Breakthrough Tracker record
A planetary-mass exosatellite candidate around CD-35 2722 B
High-resolution radial-velocity monitoring with VLT/CRIRES+ found an approximately 170-day wobble in the young brown dwarf CD-35 2722 B. The preferred interpretation includes an orbiting companion with a minimum mass of about 0.9 Jupiter masses.
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- Stable ID
cd-35-2722-b-exosatellite-2026- Revision
cd-35-2722-b-exosatellite-2026.v1- Field
- Astronomy · Exoplanets and substellar systems
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Provisional · Peer-reviewed candidate; confirmation pending
- Last checked
AI role
No substantive AI role was disclosed in the inspected paper or official research summary.
Record details
- Problem or result
- Detecting a natural satellite outside the Solar System
- Authors
- Kevin Hoy, Alice Zurlo, P. A. Peña R. et al.
- Institutions
- European Southern Observatory; Universidad Diego Portales; Millennium Nucleus on Young Exoplanets and their Moons; collaborating observatories
- Result date
- Published July 22, 2026
Why it matters
The result is strong peer-reviewed evidence for a planetary-mass satellite around an extrasolar substellar object and demonstrates a radial-velocity route to satellite systems beyond the Solar System.
Limits
The host is a brown dwarf orbiting a star, not a planet, so calling the object an exomoon is partly definitional. The satellite interpretation still needs independent or astrometric confirmation, and radial velocity supplies a minimum rather than a true mass.
Sources
- Primary: Nature, Planetary-mass exosatellite detected around the substellar companion of a star
- Primary: Initial pre-peer-review manuscript
- Independent: European Southern Observatory research summary
- Independent: Physics World analysis
Correction and revision history
- July 22, 2026 — Added from the final peer-reviewed Nature paper. Values follow the published article rather than the earlier preprint; the satellite interpretation remains provisional pending independent confirmation.
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