BALTIMORE — Utilizing its Near-Infrared Spectrograph (NIRSpec) and Mid-Infrared Instrument (MIRI), the James Webb Space Telescope has captured the most detailed atmospheric spectrum of a temperate habitable-zone exoplanet to date, confirming the presence of carbon-bearing molecules and water vapor.
Astrobiology Brief
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- Exoplanet K2-18b orbits within the habitable zone of red dwarf star K2-18 in the constellation Leo.
- Spectroscopic data confirms abundance of methane, carbon dioxide, and potential dimethyl sulfide (DMS) signatures.
- Supports the hypothesis of a Hycean world: a planet with a hydrogen-rich atmosphere and a liquid water ocean.
Decoding the Light of Distant Worlds
As the planet transited in front of its parent star, starlight filtered through the atmospheric rim, allowing Webb’s instruments to identify chemical fingerprints through transmission spectroscopy at unprecedented signal-to-noise ratios.
“We are no longer simply discovering planets; we are conducting comparative planetary climatology across interstellar distances,” stated Dr. Nikku Madhusudhan of Cambridge University’s Institute of Astronomy.