LHS 475 b

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LHS 475 b
Artist's rendering of LHS 475b
Discovery
Discovered byJames Webb Space Telescope
Discovery date2023
Transit
Orbital characteristics[1]
2.0291±0.0000 d
StarLHS 475
Physical characteristics[1]
Mean radius
0.99±0.05 R🜨
Mass0.91±0.19 M🜨
Temperature586 K (313 °C, 595 °F)

LHS 475 b is a terrestrial planet orbiting the star LHS 475 which is about 40.7 light years away, in the constellation of Octans.[2][3] It was the first extrasolar planet to be confirmed by the James Webb Space Telescope.[4] It completes an orbit every 2 days and is 99% the diameter of Earth. It is also one of the most similar-to-Earth exoplanets discovered, in terms of radius.[5]

Physical characteristics

LHS 475 b has a radius equivalent to 99% of the Earth's radius and a mass equivalent to 91.4% of the Earth's mass.[6][7] It completes an orbit around its star in about 2 days and is most likely tidally locked.[7]

Atmosphere

It is not yet known whether LHS 475 b has an

atmospheric compositions that have not been ruled out, such as an atmosphere made up of 100% carbon dioxide, which is difficult to detect.[6][8] As it is very hot, with a temperature of 313 °C, if clouds are detected on its surface, this could suggest that LHS 475 b is similar to Venus, which has an atmosphere made up of carbon dioxide surrounded by thick clouds.[6]

Discovery and observation

The Transiting Exoplanet Survey Satellite (TESS) telescope indicated the existence of an exoplanet around the star LHS 475 through transit information.[6][9]

Transmission spectrum of LHS 475 b from NIRSpec.

On August 31, 2022, the James Webb Space Telescope's NIRSpec instrument captured the exoplanet with just two transit observations and observed its transmission spectrum. Confirmation of LHS 475 b by the James Webb Space Telescope was published on January 11, 2023.[10][11][12]

See also

References

  1. ^ a b "Open Exoplanet Catalogue - LHS 475 b".
  2. ^ "Exoplanet LHS 475 b and Its Star (Illustration)". WebbTelescope.org. Retrieved 2023-01-18.
  3. ^ Anderson, Natali (2023-01-12). "Webb Confirms Earth-Sized Planet around LHS 475 | Sci.News". Sci.News: Breaking Science News. Retrieved 2023-01-18.
  4. ^ Cowing, Keith (2023-01-12). "Webb Discovers LHS 475 b, An Earth-Sized, Rocky Planet". Astrobiology. Retrieved 2023-01-18.
  5. ^ Adkins, Jamie (2023-01-09). "NASA's Webb Confirms Its First Exoplanet". NASA. Retrieved 2023-01-18.
  6. ^ a b c d "NASA's Webb Confirms Its First Exoplanet - NASA". 2023-01-11. Retrieved February 22, 2023.
  7. ^ a b Martin, Pierre-Yves (2023). "Planet LHS 475 b". Extrasolar Planets Encyclopaedia. Retrieved February 22, 2023.
  8. ^ "James Webb Telescope finds its first exoplanet". NBC News. 2023-01-11. Retrieved February 22, 2023.
  9. ^ "LHS 475 b: Earth-Sized Exoplanet | Science Mission Directorate". science.nasa.gov. Retrieved February 22, 2023.
  10. ^ "James Webb Telescope finds its first exoplanet". NBC News. 2023-01-11. Retrieved February 22, 2023.
  11. ^ "How JWST confirmed its first exoplanet and opened a new frontier". The Planetary Society. Retrieved February 22, 2023.
  12. ^ "Exoplanet LHS 475 b (Transmission Spectrum)". Webb Space Telescope.
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