HATS-32 b
Astrophysical Synthesis & Habitability Characterization
HATS-32 b is a confirmed gas giant exoplanet orbiting the star HATS-32, located approximately 2430.2 light-years (745.12 parsecs) from the Solar System. First announced in 2016 by HATSouth using the Transit detection technique (producing an estimated primary transit depth of 1.3689% across the stellar disk), this world measures 14 Earth radii (1.25 Jupiter radii) and has a measured mass of 292.404 Earth masses (0.92 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.59 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.49 g⊕ (14.61 m/s²), and an escape velocity of 51.1 km/s.
In its orbital architecture around HATS-32, HATS-32 b completes one full revolution every 2.813 Earth days at a semi-major axis of 0.04024 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 155.6 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.471, swinging from 0.0213 AU at periapsis out to 0.0592 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 1437 K (+1164°C / +2127°F) and receiving 614.59 S⊕ (~836,462 W/m²), HATS-32 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star HATS-32 is classified as a stellar host with an effective photospheric temperature of 5,700 K, a radius of 1.097 R☉, a mass of 1.099 M☉, an estimated bolometric luminosity of 1.14 L☉. Stellar evolution modeling indicates an estimated stellar age of 3.5 Gyr and a metallicity of [Fe/H] = 0.39 dex (metal-rich relative to the Sun). From Earth, HATS-32 shines at apparent V-band magnitude 14.386 (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-32 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 5,700 K |
| Stellar Radius | 1.0970 R☉ |
| Stellar Mass | 1.0990 M☉ |
| Bolometric Luminosity | 1.14 L☉ |
| Metallicity [Fe/H] | 0.390 dex |
| Stellar Age | 3.500 Gyr |
| Apparent Magnitude | V: 14.386 · G: 14.217 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040240 AU |
| Orbital Period | 2.813 days |
| Mean Orbital Velocity | 155.6 km/s |
| Orbital Eccentricity (e) | 0.47100 |
| Orbital Inclination (i) | 87.1000° |
| Mean Bulk Density | 0.59 g/cm³ (51.1 km/s vesc) |
| Insolation Flux | 614.5934 S⊕ (~836,462 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 2430.200 LY (745.116 pc) |