Gliese 357

GJ 357 is an M-type main sequence star with an unusually low star spot activity. It is located 31 light-years from the Solar System, in the Hydra constellation.

Planetary system

The star has three confirmed exoplanets in its orbit. One of these, Gliese 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone.
Transmission spectroscopy of the planet b with JWST in 2025 found no clear evidence for atmospheric molecules, although a secondary atmosphere is considered likely to exist. Similarly, another 2025 analysis of the JWST transmission spectrum found no atmospheric molecules, but was able to rule out an atmosphere composed mainly of low-molar mass molecules and an abundance of metals less than 300 times that of the Sun.