The Dense Gaseous Envelope of Sub-Neptune Exoplanet HIP 116454 b
Located approximately 180 light-years from Earth in the constellation Pisces, HIP 116454 b stands as a quintessential specimen of the ' Sub-Neptune ' class—a category of celestial bodies that bridges the gap between terrestrial super-Earths and the massive gas giants of our own solar system. Orbiting its K-type orange dwarf host star at a blistering pace, this world represents a significant challenge to classical planetary formation models , which previously struggled to explain the abundance of these mid-sized objects. The physical profile of HIP 116454 b is characterized by its significant radius, which is roughly 2.5 times that of Earth, combined with a density that implies a substantial volatile-rich envelope. Unlike rocky worlds, this object possesses a deep, gaseous atmosphere that exerts immense pr...