Tag

Sub Neptune

All articles tagged with #sub neptune

space3 hours ago•6 min saved

Twice-Earth-Sized Hot Sub-Neptune TOI-5734 b Uncovered

An international team using TESS and HARPS-N confirmed TOI-5734 b, a hot sub-Neptune about 2.1 Earth radii and 9.1 Earth masses orbiting the young K-dwarf TOI-5734 every 6.18 days at roughly 0.06 AU (about 106 light-years away). With an equilibrium temperature around 688 K, the planet lies near the upper edge of the radius valley and is likely rocky with a largely stripped atmosphere, though a water-world scenario cannot be ruled out. The discovery, described in a February 2026 arXiv paper (DOI 10.48550/arxiv.2602.18108), leveraged three TESS sectors and HARPS-N data to illuminate atmospheric loss and inward migration in close-in exoplanets.

via The Daily Galaxy|

#exoplanets #harps-n #space

space1 month ago•75 min saved

Stellar radiation sculpts four young planets into super-Earths

Astronomers weigh four young, bloated planets around the infant star V1298 Tau and find they are extremely low density and actively losing their atmospheres to photoevaporation. Using transit timing variations, the team shows the planets are on track to shed most of their atmospheres, evolving into rocky super‑Earths or mini-Neptunes, suggesting a common outcome for such compact planetary systems.

via Space|

#exoplanets #photoevaporation #space

science5 months ago•4 min saved

New Study Suggests Earth and Many Exoplanets Are Less Unique Than Previously Thought

New research indicates that planets outside our solar system, including the exoplanet K2-18b, contain far less surface water than previously believed, challenging earlier theories of water-rich worlds and suggesting Earth may be more typical than extraordinary. The study highlights the importance of chemical interactions between planetary atmospheres and interiors in determining water content, which has implications for the search for extraterrestrial life.

via SciTechDaily|

#astrobiology #exoplanets #planetary-formation

science6 months ago•4 min saved

Steam Worlds and Sub-Neptunes: New Frontiers in the Search for Extraterrestrial Life

Scientists have developed a new model to better understand 'steam worlds,' planets too hot for liquid water and filled with water vapor, which could help in the search for habitable planets. The model considers exotic water states like supercritical water and superionic ice, and is relevant for interpreting observations from telescopes like JWST and future missions like ESA's PLATO. This research enhances our understanding of the most common types of exoplanets and their potential for hosting life.

via Space|

#exoplanets #planetary-modeling #science

science9 months ago•4 min saved

Webb Telescope Finds Water Vapor on a Small Exoplanet

NASA's James Webb telescope detected water vapor on the small, hot exoplanet TOI-421 B, a sub-neptune with a clear, hydrogen-rich atmosphere lacking methane and carbon dioxide, challenging previous assumptions about such planets' atmospheres and offering new insights into their formation and evolution.

via Earth.com|

#atmosphere #exoplanet #science