About this world
GJ 3634 b is a sub-Neptune orbiting GJ 3634, a cool red dwarf (type M2.5) 66.5 light-years from Earth. It is about 2.8 times the size of Earth (its size estimated from its mass) and holds 8.4 Earth masses. It completes an orbit every 2.65 days at 0.029 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 656 K (383 °C): far too hot for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2010 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.