TOI-7265 B b
Astrophysical Synthesis & Habitability Characterization
TOI-7265 B b is a confirmed gas giant exoplanet orbiting the star TOI-7265 B, located approximately 469.6 light-years (143.97 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 3.8958% across the stellar disk), this world measures 10.7 Earth radii (0.95 Jupiter radii) and has a measured mass of 224.95 Earth masses (0.71 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.01 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.96 g⊕ (19.22 m/s²), and an escape velocity of 51.3 km/s.
In its orbital architecture around TOI-7265 B, TOI-7265 B b completes one full revolution every 4.172 Earth days at a semi-major axis of 0.04007 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 104.5 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.0372 (ranging from 0.0386 AU at periapsis to 0.0416 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 571 K (+298°C / +568°F) and receiving 17.70 S⊕ (~24,090 W/m²), TOI-7265 B b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-7265 B is classified as a low-mass red dwarf of spectral type M2 V with an effective photospheric temperature of 3,503 K, a radius of 0.497 R☉, a mass of 0.521 M☉, an estimated bolometric luminosity of 0.033 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.35 dex (metal-rich relative to the Sun). From Earth, TOI-7265 B shines at apparent V-band magnitude 14.265 (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-7265 B |
| Spectral Type | M2 V |
| Effective Temp (Teff) | 3,503 K |
| Stellar Radius | 0.4970 R☉ |
| Stellar Mass | 0.5210 M☉ |
| Bolometric Luminosity | 0.033 L☉ |
| Metallicity [Fe/H] | 0.350 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 14.265 · G: 15.253 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040070 AU |
| Orbital Period | 4.172 days |
| Mean Orbital Velocity | 104.5 km/s |
| Orbital Eccentricity (e) | 0.03720 |
| Orbital Inclination (i) | 88.8900° |
| Mean Bulk Density | 1.01 g/cm³ (51.3 km/s vesc) |
| Insolation Flux | 17.7000 S⊕ (~24,090 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 469.600 LY (143.970 pc) |