Kepler-1113 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1113 b is a confirmed sub-neptune exoplanet orbiting the star Kepler-1113, located approximately 3502.5 light-years (1073.88 parsecs) from the Solar System. First announced in 2016 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0485% across the stellar disk), this world measures 2.81 Earth radii and has a measured mass of 8.3 Earth masses. Combining its mass and radius yields a mean bulk density of 2.06 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.05 g⊕ (10.3 m/s²), and an escape velocity of 19.2 km/s.

In its orbital architecture around Kepler-1113, Kepler-1113 b completes one full revolution every 42.3 Earth days at a semi-major axis of 0.2415 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 62.1 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 558 K (+285°C / +545°F) and receiving 22.85 S⊕ (~31,097 W/m²), Kepler-1113 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1113 is classified as a stellar host with an effective photospheric temperature of 5,931 K, a radius of 1.17 R☉, a mass of 1.12 M☉, an estimated bolometric luminosity of 1.52 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.55 Gyr and a metallicity of [Fe/H] = 0.18 dex (metal-rich relative to the Sun). From Earth, Kepler-1113 shines at apparent V-band magnitude 14.943 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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