TOI-5704 b
Astrophysical Synthesis & Habitability Characterization
TOI-5704 b is a confirmed sub-neptune exoplanet orbiting the star TOI-5704, located approximately 292.4 light-years (89.64 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 0.1525% across the stellar disk), this world measures 3.227 Earth radii (0.29 Jupiter radii) and has a measured mass of 10.5 Earth masses. Combining its mass and radius yields a mean bulk density of 1.72 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.01 g⊕ (9.9 m/s²), and an escape velocity of 20.2 km/s.
In its orbital architecture around TOI-5704, TOI-5704 b completes one full revolution every 3.771 Earth days.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 949 K (+676°C / +1249°F) and receiving 125.06 S⊕ (~170,213 W/m²), TOI-5704 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5704 is classified as a stellar host with an effective photospheric temperature of 4,590 K, a radius of 0.7575 R☉, a mass of 0.73 M☉, an estimated bolometric luminosity of 0.229 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.428 dex (metal-rich relative to the Sun). From Earth, TOI-5704 shines at apparent V-band magnitude 11.529 (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-5704 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,590 K |
| Stellar Radius | 0.7575 R☉ |
| Stellar Mass | 0.7300 M☉ |
| Bolometric Luminosity | 0.229 L☉ |
| Metallicity [Fe/H] | 0.428 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 11.529 · G: 11.275 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 3.771 days |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 88.9400° |
| Mean Bulk Density | 1.72 g/cm³ (20.2 km/s vesc) |
| Insolation Flux | 125.0643 S⊕ (~170,213 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 292.400 LY (89.637 pc) |