TOI-3837 b
Astrophysical Synthesis & Habitability Characterization
TOI-3837 b is a confirmed gas giant exoplanet orbiting the star TOI-3837, located approximately 1016.6 light-years (311.71 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.69% across the stellar disk), this world measures 10.873 Earth radii (0.97 Jupiter radii) and has a measured mass of 187.519 Earth masses (0.59 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.8 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.59 g⊕ (15.59 m/s²), and an escape velocity of 46.5 km/s.
In its orbital architecture around TOI-3837, TOI-3837 b completes one full revolution every 11.889 Earth days at a semi-major axis of 0.099 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 90.6 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.221 carries the world between 0.0771 AU at periapsis and 0.1209 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1178 K (+905°C / +1661°F) and receiving 138.07 S⊕ (~187,906 W/m²), TOI-3837 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3837 is classified as a stellar host with an effective photospheric temperature of 5,905 K, a radius of 1.2 R☉, a mass of 0.89 M☉, an estimated bolometric luminosity of 1.571 L☉. Stellar evolution modeling indicates an estimated stellar age of 11.2 Gyr and a metallicity of [Fe/H] = -0.26 dex (metal-poor relative to the Sun). From Earth, TOI-3837 shines at apparent V-band magnitude 11.673 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere.
Methodology: Computed using the Schulze-Makuch et al. (2011) weighted metric comparing physical interior (radius, estimated density) and surface thermal regime (escape velocity, equilibrium temperature).
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-3837 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,905 K |
| Stellar Radius | 1.2000 R☉ |
| Stellar Mass | 0.8900 M☉ |
| Bolometric Luminosity | 1.571 L☉ |
| Metallicity [Fe/H] | -0.260 dex |
| Stellar Age | 11.200 Gyr |
| Apparent Magnitude | V: 11.673 · G: 11.804 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.099000 AU |
| Orbital Period | 11.889 days |
| Mean Orbital Velocity | 90.6 km/s |
| Orbital Eccentricity (e) | 0.22100 |
| Orbital Inclination (i) | 88.0000° |
| Mean Bulk Density | 0.8 g/cm³ (46.5 km/s vesc) |
| Insolation Flux | 138.0650 S⊕ (~187,906 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1016.600 LY (311.705 pc) |