HATS-36 b
Astrophysical Synthesis & Habitability Characterization
HATS-36 b is a confirmed gas giant exoplanet orbiting the star HATS-36, located approximately 2793.3 light-years (856.44 parsecs) from the Solar System. First announced in 2018 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.1595% across the stellar disk), this world measures 12.92 Earth radii (1.15 Jupiter radii) and has a measured mass of 1022.141 Earth masses (3.22 Jupiter masses). Combining its mass and radius yields a mean bulk density of 2.61 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 6.12 g⊕ (60.02 m/s²), and an escape velocity of 99.5 km/s.
In its orbital architecture around HATS-36, HATS-36 b completes one full revolution every 4.175 Earth days at a semi-major axis of 0.0523 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 136.3 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.105 carries the world between 0.0468 AU at periapsis and 0.0578 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1203 K (+930°C / +1706°F) and receiving 561.00 S⊕ (~763,521 W/m²), HATS-36 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-36 is classified as a solar-type yellow star of spectral type G0 V with an effective photospheric temperature of 5,950 K, a radius of 1.1 R☉, a mass of 1.1 M☉, an estimated bolometric luminosity of 1.361 L☉. Stellar evolution modeling indicates an estimated stellar age of 0.62 Gyr and a metallicity of [Fe/H] = 0.15 dex (metal-rich relative to the Sun). From Earth, HATS-36 shines at apparent V-band magnitude 14.364 (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: HATSouth · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | HATS-36 |
| Spectral Type | G0 V |
| Effective Temp (Teff) | 5,950 K |
| Stellar Radius | 1.1000 R☉ |
| Stellar Mass | 1.1000 M☉ |
| Bolometric Luminosity | 1.361 L☉ |
| Metallicity [Fe/H] | 0.150 dex |
| Stellar Age | 0.620 Gyr |
| Apparent Magnitude | V: 14.364 · G: 14.233 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.052300 AU |
| Orbital Period | 4.175 days |
| Mean Orbital Velocity | 136.3 km/s |
| Orbital Eccentricity (e) | 0.10500 |
| Orbital Inclination (i) | 87.6100° |
| Mean Bulk Density | 2.61 g/cm³ (99.5 km/s vesc) |
| Insolation Flux | 561.0000 S⊕ (~763,521 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2793.300 LY (856.436 pc) |