The chemical fingerprint of a planet reveals information about its formation history regarding when and where it formed. The water content of a planet can help to constrain its formation […]
sub-Neptune
Posted inAI - Data - Apps - Cybernetics, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Status Report
Modelling Non-Condensing Compositional Convection for Applications to Super-Earth and Sub-Neptune Atmospheres
Compositional convection is atmospheric mixing driven by density variations caused by compositional gradients. Previous studies have suggested that compositional gradients of atmospheric trace species within planetary atmospheres can impact convection […]
Posted inAtmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Water Absorption In The Transmission Spectrum Of The Water-world Candidate GJ9827d
Recent work on the characterization of small exoplanets has allowed us to accumulate growing evidence that the sub-Neptunes with radii greater than ∼2.5R⊕ often host H2/He-dominated atmospheres both from measurements […]
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report
The CARMENES Search For Exoplanets Around M Dwarfs. A Sub-Neptunian Mass Planet In The Habitable Zone Of HN Lib
We report the discovery of HN Lib b, a sub-Neptunian mass planet orbiting the nearby (d≈ = 6.25 pc) M4.0 V star HN Lib detected by our CARMENES radial-velocity (RV) […]
Posted inBiosignatures & Paleobiology, Exoplanets, -moons, -comets, Status Report, Water/Hycean Worlds & Oceanography
Conclusive Evidence For A Population Of Water Worlds Around M-dwarfs Remains Elusive
The population of small, close-in exoplanets is bifurcated into super-Earths and sub-Neptunes. We calculate physically motivated mass-radius relations for sub-Neptunes, with rocky cores and H/He dominated atmospheres, accounting for their […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Neptune
Atmospheric Dynamics Of Temperate Sub-Neptunes. Part I: Dry Dynamics
Sub-Neptunes (planets with radii between 2 and 4 R⊕) are abundant around M-dwarf stars, yet the atmospheric dynamics of these planets is relatively unexplored. In this paper, we aim to […]
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Neptune
TOI-712: A System Of Adolescent Mini-Neptunes Extending To The Habitable Zone
As an all-sky survey, NASA’s TESS mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study of the evolutionary processes […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Neptune
Reflected Spectroscopy Of Small Exoplanets I: Determining The Atmospheric Composition Of sub-Neptunes Planets
Direct imaging of widely separated exoplanets from space will obtain their reflected light spectra and measure their atmospheric properties, and small and temperate planets will be the focus of the […]
Posted inAstrochemistry, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Neptune
Methane As A Dominant Absorber In The Habitable-zone Sub-Neptune K2-18 b
In their Letter, Tsiaras et al.1 reported the detection of water vapour in the atmosphere of K2-18 b, an exoplanet of 7 to 10 Earth masses located in the habitable […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Neptune, Press Release
The Habitable-zone Planet Finder Reveals A High Mass and a Low Obliquity for the Young Neptune K2-25b
Using radial-velocity data from the Habitable-zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5-dwarf host star in the […]