Latest Space Breaking News: Proto-sub-Neptune detected with metal-poor atmosphere and a hot interior

Link: https://phys.org/news/2025-07-proto-neptune-metal-poor-atmosphere.html

Summary: Astronomers have characterized the atmosphere of a young (20 Myr old) transiting exoplanet and found it to be unusually clear and puffy. By analyzing the planet's atmospheric features, they were able to precisely measure the planet's mass surpassing traditional dynamical techniques like radial velocity, which poorly perform with such active young stars. They found that V1298 Tau b is a proto-sub-Neptune, still hot and inflated from its recent formation.