Super-Neptunes, also known as sub-Saturns, are a rare population of exoplanets that have properties between that of Neptune and Saturn (20-100 M🜨, 4-8 R🜨, 0.687-1.64 g/cm3). According to the core-accretion model of planet formation, most planets that reach a ~20 M🜨 threshold are expected to rapidly expand to gas giant sizes (≥100 M🜨) in a mechanism known as runaway gas accretion.
Super-Neptunes, also known as sub-Saturns, are a rare population of exoplanets that have properties between that of Neptune and Saturn (20-100 M🜨, 4-8 R🜨, 0.687-1.64 g/cm3). According to the core-accretion model of planet formation, most planets that reach a ~20 M🜨 threshold are expected to rapidly expand to gas giant sizes (≥100 M🜨) in a mechanism known as runaway gas accretion.
Source: Wikipedia "Super-Neptune" · CC BY-SA 4.0
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