WTS-2 and Its Jupiter-Like Planet

WTS-2 is a K2 V star, a main-sequence dwarf whose spectral class places it cooler than the Sun. Its reported mass estimate is 0.82 solar masses, and its reported radius estimate is 0.752 solar radii, both smaller than the Sun's. The star's reported temperature is 5000 K, cooler than the Sun's, and its age carries a reported lower limit of 0.6 billion years. One planet orbits this host.

That planet is WTS-2 b, a Jupiter-like world discovered by transit in 2014. A transit occurs when a planet passes in front of its star from our viewpoint, dimming the observed brightness; repeated dips help establish orbital periods. WTS-2 b circles its star in just 1.02 days. Its radius of 15.3 Earth radii is larger than Earth's and well beyond the threshold that defines the Jupiter-like class. Its mass estimate of 356 Earth masses is larger than Earth's. The planet's mean density is 0.55 g/cm³, 0.0998 times Earth's.