TOI-375 and Its Three Worlds

TOI-375 is a star located 1290 light-years away. It is 2.94 billion years old, has 1.44 solar masses, and spans 2.9 solar radii. Its temperature is 5260 K, making it cooler than the Sun. Both its mass and radius estimates are larger than the Sun's. Three planets orbit this host: TOI-375 b, TOI-375 c, and TOI-375 d.

TOI-375 b was discovered by the transit method in 2026, when the planet passed in front of its star from our viewpoint and caused a small dip in brightness. It is a Jupiter-like planet, with a radius of 10.8 Earth radii and a mass of 237 Earth masses. Both its radius and mass estimates are larger than Earth's, and its mean density is 1.04 g/cm³, 0.189 times Earth's. It completes an orbit in 9.45 days, the shortest year among the listed planets.

TOI-375 c was found by the radial velocity method in 2026, which measures the wobble a planet's gravity induces in its star's motion. Its minimum mass is 669 Earth masses, roughly 2.11 times Jupiter's mass and larger than Earth's, and it orbits every 116 days, the second-shortest year among the listed planets. TOI-375 d was also discovered by radial velocity in 2026. Its minimum mass is 446 Earth masses, roughly 1.4 times Jupiter's mass and larger than Earth's, and it completes an orbit in 298 days, the longest year among the listed planets.