TOI-4034 b
Astrophysical Synthesis & Habitability Characterization
TOI-4034 b is a confirmed gas giant exoplanet orbiting the star TOI-4034, located approximately 2430.3 light-years (745.15 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 0.7872% across the stellar disk), this world measures 17.71 Earth radii (1.58 Jupiter radii) and has a measured mass of 276.511 Earth masses (0.87 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.27 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.88 g⊕ (8.63 m/s²), and an escape velocity of 44.2 km/s.
In its orbital architecture around TOI-4034, TOI-4034 b completes one full revolution every 1.802 Earth days at a semi-major axis of 0.03289 AU (an ultra-close orbit less than one-seventh of Mercury's 0.387 AU distance from the Sun, where strong stellar tidal forces typically induce synchronous rotation). Its mean orbital velocity is approximately 198.6 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 1907 K (+1634°C / +2973°F) and receiving 1,870.78 S⊕ (~2,546,132 W/m²), TOI-4034 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4034 is classified as a stellar host with an effective photospheric temperature of 5,891 K, a radius of 1.83 R☉, a mass of 1.19 M☉, an estimated bolometric luminosity of 3.619 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.7 Gyr and a metallicity of [Fe/H] = 0.12 dex (metal-rich relative to the Sun). From Earth, TOI-4034 shines at apparent V-band magnitude 13.262 (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-4034 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,891 K |
| Stellar Radius | 1.8300 R☉ |
| Stellar Mass | 1.1900 M☉ |
| Bolometric Luminosity | 3.619 L☉ |
| Metallicity [Fe/H] | 0.120 dex |
| Stellar Age | 5.700 Gyr |
| Apparent Magnitude | V: 13.262 · G: 13.108 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.032890 AU |
| Orbital Period | 1.802 days |
| Mean Orbital Velocity | 198.6 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 80.7600° |
| Mean Bulk Density | 0.27 g/cm³ (44.2 km/s vesc) |
| Insolation Flux | 1870.7800 S⊕ (~2,546,132 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2430.300 LY (745.145 pc) |