Gliese 357 Explained

GJ 357 (Gliese 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,[1] in the Hydra constellation.

Planetary system

The star has three confirmed exoplanets in its orbit. [2] One of these, Gliese 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone.[3] [4] [5]

Planets b and c are close to 3:7 mean-motion resonance. Presuming resonance chain extends to the outermost, cold, super-terrestrial Gliese 357 d and the resonances are simple, GJ 357 might have a more suitable planet for life with an approximate 27.5 day period and almost Earth's flux. Additionally, it might host a Mars-sized planet in 2:1 period ratio with GJ 357 c and 2:3 ratio with hypothetical HZ rocky planet.

Notes and References

  1. Web site: TESS Discovers Habitable Zone Planet in GJ 357 System. Reddy. Francis. Center. NASA’s Goddard Space Flight. 2019-07-31. SciTechDaily. en-US. 2019-08-01. 2019-08-01. https://web.archive.org/web/20190801162521/https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/. live.
  2. Web site: The Extrasolar Planet Encyclopaedia — Gj 357 b. 1995. Extrasolar Planets Encyclopaedia. 2019-08-01. 2023-11-07. https://web.archive.org/web/20231107150843/https://exoplanet.eu/catalog/gj_357_b--7109/. live.
  3. Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable , Axios, August 1, 2019
  4. Web site: Potentially habitable 'super-Earth' discovered just 31 light-years away. NBC News. 31 July 2019. en. 2019-08-01. 2019-07-31. https://web.archive.org/web/20190731230808/https://www.nbcnews.com/mach/science/potentially-habitable-super-earth-discovered-just-31-light-years-away-ncna1037491. live.
  5. Web site: NASA's TESS Helps Find Intriguing New World. Garner. Rob. 2019-07-30. NASA. 2019-08-01. 2019-08-01. https://web.archive.org/web/20190801045621/https://www.nasa.gov/feature/goddard/2019/confirmation-of-toasty-tess-planet-leads-to-surprising-find-of-promising-world/. live.

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