TOI-7393 b
Astrophysical Synthesis & Habitability Characterization
TOI-7393 b is a confirmed gas giant exoplanet orbiting the star TOI-7393, located approximately 616.6 light-years (189.04 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 3.1685% across the stellar disk), this world measures 11.3 Earth radii (1.01 Jupiter radii) and has a measured mass of 194.78 Earth masses (0.61 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.74 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.53 g⊕ (15 m/s²), and an escape velocity of 46.4 km/s.
In its orbital architecture around TOI-7393, TOI-7393 b completes one full revolution every 3.337 Earth days at a semi-major axis of 0.03664 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 119.4 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.1198 carries the world between 0.0323 AU at periapsis and 0.041 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 747 K (+474°C / +885°F) and receiving 51.80 S⊕ (~70,500 W/m²), TOI-7393 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7393 is classified as a low-mass red dwarf of spectral type M0 V with an effective photospheric temperature of 3,927 K, a radius of 0.582 R☉, a mass of 0.6 M☉, an estimated bolometric luminosity of 0.072 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = -0.35 dex (metal-poor relative to the Sun). From Earth, TOI-7393 shines at apparent V-band magnitude 14.834 (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-7393 |
| Spectral Type | M0 V |
| Effective Temp (Teff) | 3,927 K |
| Stellar Radius | 0.5820 R☉ |
| Stellar Mass | 0.6000 M☉ |
| Bolometric Luminosity | 0.072 L☉ |
| Metallicity [Fe/H] | -0.350 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.834 · G: 14.301 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.036640 AU |
| Orbital Period | 3.337 days |
| Mean Orbital Velocity | 119.4 km/s |
| Orbital Eccentricity (e) | 0.11980 |
| Orbital Inclination (i) | 86.4300° |
| Mean Bulk Density | 0.74 g/cm³ (46.4 km/s vesc) |
| Insolation Flux | 51.8000 S⊕ (~70,500 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 616.600 LY (189.038 pc) |