{"schema":"hottub-news/story/v1","story":"st_x2gjactnk6cvaphbvvsq","title":"Hybrid worlds are the commonest outcome among the M-dwarf sub-Neptunes characterised with JWST","title_en":null,"outlets":1,"brief":null,"page":"https://hottub.news/stories/hybrid-worlds-are-the-commonest-outcome-among-the-m-dwarf-sub-neptunes-x2gjactnk6","count":1,"items":[{"id":"n_x2gjactnk6cvaphbvvsq","seq":608092,"kind":"research","title":"Hybrid worlds are the commonest outcome among the M-dwarf sub-Neptunes characterised with JWST","url":"https://arxiv.org/abs/2609.34635","summary":"arXiv:2609.34635v1 Announce Type: new Abstract: The sub-Neptunes orbiting M dwarfs are usually assigned to one of two classes: rocky cores beneath primordial hydrogen, or volatile-rich bodies formed beyond the water-ice line. Bulk density cannot distinguish them, the two being degenerate in mass and radius once envelope evolution is modelled self-consistently (Rogers et al. 2023); the atmospheric mean molecular weight {\\mu} is the route past it. We compile the eight M-dwarf…","published":"2026-09-29T04:00:00Z","seen":"2026-09-29T07:46:41Z","lang":"en","source":{"id":"arxiv-astro-ph","name":"arXiv astro-ph (astrophysics)","domain":"arxiv.org","outlet":{"wikidata":"Q118398","name":"arXiv","type":"website","country":"US","designations":["bibliographic database","disciplinary repository","online database","open science tool","preprint server","website"]}},"via":"arxiv-astro-ph","topics":["space","astrophysics","astro-ph.ep"],"authors":["Juan F. Pag\\'es Navarrete"],"entities":[{"id":"Q186447","name":"James Webb Space Telescope","type":"other"}],"story":"st_x2gjactnk6cvaphbvvsq","category":"science-technology","category_p":0.6100000143051147,"sentiment":"neutral","tone":-0.019999999552965164,"political":0.019999999552965164}]}