About this world
IRAS 04125+2902 b is a gas giant orbiting IRAS 04125+2902, an orange dwarf 519 light-years from Earth. It is about 0.96 times the size of Jupiter. It completes an orbit every 8.83 days at 0.077 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 854 K (581 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium. Its atmosphere has already been studied: 2 spectroscopic observations, all of them with the James Webb Space Telescope.
It was discovered in 2024 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction.