LHS 1140b shows 1.24% metastable helium absorption during a 2024 transit, absent in 2025, pointing to variable escape from a helium-dominated upper atmosphere.
Nature Astronomy , year = 2025, month = jul, volume =
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A proposed 35 cm space telescope combining simultaneous ultraviolet and visible spectroscopy with near-infrared photometry could characterize the atmospheres of dozens of transiting exoplanets in a single campaign.
Four JWST NIRISS/SOSS transits detect no metastable helium absorption on LHS 1140 b, rejecting the reported ground-based detection at more than 3 sigma per visit and about 10 sigma combined.
A compact NASA smallsat design achieves projected EUV sensitivity exceeding the EUVE Deep Survey Spectrometer by using a new grazing-incidence telescope, an etched silicon grating, and an advanced microchannel plate detector.
Water- and metal-rich atmospheres on compact hot mini-Neptunes lose mass more slowly than H/He cases at high enrichment levels due to enhanced cooling and higher mean molecular weight.
citing papers explorer
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Helium escaping from the atmosphere of a nearby rocky exoplanet orbiting in a habitable zone
LHS 1140b shows 1.24% metastable helium absorption during a 2024 transit, absent in 2025, pointing to variable escape from a helium-dominated upper atmosphere.
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WALTzER: Wide-band Atmospheric Laboratory for Transiting Exoplanet Research
A proposed 35 cm space telescope combining simultaneous ultraviolet and visible spectroscopy with near-infrared photometry could characterize the atmospheres of dozens of transiting exoplanets in a single campaign.
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No Helium Detected in LHS 1140 b from Four JWST NIRISS/SOSS Transits
Four JWST NIRISS/SOSS transits detect no metastable helium absorption on LHS 1140 b, rejecting the reported ground-based detection at more than 3 sigma per visit and about 10 sigma combined.
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Optomechanical Design of the MANTIS SmallSat: An Extreme-, Far- and Near-Ultraviolet Spectrograph for Exoplanet Host Stars
A compact NASA smallsat design achieves projected EUV sensitivity exceeding the EUVE Deep Survey Spectrometer by using a new grazing-incidence telescope, an etched silicon grating, and an advanced microchannel plate detector.
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Escape of Water- and Metal-enriched Atmospheres from compact Hot mini-Neptunes with CHAIN
Water- and metal-rich atmospheres on compact hot mini-Neptunes lose mass more slowly than H/He cases at high enrichment levels due to enhanced cooling and higher mean molecular weight.