TWA 7 b
Astrophysical Synthesis & Habitability Characterization
TWA 7 b is a confirmed gas giant exoplanet orbiting the star TWA 7, located approximately 110.9 light-years (34 parsecs) from the Solar System. First announced in 2025 by James Webb Space Telescope (JWST) using the Imaging detection technique (resolved directly via high-contrast coronagraphic or interferometric imaging), this world measures 12.7 Earth radii (1.13 Jupiter radii) and has a measured mass of 108.062 Earth masses (0.34 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.29 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 0.67 g⊕ (6.57 m/s²), and an escape velocity of 32.6 km/s.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 12.700 R⊕, TWA 7 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star TWA 7 is classified as a stellar host with an effective photospheric temperature of 3,509 K, a radius of 0.9172 R☉, a mass of 0.46 M☉, an estimated bolometric luminosity of 0.114 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.006 Gyr. From Earth, TWA 7 shines at apparent V-band magnitude 11.773 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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: James Webb Space Telescope (JWST) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TWA 7 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,509 K |
| Stellar Radius | 0.9172 R☉ |
| Stellar Mass | 0.4600 M☉ |
| Bolometric Luminosity | 0.114 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | 0.006 Gyr |
| Apparent Magnitude | V: 11.773 · G: 10.619 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 52.000000 AU |
| Orbital Period | — |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 0.29 g/cm³ (32.6 km/s vesc) |
| Insolation Flux | 0.0000 S⊕ |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 110.900 LY (33.996 pc) |