TOI-375 b
Astrophysical Synthesis & Habitability Characterization
TOI-375 b is a confirmed gas giant exoplanet orbiting the star TOI-375, located approximately 1292.3 light-years (396.21 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 0.116% across the stellar disk), this world measures 10.772 Earth radii (0.96 Jupiter radii) and has a measured mass of 236.782 Earth masses (0.74 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.04 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 52.4 km/s.
In its orbital architecture around TOI-375, TOI-375 b completes one full revolution every 9.455 Earth days at a semi-major axis of 0.099 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 113.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.087 carries the world between 0.0904 AU at periapsis and 0.1076 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1373 K (+1100°C / +2012°F) and receiving 593.30 S⊕ (~807,481 W/m²), TOI-375 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-375 is classified as a stellar host with an effective photospheric temperature of 5,260 K, a radius of 2.9 R☉, a mass of 1.441 M☉, an estimated bolometric luminosity of 5.776 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.94 Gyr and a metallicity of [Fe/H] = 0.084 dex (metal-rich relative to the Sun). From Earth, TOI-375 shines at apparent V-band magnitude 11.516 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-375 system is a multi-planet architecture hosting 3 confirmed worlds, with TOI-375 b sharing its stellar neighborhood alongside TOI-375 c, TOI-375 d.
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-375 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,260 K |
| Stellar Radius | 2.9000 R☉ |
| Stellar Mass | 1.4410 M☉ |
| Bolometric Luminosity | 5.776 L☉ |
| Metallicity [Fe/H] | 0.084 dex |
| Stellar Age | 2.940 Gyr |
| Apparent Magnitude | V: 11.516 · G: 11.047 |
| System Architecture | 1 Star, 3 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.099000 AU |
| Orbital Period | 9.455 days |
| Mean Orbital Velocity | 113.9 km/s |
| Orbital Eccentricity (e) | 0.08700 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.04 g/cm³ (52.4 km/s vesc) |
| Insolation Flux | 593.3000 S⊕ (~807,481 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 1292.300 LY (396.213 pc) |