Sub-Neptune Planet Orbiting in “Habitable Zone” of Red Dwarf Star

Planets Orbiting Red Dwarf Star

Artist’s impression of planets orbiting a red dwarf. Credit: Mark Garlick

Led by the SAINT-EX Telescope

The SAINT-EX Observatory is a fully robotic facility hosting a 1-metre telescope based in Mexico. Credit: Institute of Astronomy, UNAM / E. Cadena

Observation of the star with the Las Cumbres Observatory Global Telescope subsequently ruled out the possibility that a planet with a 59-day orbital period was causing the drop in brightness. “Next, we wanted to find out if the 35-day orbital period could be possible,” explains Nicole Schanche.

The Mexico-based SAINT-EX telescope, co-operated by the CSH and the NCCR PlanetS, is purpose-built to study red dwarfs and their planets in more detail. SAINT-EX is an acronym that stands for Search And characterIsatioN of Transiting EXoplanets. The project was named in honor of Antoine de Saint-Exupéry (Saint-Ex), the famous writer, poet, and aviator. SAINT-EX observed a partial transit of TOI-2257 b and was able to confirm the exoplanet’s exact orbital period around its star, 35 days. “Another 35 days later, SAINT-EX was able to observe the entire transit, which gave us even more information about the properties of the system,” says co-author Robert Wells from the CSH, who was involved in the data processing.

A temperate planet with an irregular orbit

With its 35-day…

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