About this world
TOI-1685 b is a super-Earth orbiting TOI-1685, a cool red dwarf (type M3V) 123 light-years from Earth. It is about 1.4 times the size of Earth and holds 3.1 Earth masses. It completes an orbit every 16.1 hours at 0.012 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,000 K (727 °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. Its atmosphere has already been studied: 10 spectroscopic observations, 8 of them with the James Webb Space Telescope.
It was discovered in 2021 by transit with Transiting Exoplanet Survey Satellite (TESS). A planet crosses its star and dims it by a tiny, periodic fraction.