TOI-1130: A Cool Star With Two Transiting Planets

TOI-1130 is a K7 star located 190 light-years away. Its mass is 0.684 solar masses, its radius is 0.687 solar radii, its temperature is 4250 K, and its age is 8.2 billion years. Both reported measurements place it below the Sun in mass and radius, and at 4250 K it is cooler than the Sun. The star hosts two known planets, both discovered by transit in 2020.

TOI-1130 b is a Neptune-like planet with an orbital period of 4.07 days, a radius of 3.66 Earth radii, and a mass of 19.8 Earth masses. Its radius is larger than Earth's, as is its mass, and its mean density is 2.23 g/cm³, 0.404 times Earth's. Among the listed planets, TOI-1130 b has the shortest year, the smallest radius, and the smallest reported mass.

TOI-1130 c is a Jupiter-like planet with an orbital period of 8.35 days, a radius of 13 Earth radii, and a mass of 336 Earth masses. Its radius is larger than Earth's, and its mass is larger than Earth's as well, at roughly 1.06 times Jupiter's mass. Its mean density is 0.843 g/cm³, 0.153 times Earth's. Among the listed planets, TOI-1130 c has the longest year, the largest radius, and the largest reported mass.