PDS 70: A Very Young K-Type Star With Two Imaged Giant Planets

PDS 70 is a star 369 light-years away with two known planets. The star has a spectral type of K7 and is very young, with an age of 0.0054 billion years. Its mass is 0.76 solar masses, its radius is 1.26 solar radii, and its temperature is 3970 K. Its reported mass estimate is smaller than the Sun's, while its reported radius estimate is larger than the Sun's. Its reported temperature is cooler than the Sun's.

Both planets are Jupiter-like worlds discovered by imaging. PDS 70 b was discovered in 2018, and PDS 70 c was discovered in 2019. No orbital period is reported for either planet. PDS 70 b has a mass of 1020 Earth masses and a radius of 22 Earth radii. Its mass estimate is larger than Earth's and roughly 3.2 times Jupiter's mass, and its radius estimate is larger than Earth's. Its mean density is 0.528 g/cm³, 0.0959 times Earth's. PDS 70 c has a mass of 2380 Earth masses and a radius of 22.2 Earth radii. Its mass estimate is larger than Earth's and roughly 7.5 times Jupiter's mass, and its radius estimate is larger than Earth's. Its mean density is 1.2 g/cm³, 0.218 times Earth's. Among the listed planets, PDS 70 b has the smallest radius by reported estimates and the smallest reported mass, while PDS 70 c has the largest radius by reported estimates and the largest reported mass. Both planets are Jupiter-like, a size class that exceeds 4 times Earth's radius.