An exoplanet orbiting a dwarf star 124 light-years from Earth made headlines around the world in April 2025. Researchers at the University of Cambridge reported that planet K2-18b could be […]
sub-Neptune
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release
A Four-planet System Orbiting The Old Thick Disk Star TOI-1203
TOI-1203 is a bright (V=8.6) G3 V star known to host a transiting warm sub-Neptune on a 25.5 d orbit.
Posted inExoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report
Hydrocarbon Hazes On Temperate Sub-Neptune K2-18b Supported By Data From The James Webb Space Telescope
K2-18b, a sub-Neptune orbiting in the habitable zone of an M dwarf, has attracted significant interest following observations with the Hubble Space Telescope (HST) and, more recently, with the James […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
TOI-1438: A Rare System With Two Short-period Sub-Neptunes And A Tentative Long-period Jupiter-like Planet Orbiting A K0V star
We present the detection and characterisation of the TOI-1438 multi-planet system discovered by TESS.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Gas Giants, Imaging & Spectroscopy, Press Release
The HD 60779 Planetary System: A Transiting Sub-Neptune On A 30-day Orbit And A More Massive Outer World
We present the discovery of the planetary system orbiting the bright (V = 7.2), nearby (35 pc), Sun-like star HD 60779, which has a mass of 1.050 +/- 0.044 solar […]
Posted inExoplanets, -moons, -comets, Ice Giant, Icy Worlds, Press Release
New Model Aims To Demystify Steam Worlds Beyond Our Solar System
For astrobiologists, the search for life beyond our solar system could be likened to where one would look in a vast desert—essentially, where there’s water. And it turns out that […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Discovery Of A Multi-planetary System Orbiting The Aged Sun-like Star HD 224018
In 2016, Kepler/K2 detected a system of two sub-Neptunes transiting the star HD 224018, one of them showing a mono-transit event.
Posted inAstrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release
Carbon-rich Sub-Neptune Interiors Are Compatible With JWST Observations
Many possible interior compositions exist for sub-Neptunes: ice-poor, ice-rich, and water-dominated interiors can all match the measured masses and radii.
Posted inAtmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
The Impact Of Organic Hazes And Graphite On The Observation Of CO2-rich Sub-Neptune Atmospheres
Many sub-Neptune and super-Earth exoplanets are expected to develop metal-enriched atmospheres due to atmospheric loss processes such as photoevaporation or core-powered mass loss.
Posted inAtmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Formation Of Organic Hazes In CO2-rich Sub-Neptune Atmospheres Within The Graphite-stability Regime
Super-Earths and sub-Neptunes are the most common exoplanets, with a “radius valley” suggesting that super-Earths may form by shedding sub-Neptunes’ gaseous envelopes.