WASP-66 b

Astrophysical Synthesis & Habitability Characterization

WASP-66 b is a confirmed gas giant exoplanet orbiting the star WASP-66, located approximately 1631.6 light-years (500.26 parsecs) from the Solar System. First announced in 2012 by SuperWASP using the Transit detection technique (producing an estimated primary transit depth of 0.6682% across the stellar disk), this world measures 15.693 Earth radii (1.4 Jupiter radii) and has a measured mass of 746.901 Earth masses (2.35 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.07 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.03 g⊕ (29.71 m/s²), and an escape velocity of 77.2 km/s.

In its orbital architecture around WASP-66, WASP-66 b completes one full revolution every 4.086 Earth days at a semi-major axis of 0.0546 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 145.4 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.

⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1570 K (+1297°C / +2367°F) and receiving 1,434.77 S⊕ (~1,952,727 W/m²), WASP-66 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star WASP-66 is classified as a stellar host with an effective photospheric temperature of 6,600 K, a radius of 1.76 R☉, a mass of 1.33 M☉, an estimated bolometric luminosity of 5.273 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.7 Gyr and a metallicity of [Fe/H] = -0.31 dex (metal-poor relative to the Sun). From Earth, WASP-66 shines at apparent V-band magnitude 11.605 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere.

Discovery Facility: SuperWASP · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).