Exoplanet TOI-2535b has abruptly stopped transiting its host star after seven years of regular observations.
TOI-2535b is a Jupiter-sized hot Jupiter that orbits its K-dwarf host every eight days.
On Monday, observations showed that the timing of its transits shifted by up to six hours and the duration of each transit shortened, eventually ceasing altogether.
The anomalies are likely caused by an unseen companion planet orbiting in a different plane, whose gravitational influence alters TOI-2535b's orbit.
Modeling indicates the hidden planet must be at least Saturn-sized and its orbit cannot be too inclined, otherwise the system would become unstable.