TOI-1338 b

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TOI-1338 b (also known as BEBOP-1 b or EBLM J0608-59 b) is a Saturn-sized exoplanet orbiting the binary star system TOI-1338. It is a circumbinary planet, meaning it orbits both stars. The planet and its two stars are located in the constellation Pictor, about 1,300 light-years (400 parsecs) from Earth. It is the innermost planet of the TOI-1338 planetary system, orbiting the stars' center of mass every 95 days at an average distance of 0.46 astronomical units (AU; 69 million km or 43 million mi). The planet has an average temperature of 630 K (357 °C; 674 °F). When viewed from Earth, the planet transits or passes in front of its parent stars and blocks out some of their light, allowing it to be detected by telescopes. TOI-1338 b was first detected by the Transiting Exoplanet Survey Satellite (TESS) in 2018 and recognized in 2019 by teenage NASA intern Wolf Cukier. It was the first circumbinary exoplanet discovered in TESS observations. Observations have shown that the planet has a radius close to Saturn's and a mass smaller than Uranus's, which gives it a very low density of around 0.14 g/cm3. This low density makes TOI-1338 b as a super-puff, a type of exoplanet thought to have a small core surrounded by a substantial amount of gas. Although the composition of TOI-1338 b is currently unknown, the James Webb Space Telescope is expected to determine the composition of its atmosphere with observations to be made in September 2026.