CD-35 2722 B b

Astrophysical Synthesis & Habitability Characterization

CD-35 2722 B b is a confirmed gas giant exoplanet orbiting the star CD-35 2722 B. First announced in 2026 by Paranal Observatory using the Radial Velocity detection technique (measuring periodic Doppler reflex motion in the host star's spectrum), this world measures 13.9 Earth radii (1.24 Jupiter radii) and has a measured mass of 292.402 Earth masses (0.92 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.6 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.51 g⊕ (14.81 m/s²), and an escape velocity of 51.3 km/s.

In its orbital architecture around CD-35 2722 B, CD-35 2722 B b completes one full revolution every 171.11 Earth days at a semi-major axis of 0.2 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 12.7 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.27, swinging from 0.146 AU at periapsis out to 0.254 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.

❄️ Thermal Regime (Cryogenic Zone): With an equilibrium temperature of 77 K (-196°C / -321°F) and an incident flux of 0.01 S⊕ (~8 W/m²), surface water and volatile species on CD-35 2722 B b would remain locked in cryogenic ice phases unless warmed by subsurface tidal or radiogenic heating.

The host star CD-35 2722 B is classified as an ultra-cool L-dwarf of spectral type L4.5 V with an effective photospheric temperature of 1,800 K, a radius of 0.159 R☉, a mass of 0.035 M☉, an estimated bolometric luminosity of 0.00024 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.1 Gyr and a metallicity of [Fe/H] = 0.27 dex (metal-rich relative to the Sun).

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