TOI-2084 b
Astrophysical Synthesis & Habitability Characterization
TOI-2084 b is a confirmed sub-neptune exoplanet orbiting the star TOI-2084, located approximately 373.6 light-years (114.55 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 0.2273% across the stellar disk), this world measures 2.47 Earth radii and has a measured mass of 6.66 Earth masses. Combining its mass and radius yields a mean bulk density of 2.44 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.09 g⊕ (10.69 m/s²), and an escape velocity of 18.4 km/s.
In its orbital architecture around TOI-2084, TOI-2084 b completes one full revolution every 6.078 Earth days at a semi-major axis of 0.05006 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 89.6 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 527 K (+254°C / +489°F) and receiving 12.80 S⊕ (~17,421 W/m²), TOI-2084 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-2084 is classified as a low-mass red dwarf of spectral type M2+/-0.5 with an effective photospheric temperature of 3,551 K, a radius of 0.475 R☉, a mass of 0.453 M☉, an estimated bolometric luminosity of 0.032 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.5 Gyr and a metallicity of [Fe/H] = -0.13 dex (metal-poor relative to the Sun). From Earth, TOI-2084 shines at apparent V-band magnitude 15.115 (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-2084 |
| Spectral Type | M2+/-0.5 |
| Effective Temp (Teff) | 3,551 K |
| Stellar Radius | 0.4750 R☉ |
| Stellar Mass | 0.4530 M☉ |
| Bolometric Luminosity | 0.032 L☉ |
| Metallicity [Fe/H] | -0.130 dex |
| Stellar Age | 7.500 Gyr |
| Apparent Magnitude | V: 15.115 · G: 14.410 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.050060 AU |
| Orbital Period | 6.078 days |
| Mean Orbital Velocity | 89.6 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 89.1500° |
| Mean Bulk Density | 2.44 g/cm³ (18.4 km/s vesc) |
| Insolation Flux | 12.8000 S⊕ (~17,421 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 373.600 LY (114.549 pc) |