Kepler-1767 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1767 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1767, located approximately 2676.1 light-years (820.51 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.1105% across the stellar disk), this world measures 3.013 Earth radii (0.27 Jupiter radii) and has a measured mass of 9.34 Earth masses. Combining its mass and radius yields a mean bulk density of 1.88 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.03 g⊕ (10.1 m/s²), and an escape velocity of 19.7 km/s.

In its orbital architecture around Kepler-1767, Kepler-1767 b completes one full revolution every 59.658 Earth days at a semi-major axis of 0.2873 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 52.4 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 393 K (+120°C / +248°F) and receiving 5.66 S⊕ (~7,703 W/m²), Kepler-1767 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1767 is classified as a stellar host with an effective photospheric temperature of 5,243 K, a radius of 0.831 R☉, a mass of 0.887 M☉, an estimated bolometric luminosity of 0.468 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.6 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, Kepler-1767 shines at apparent V-band magnitude 16.206 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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