TOI-5634 A b
Astrophysical Synthesis & Habitability Characterization
TOI-5634 A b is a confirmed gas giant exoplanet orbiting the star TOI-5634 A, located approximately 998.5 light-years (306.14 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 3.1296% across the stellar disk), this world measures 10.42 Earth radii (0.93 Jupiter radii) and has a measured mass of 588 Earth masses (1.85 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.87 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.42 g⊕ (53.15 m/s²), and an escape velocity of 84 km/s.
In its orbital architecture around TOI-5634 A, TOI-5634 A b completes one full revolution every 2.204 Earth days at a semi-major axis of 0.0272 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 134.3 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 837 K (+564°C / +1047°F) and receiving 77.00 S⊕ (~104,797 W/m²), TOI-5634 A b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5634 A is classified as a stellar host with an effective photospheric temperature of 3,896 K, a radius of 0.54 R☉, a mass of 0.556 M☉, an estimated bolometric luminosity of 0.06 L☉. Stellar evolution modeling indicates an estimated stellar age of 7.4 Gyr and a metallicity of [Fe/H] = -0.27 dex (metal-poor relative to the Sun). From Earth, TOI-5634 A shines at apparent V-band magnitude 16.854 (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-5634 A |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,896 K |
| Stellar Radius | 0.5400 R☉ |
| Stellar Mass | 0.5560 M☉ |
| Bolometric Luminosity | 0.06 L☉ |
| Metallicity [Fe/H] | -0.270 dex |
| Stellar Age | 7.400 Gyr |
| Apparent Magnitude | V: 16.854 · G: 15.998 |
| System Architecture | 2 Stars, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.027200 AU |
| Orbital Period | 2.204 days |
| Mean Orbital Velocity | 134.3 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 88.1900° |
| Mean Bulk Density | 2.87 g/cm³ (84 km/s vesc) |
| Insolation Flux | 77.0000 S⊕ (~104,797 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 998.500 LY (306.144 pc) |