Jun 12
TOI-1883 b: the puffiest known super-Neptune orbiting an M dwarf, 383 light-years away Astronomers using the Subaru Telescope have measured the mass and density of TOI-1883 b, a super-Neptune 383 light-years away orbiting an M dwarf every 4.5 days. With a mean density of just 0.4 g/cm³, it is the puffiest super-Neptune ever found around this type of star — and a prime target for JWST atmospheric spectroscopy.... https://skycr.org/2026/06/12/toi-1883-b-super-neptune-m-dwarf/