10:15 〜 10:30
[PCG19-06] Towards a holistic understanding of sub-Neptunes
★Invited Papers
キーワード：Sub-Neptunes, Atmospheres, HD110067
The nature and origin of sub-Neptune-sized planets is arguably the hottest debate in the field of exoplanets nowadays. While absent in the Solar System, they are the most common planet type in the Galaxy. Multiple models (gas dwarfs, water worlds, Hycean planets) appear to explain current observational evidence from mass-radius measurements and demographic analyses. JWST promises to break those degeneracies, but the first robust results are yet to be published. In the meantime, the top priority is the discovery and characterization of benchmark targets amenable to these studies. In this talk, I will give an overview of the questions surrounding the origin of the "Radius gap", recent sub-Neptune discoveries such as the 6-planet resonant chain orbiting HD 110067, and the latest efforts in the community to detect molecular species in their atmospheres.