TOI-1723 b
Astrophysical Synthesis & Habitability Characterization
TOI-1723 b is a confirmed sub-neptune exoplanet orbiting the star TOI-1723, located approximately 328.5 light-years (100.73 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0835% across the stellar disk), this world measures 3.435 Earth radii (0.31 Jupiter radii) and has a measured mass of 10.4 Earth masses. Combining its mass and radius yields a mean bulk density of 1.41 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.88 g⊕ (8.63 m/s²), and an escape velocity of 19.5 km/s.
In its orbital architecture around TOI-1723, TOI-1723 b completes one full revolution every 13.727 Earth days at a semi-major axis of 0.113496 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 89.9 km/s (compared to Earth's 29.8 km/s). The orbit is modeled as circular (e = 0.00), maintaining a constant stellar distance throughout its year.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 783 K (+510°C / +950°F) and receiving 92.36 S⊕ (~125,702 W/m²), TOI-1723 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1723 is classified as a stellar host with an effective photospheric temperature of 5,777 K, a radius of 1.09 R☉, a mass of 1.04 M☉, an estimated bolometric luminosity of 1.187 L☉. Stellar evolution modeling indicates an estimated stellar age of 4.8 Gyr and a metallicity of [Fe/H] = 0.159 dex (metal-rich relative to the Sun). From Earth, TOI-1723 shines at apparent V-band magnitude 9.664 (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-1723 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,777 K |
| Stellar Radius | 1.0900 R☉ |
| Stellar Mass | 1.0400 M☉ |
| Bolometric Luminosity | 1.187 L☉ |
| Metallicity [Fe/H] | 0.159 dex |
| Stellar Age | 4.800 Gyr |
| Apparent Magnitude | V: 9.664 · G: 9.536 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.113496 AU |
| Orbital Period | 13.727 days |
| Mean Orbital Velocity | 89.9 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 1.41 g/cm³ (19.5 km/s vesc) |
| Insolation Flux | 92.3600 S⊕ (~125,702 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 328.500 LY (100.727 pc) |