TOI-5734 b
Astrophysical Synthesis & Habitability Characterization
TOI-5734 b is a confirmed sub-neptune exoplanet orbiting the star TOI-5734, located approximately 106 light-years (32.51 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 0.0908% across the stellar disk), this world measures 2.1 Earth radii and has a measured mass of 9.1 Earth masses. Combining its mass and radius yields a mean bulk density of 5.42 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 2.06 g⊕ (20.2 m/s²), and an escape velocity of 23.3 km/s.
In its orbital architecture around TOI-5734, TOI-5734 b completes one full revolution every 6.184 Earth days at a semi-major axis of 0.05921 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 104.2 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 688 K (+415°C / +779°F) and receiving 56.38 S⊕ (~76,730 W/m²), TOI-5734 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5734 is classified as an orange K-type star of spectral type K3-K4 V with an effective photospheric temperature of 4,750 K, a radius of 0.639 R☉, a mass of 0.724 M☉, an estimated bolometric luminosity of 0.186 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.5 Gyr and a metallicity of [Fe/H] = -0.13 dex (metal-poor relative to the Sun). From Earth, TOI-5734 shines at apparent V-band magnitude 9.613 (accessible to binoculars and small amateur telescopes) 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-5734 |
| Spectral Type | K3-K4 V |
| Effective Temp (Teff) | 4,750 K |
| Stellar Radius | 0.6390 R☉ |
| Stellar Mass | 0.7240 M☉ |
| Bolometric Luminosity | 0.186 L☉ |
| Metallicity [Fe/H] | -0.130 dex |
| Stellar Age | 0.500 Gyr |
| Apparent Magnitude | V: 9.613 · G: 9.190 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.059210 AU |
| Orbital Period | 6.184 days |
| Mean Orbital Velocity | 104.2 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.8800° |
| Mean Bulk Density | 5.42 g/cm³ (23.3 km/s vesc) |
| Insolation Flux | 56.3778 S⊕ (~76,730 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 106.000 LY (32.510 pc) |