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A pivotal milestone in the search for exoplanetary habitability has arrived. Utilizing the James Webb Space Telescope’s Near-Infrared Imager and Slitless Spectrograph (NIRISS) alongside NIRSpec, an international astrophysical consortium has detected concrete evidence of a secondary, nitrogen-rich atmosphere encircling the temperate super-Earth LHS 1140b.
A Water World in the Habitable Zone
Located roughly 48 light-years from Earth in the constellation Cetus, LHS 1140b orbits a tranquil red dwarf star. Unlike the turbulent flare-prone TRAPPIST-1 system, the host star exhibits remarkably low magnetic activity, allowing the planet to preserve its volatile reservoir across billions of years. Mass-radius models indicate that LHS 1140b is not a dense rock, but likely a water-rich planet containing a global subsurface ocean or an ice-free bulls-eye sea under permanent zenith sunlight.
Transmission Spectroscopy Breakthrough
The transmission spectra collected during consecutive planetary transits reveal Rayleigh scattering slopes consistent with a high-mean-molecular-weight envelope, ruling out a puffy hydrogen-helium primordial haze. Crucially, subtle absorption bands corresponding to molecular nitrogen and carbon dioxide have been identified at a 3.8-sigma confidence level, cementing LHS 1140b as the foremost candidate for dedicated exobiological characterization throughout the coming decade.
