TOI-4127 b
Astrophysical Synthesis & Habitability Characterization
TOI-4127 b is a confirmed gas giant exoplanet orbiting the star TOI-4127, located approximately 1042.5 light-years (319.63 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.7324% across the stellar disk), this world measures 12.07 Earth radii (1.08 Jupiter radii) and has a measured mass of 743.718 Earth masses (2.34 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.33 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.1 g⊕ (50.01 m/s²), and an escape velocity of 87.8 km/s.
In its orbital architecture around TOI-4127, TOI-4127 b completes one full revolution every 56.399 Earth days at a semi-major axis of 0.303 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 58.4 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.7484, swinging from 0.0762 AU at periapsis out to 0.5298 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 556 K (+283°C / +541°F) and receiving 22.30 S⊕ (~30,350 W/m²), TOI-4127 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4127 is classified as a warm F-type star of spectral type F V with an effective photospheric temperature of 6,096 K, a radius of 1.293 R☉, a mass of 1.23 M☉, an estimated bolometric luminosity of 2.071 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.8 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, TOI-4127 shines at apparent V-band magnitude 11.441 (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-4127 |
| Spectral Type | F V |
| Effective Temp (Teff) | 6,096 K |
| Stellar Radius | 1.2930 R☉ |
| Stellar Mass | 1.2300 M☉ |
| Bolometric Luminosity | 2.071 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | 4.800 Gyr |
| Apparent Magnitude | V: 11.441 · G: 11.412 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.303000 AU |
| Orbital Period | 56.399 days |
| Mean Orbital Velocity | 58.4 km/s |
| Orbital Eccentricity (e) | 0.74840 |
| Orbital Inclination (i) | 89.3900° |
| Mean Bulk Density | 2.33 g/cm³ (87.8 km/s vesc) |
| Insolation Flux | 22.3000 S⊕ (~30,350 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1042.500 LY (319.632 pc) |