About this world
GJ 27.1 b is a sub-Neptune orbiting GJ 27.1, a cool red dwarf (type M0.5V) 77 light-years from Earth. It is about 3.7 times the size of Earth (its size estimated from its mass), with at least 13 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 15.8 days at 0.1 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 387 K (114 °C): too cold for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2014 by radial velocity with Multiple Observatories. The star wobbles toward and away from us, Doppler-shifting its spectrum.