Discovered in 2025, TOI-4507 b is a Neptune-like super-puff exoplanet orbiting a young F-type star (700 million years old) every 104.6 days at 0.456 AU. With a mass of 20-30 Earth masses and radius of 0.73 Jupiter radii (about 8.2 Earth radii), its density is remarkably low at around 0.3 g/cm³, challenging planetary formation theories. Its 82-degree polar orbit suggests dynamic early system interactions, possibly from stellar companions or disk instabilities. Though too hot for habitability (inner orbit beyond the HZ), it offers key insights into atmospheric puffiness, photoevaporation, and evolution in youthful systems, making it a benchmark for understanding low-density worlds.
