Use SAO/NASA ADS to find astronomy papers, then use the NASA Exoplanet Archive to check planet and host-star context. To understand what a paper establishes, read its methods and evidence—not just its abstract—and keep the authors’ wording about whether a planet is a candidate, validated, or confirmed.
Where can you find exoplanet research papers?
SAO/NASA ADS is a literature search tool for astronomy and physics. It includes arXiv e-prints, so results can include preprints as well as journal publications. Search by an exoplanet’s name or a focused research phrase; ADS also supports searches by author, exact phrase, identifier, and year range. Check each record’s publication details and follow its available full-text link.
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For a named planet or host star, the NASA Exoplanet Archive adds catalog and data context. Its overview describes cross-referenced information about exoplanets and their host stars, along with tools for working with those data. Use the Archive to orient yourself and check catalog entries; use the paper to assess how a result was obtained.
| Resource | Best for | What to check |
|---|---|---|
| SAO/NASA ADS | Finding astronomy and physics literature, including arXiv e-prints | Whether the record is a preprint, a published paper, or has other publication information |
| NASA Exoplanet Archive | Checking catalog and host-star context and using data tools | The entry’s definition and current status; consult the paper for methods and evidence |
How do you tell what an exoplanet paper actually proves?
Start with the abstract to identify the question and headline result. Read the conclusion for the authors’ interpretation, then return to the methods and data sections to see what observations they analyzed, how they modeled them, what comparisons they made, and how they reported uncertainty. Figures and tables let you inspect which evidence supports a particular claim. Follow important citations when you need to understand how a finding relates to earlier work.
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This order is a practical reading approach, not a checklist prescribed by NASA. NASA’s overview explains that scientists analyze observations and test whether a signal still looks like a planet before writing a formal paper; journals then subject papers to peer review. Its description is a useful reminder that a reported result should be assessed through its analysis, not accepted solely because it appears in an abstract or catalog.
Keep each claim within the limits of the evidence. For example, the transit method measures how much starlight is blocked; deriving a planet’s radius also depends on the star’s size. A paper’s reported properties can therefore depend on both the observed signal and measurements or assumptions about the host star. See NASA’s explanation of the path from observation to confirmation for this distinction and the broader discovery process.
What is the difference between a candidate, a validated planet, and a confirmed planet?
These labels are not interchangeable. A candidate is a possible planet awaiting further scrutiny; its appearance in a project’s candidate table does not by itself make it confirmed. NASA’s 2018 educational explanation describes validation as a conclusion supported by scrutiny and, in its framing, more than 99 percent confidence. It distinguishes validation from confirmation. That percentage is the article’s explanatory threshold, not a universal statistical rule for every discovery claim.
When citing a result, use the status stated by the paper or catalog at the time you consult it. Check the Archive’s table definition and the individual object’s current status rather than inferring confirmation from a mission name, an observation, or a candidate listing. If a paper’s wording and a catalog label differ, explain which source and date you are reporting rather than silently upgrading the claim.
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How should you use catalog counts and background books?
Catalog totals change as entries are added or reclassified. The NASA Exoplanet Archive’s page showed 6,375 confirmed planets and 939 TESS confirmed planets on 2026-10-01; its TESS project candidate count was 8,148 on 2026-09-25. These are dated snapshots, not fixed totals. Include the as-of date whenever quoting them and consult the Archive for current counts.
For broad background, Michael Perryman’s The Exoplanet Handbook, second edition covers detection, formation, interiors, atmospheres, habitability, and research references. Published in 2018, it can provide a field-wide foundation, but it cannot substitute for newer papers or live catalog updates.
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