Kepler-1831 b

Astrophysical Synthesis & Habitability Characterization

Kepler-1831 b is a confirmed super-earth exoplanet orbiting the star Kepler-1831, located approximately 3436 light-years (1053.49 parsecs) from the Solar System. First announced in 2021 by Kepler using the Transit detection technique (producing an estimated primary transit depth of 0.0319% across the stellar disk), this world measures 1.97 Earth radii and has a measured mass of 4.54 Earth masses. Combining its mass and radius yields a mean bulk density of 3.27 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.17 g⊕ (11.47 m/s²), and an escape velocity of 17 km/s.

In its orbital architecture around Kepler-1831, Kepler-1831 b completes one full revolution every 5.784 Earth days at a semi-major axis of 0.0655 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 123.2 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 1051 K (+778°C / +1432°F) and receiving 288.69 S⊕ (~392,907 W/m²), Kepler-1831 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.

The host star Kepler-1831 is classified as a stellar host with an effective photospheric temperature of 6,063 K, a radius of 1.012 R☉, a mass of 1.117 M☉, an estimated bolometric luminosity of 1.242 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.3 Gyr and a metallicity of [Fe/H] = 0.07 dex (metal-rich relative to the Sun). From Earth, Kepler-1831 shines at apparent V-band magnitude 15.158 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.

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