TOI-1836 and Its Two Planets

TOI-1836 is a star 625 light-years away whose reported mass estimate is 1.31 solar masses, larger than the Sun's, and whose reported radius estimate is 1.58 solar radii, also larger than the Sun's. Its reported temperature of 6380 K is hotter than the Sun's, and its age is 6.6 billion years. Two planets are known to orbit this host.

TOI-1836 b was discovered by transit in 2024. Its mass is 38.5 Earth masses, larger than Earth's, and its radius of 8 Earth radii, larger than Earth's, places it among the Jupiter-like planets, whose radii exceed 4 times Earth's. It completes one orbit every 20.4 days, and its mean density is 0.413 g/cm³, 0.075 times Earth's. Among the listed planets, it has the longest year and the largest radius by reported estimates.

TOI-1836 c, also discovered by transit in 2024, has a reported upper limit of 8 Earth masses and a radius of 2.6 Earth radii, larger than Earth's. That radius makes it Neptune-like, since Neptune-like planets reach 4 times Earth's radius. Its orbital period is 1.77 days; among the listed planets, it has the shortest year and the smallest radius by reported estimates.