TOI-2000 b
Astrophysical Synthesis & Habitability Characterization
TOI-2000 b is a confirmed sub-neptune exoplanet orbiting the star TOI-2000, located approximately 573.1 light-years (175.71 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 0.0476% across the stellar disk), this world measures 2.7 Earth radii and has a measured mass of 11 Earth masses. Combining its mass and radius yields a mean bulk density of 3.08 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.51 g⊕ (14.81 m/s²), and an escape velocity of 22.6 km/s.
In its orbital architecture around TOI-2000, TOI-2000 b completes one full revolution every 3.098 Earth days at a semi-major axis of 0.04271 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 150 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 1488 K (+1215°C / +2219°F) and receiving 628.00 S⊕ (~854,708 W/m²), TOI-2000 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2000 is classified as a stellar host with an effective photospheric temperature of 5,611 K, a radius of 1.134 R☉, a mass of 1.082 M☉, an estimated bolometric luminosity of 1.144 L☉. Stellar evolution modeling indicates an estimated stellar age of 5.3 Gyr and a metallicity of [Fe/H] = 0.439 dex (metal-rich relative to the Sun). From Earth, TOI-2000 shines at apparent V-band magnitude 10.984 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-2000 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-2000 b sharing its stellar neighborhood alongside TOI-2000 c.
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-2000 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,611 K |
| Stellar Radius | 1.1340 R☉ |
| Stellar Mass | 1.0820 M☉ |
| Bolometric Luminosity | 1.144 L☉ |
| Metallicity [Fe/H] | 0.439 dex |
| Stellar Age | 5.300 Gyr |
| Apparent Magnitude | V: 10.984 · G: 10.854 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.042710 AU |
| Orbital Period | 3.098 days |
| Mean Orbital Velocity | 150 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 84.5900° |
| Mean Bulk Density | 3.08 g/cm³ (22.6 km/s vesc) |
| Insolation Flux | 628.0000 S⊕ (~854,708 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 573.100 LY (175.713 pc) |