About this world
TOI-4559 b is a super-Earth orbiting TOI-4559, a cool red dwarf 103 light-years from Earth. It is about 1.4 times the size of Earth. It completes an orbit every 3.97 days at 0.036 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 554 K (281 °C): far too hot for liquid water on its surface. By the "cosmic shoreline", its star has probably stripped its atmosphere away, leaving bare rock.
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.