TOI-3693 b
Astrophysical Synthesis & Habitability Characterization
TOI-3693 b is a confirmed gas giant exoplanet orbiting the star TOI-3693, located approximately 575.5 light-years (176.44 parsecs) from the Solar System. First announced in 2022 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 2.1324% across the stellar disk), this world measures 12.599 Earth radii (1.12 Jupiter radii) and has a measured mass of 324.185 Earth masses (1.02 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.89 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 2.04 g⊕ (20.01 m/s²), and an escape velocity of 56.7 km/s.
In its orbital architecture around TOI-3693, TOI-3693 b completes one full revolution every 9.089 Earth days at a semi-major axis of 0.0813 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 97.3 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 801 K (+528°C / +982°F) and receiving 68.60 S⊕ (~93,365 W/m²), TOI-3693 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-3693 is classified as a stellar host with an effective photospheric temperature of 5,321 K, a radius of 0.791 R☉, a mass of 0.867 M☉, an estimated bolometric luminosity of 0.45 L☉. Stellar evolution modeling indicates an estimated stellar age of 3 Gyr and a metallicity of [Fe/H] = 0.071 dex (metal-rich relative to the Sun). From Earth, TOI-3693 shines at apparent V-band magnitude 11.948 (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-3693 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,321 K |
| Stellar Radius | 0.7910 R☉ |
| Stellar Mass | 0.8670 M☉ |
| Bolometric Luminosity | 0.45 L☉ |
| Metallicity [Fe/H] | 0.071 dex |
| Stellar Age | 3.000 Gyr |
| Apparent Magnitude | V: 11.948 · G: 11.958 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.081300 AU |
| Orbital Period | 9.089 days |
| Mean Orbital Velocity | 97.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.5700° |
| Mean Bulk Density | 0.89 g/cm³ (56.7 km/s vesc) |
| Insolation Flux | 68.6000 S⊕ (~93,365 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 575.500 LY (176.436 pc) |