TOI-4029 b
Astrophysical Synthesis & Habitability Characterization
TOI-4029 b is a confirmed gas giant exoplanet orbiting the star TOI-4029, located approximately 895.1 light-years (274.44 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.2748% across the stellar disk), this world measures 6.738 Earth radii (0.6 Jupiter radii) and has a measured mass of 36.6 Earth masses (0.12 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.66 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.81 g⊕ (7.94 m/s²), and an escape velocity of 26.1 km/s.
In its orbital architecture around TOI-4029, TOI-4029 b completes one full revolution every 5.885 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1142 K (+869°C / +1596°F) and receiving 282.51 S⊕ (~384,495 W/m²), TOI-4029 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4029 is classified as a stellar host with an effective photospheric temperature of 5,663 K, a radius of 1.1783 R☉, a mass of 1.018 M☉, an estimated bolometric luminosity of 1.281 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.101 dex (metal-rich relative to the Sun). From Earth, TOI-4029 shines at apparent V-band magnitude 11.554 (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-4029 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,663 K |
| Stellar Radius | 1.1783 R☉ |
| Stellar Mass | 1.0180 M☉ |
| Bolometric Luminosity | 1.281 L☉ |
| Metallicity [Fe/H] | 0.101 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.554 · G: 11.616 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 5.885 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.2039° |
| Mean Bulk Density | 0.66 g/cm³ (26.1 km/s vesc) |
| Insolation Flux | 282.5090 S⊕ (~384,495 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 895.100 LY (274.436 pc) |