TOI-4329 b
Astrophysical Synthesis & Habitability Characterization
TOI-4329 b is a confirmed gas giant exoplanet orbiting the star TOI-4329, located approximately 2339 light-years (717.13 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 0.4453% across the stellar disk), this world measures 16.813 Earth radii (1.5 Jupiter radii) and has a measured mass of 143.023 Earth masses (0.45 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.17 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.51 g⊕ (5 m/s²), and an escape velocity of 32.6 km/s.
In its orbital architecture around TOI-4329, TOI-4329 b completes one full revolution every 2.922 Earth days. Its moderate orbital eccentricity of e = 0.068 driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 2027 K (+1754°C / +3189°F) and receiving 3,990.57 S⊕ (~5,431,168 W/m²), TOI-4329 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4329 is classified as a stellar host with an effective photospheric temperature of 6,000 K, a radius of 2.31 R☉, a mass of 1.538 M☉, an estimated bolometric luminosity of 6.205 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.39 Gyr and a metallicity of [Fe/H] = 0.29 dex (metal-rich relative to the Sun). From Earth, TOI-4329 shines at apparent V-band magnitude 12.724 (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-4329 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 6,000 K |
| Stellar Radius | 2.3100 R☉ |
| Stellar Mass | 1.5380 M☉ |
| Bolometric Luminosity | 6.205 L☉ |
| Metallicity [Fe/H] | 0.290 dex |
| Stellar Age | 2.390 Gyr |
| Apparent Magnitude | V: 12.724 · G: 12.475 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 2.922 days |
| Orbital Eccentricity (e) | 0.06800 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.17 g/cm³ (32.6 km/s vesc) |
| Insolation Flux | 3990.5716 S⊕ (~5,431,168 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2339.000 LY (717.128 pc) |