New analysis of the nearby LHS 1140 system: LHS 1140 b is either a temperate mini-Neptune or a water world

24. 10. 2023 (accepted)

New analysis of the nearby LHS 1140 system: LHS 1140 b is either a temperate mini-Neptune or a water world

Star system: LHS 1140 | Distance from the Sun: 48.8 light years

A new analysis of LHS 1140 b and c, two temperate exoplanets orbiting a nearby star, reveals that LHS 1140 b is likely a mini-Neptune with a thin H/He envelope or a water world. LHS 1140 c remains consistent with a rocky planet, but there is a discrepancy in the transit depths measured by Spitzer and TESS. The candidate LHS 1140 d is not detected, and is attributed to stellar activity.

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New Mass and Radius Constraints on the LHS 1140 Planets -- LHS 1140 b is Either a Temperate Mini-Neptune or a Water World external link

Stars mentioned

LHS 1140

M4.5V, Red dwarf

mass: 0.18 M☉

radius: 0.3 R☉

distance: 48.8 ly

stars in the system: 1

exoplanets: 3

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LHS 1140 48.8 ly		Variable X-ray flux may explain variable helium escape from the habitable-zone exoplanet LHS 1140b 29. 9. 2026
LHS 1140 48.8 ly		No Persistent Helium Absorption in LHS 1140 b: Four JWST/NIRISS SOSS Transits and Multi-epoch Stellar He I Variability 23. 8. 2026
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