TOI-5027 b
Astrophysical Synthesis & Habitability Characterization
TOI-5027 b is a confirmed gas giant exoplanet orbiting the star TOI-5027, located approximately 666.8 light-years (204.43 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.1499% across the stellar disk), this world measures 10.761 Earth radii (0.96 Jupiter radii) and has a measured mass of 642.013 Earth masses (2.02 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.84 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 5.54 g⊕ (54.33 m/s²), and an escape velocity of 86.4 km/s.
In its orbital architecture around TOI-5027, TOI-5027 b completes one full revolution every 10.244 Earth days at a semi-major axis of 0.093 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 98.8 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.385, swinging from 0.0572 AU at periapsis out to 0.1288 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1056 K (+783°C / +1441°F) and receiving 190.91 S⊕ (~259,831 W/m²), TOI-5027 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5027 is classified as a stellar host with an effective photospheric temperature of 5,909 K, a radius of 0.92 R☉, a mass of 1.02 M☉, an estimated bolometric luminosity of 0.926 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.4 Gyr and a metallicity of [Fe/H] = -0.15 dex (metal-poor relative to the Sun). From Earth, TOI-5027 shines at apparent V-band magnitude 11.566 (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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-5027 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,909 K |
| Stellar Radius | 0.9200 R☉ |
| Stellar Mass | 1.0200 M☉ |
| Bolometric Luminosity | 0.926 L☉ |
| Metallicity [Fe/H] | -0.150 dex |
| Stellar Age | 0.400 Gyr |
| Apparent Magnitude | V: 11.566 · G: 11.334 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.093000 AU |
| Orbital Period | 10.244 days |
| Mean Orbital Velocity | 98.8 km/s |
| Orbital Eccentricity (e) | 0.38500 |
| Orbital Inclination (i) | 88.1800° |
| Mean Bulk Density | 2.84 g/cm³ (86.4 km/s vesc) |
| Insolation Flux | 190.9120 S⊕ (~259,831 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 666.800 LY (204.429 pc) |