplanet Science Institute · accessed 2026-08-15
Establishes: Vetted exoplanet and host-star data, literature provenance, light curves, spectra, radial velocities, and distinct confirmed, candidate, and false-positive dispositions.
Boundary: Archive inclusion and default parameter selection do not eliminate publication disagreement, correlated errors, completeness limits, or later reclassification.
[2]Gaia Mission Science · European Space Agency · accessed 2026-08-15
Establishes: Gaia measurement domains: astrometry, photometry, spectroscopy, stellar position, parallax, proper motion, brightness, and radial velocity.
Boundary: Mission objectives and measurement definitions do not make every catalog value equally precise or free of selection and calibration effects.