Overview
- A Nature paper reports radial-velocity evidence that a companion with at least Jupiter’s mass orbits the brown dwarf CD-35 2722 b about 72 light‑years away.
- The signal comes from 23 high-precision VLT/CRIRES+ measurements that trace a roughly 170-day wobble in the brown dwarf’s motion.
- Because radial velocity yields only a minimum mass, the object’s true mass and orbital tilt are unconstrained which means it could be more massive than the reported lower bound.
- The paper’s authors use the neutral term “exosatellite” but external experts dispute that label and offer alternate explanations such as a planetary companion, a three-body configuration, or a substellar 'failed star.'
- Confirming the object's nature will require follow-up astrometry and direct imaging with current facilities and next-generation telescopes such as the ELT to pin down mass, orbit geometry, and formation history.