TOI-1408: A Distant Star With Two Known Worlds

TOI-1408 is a star located 455 light-years away. Its spectral type is F8 V, placing it among the hotter, more massive stars than the Sun. It has an age of 2.7 billion years, a mass of 1.31 solar masses, a radius of 1.53 solar radii, and a temperature of 6120 K. The star's reported mass and radius estimates are larger than the Sun's, and its reported temperature is hotter than the Sun's. Two planets are known to orbit this host.

TOI-1408 b is a Jupiter-like planet discovered in 2023 by the transit method. It has a mass of 593 Earth masses and a radius of 25 Earth radii. Its mass is roughly 1.87 times Jupiter's mass, and its mean density is 0.209 g/cm³, 0.038 times Earth's. It completes an orbit in 4.43 days.

TOI-1408 c is a Super-Earth discovered in 2024 by transit timing variations. It has a mass of 7.6 Earth masses and a radius of 2.22 Earth radii. Its mean density is 3.83 g/cm³, 0.695 times Earth's. It completes an orbit in 2.17 days. Among the listed planets, TOI-1408 c has the shortest year and the smallest radius and reported mass, while TOI-1408 b has the longest year and the largest radius and reported mass.