ESA’s Cheops Mission Extends Operations to Uncover Unique Exoplanets

The European Space Agency’s (ESA) Cheops mission, launched in December 2019, has extended its operations beyond initial plans, continuing to uncover unique exoplanets such as the “rugby ball” shaped WASP-103b and resonant planetary systems, according to recent findings. The satellite, developed by the University of Bern, has already identified over 600 exoplanets since its inception, including anomalies that challenge existing astrophysical theories.

What is the Cheops mission?

The Characterizing ExOPlanets Satellite (Cheops) is an ESA mission designed to study exoplanets discovered by other telescopes. Built by the University of Bern, it focuses on measuring the size of exoplanets by observing transits—when a planet passes in front of its star, dimming the starlight. Originally planned for a three-year lifespan, the mission has now entered its second extension, allowing for continued observations of distant planetary systems.

What exoplanets has Cheops discovered?

Cheops has identified several unique exoplanets, including WASP-103b, whose elongated shape resembles a rugby ball due to tidal forces from its star. This gas giant, orbiting its star every 24 hours, is nearly twice the size of Jupiter. The mission also observed the LHS 1903 system, where planets align in a rare “resonant” configuration, a phenomenon occurring in about 1% of known planetary systems. Additionally, Cheops detected LTT9779b, a planet with metal-rich clouds in its atmosphere that reflect 80% of incoming light, making it one of the most reflective exoplanets discovered.

How has the mission extended its operations?

Cheops was initially designed as an “S-Mission” with a small budget and a planned three-year lifespan. However, its success in characterizing exoplanets led to two extensions, with operations now set to continue through 2025. The mission’s flexibility and focus on high-priority targets have allowed it to adapt to new scientific opportunities, such as studying planetary systems with unusual configurations.

Why are these discoveries significant?

The findings challenge existing models of planetary formation. For instance, the LHS 1903 system defies the typical pattern of rocky planets near stars and gas giants farther out, suggesting gaps in current theories. Similarly, WASP-103b’s extreme tidal deformation provides insights into the effects of intense stellar gravity. These observations build on the legacy of Swiss astronomers Didier Queloz and Michel Mayor, who won the 2019 Nobel Prize in Physics for discovering the first exoplanet around a sun-like star, 51