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Planetary-mass exosatellite detected around the substellar companion of a star

Nature Exoplanet Astronomy Kevin Hoy, Alice Zurlo, Pablo A Peña R, Jana Köhler, Silvano Desidera, Raffaele Gratton, Cecilia Lazzoni, Simon Petrus, Florian Rodler, Jonathan Smoker, Valentina D’Orazi, Ilaria Carleo, Ilaria Giovannini 2026-07-22

TL;DR - Radial-velocity measurements indicate a Jupiter-mass satellite orbiting the brown dwarf companion CD-35 2722 B. The finding is a promising detection of an exomoon-like planetary-mass object.

Published online in Nature on 22 July 2026.
The host is a substellar companion to a star.
The evidence comes from radial-velocity measurements.
The object’s reported mass is comparable to Jupiter’s.

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