Top Qs
Timeline
Chat
Perspective
Gliese 357
Red dwarf with low starspot activity in the Hydra constellation From Wikipedia, the free encyclopedia
Remove ads
GJ 357 (Gliese 357) is an M-type main sequence star with an unusually low star spot activity.[9] It is located 31 light-years from the Solar System,[10] in the Hydra constellation.[10]
Remove ads
Planetary system
Summarize
Perspective
The star has three confirmed exoplanets in its orbit. [11] One of these, Gliese 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone.[12][10][13][14]
Transiting planets b and c are close to 3:7 mean-motion resonance. Presuming resonance chain extends to the outermost, cold, possibly terrestrial Gliese 357 d and the resonances are simple. 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.[15] 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 (less than 8 g/mol) and an abundance of metals less than 300 times that of the Sun.[16]
Remove ads
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads