TOI-5344 b
Astrophysical Synthesis & Habitability Characterization
TOI-5344 b is a confirmed gas giant exoplanet orbiting the star TOI-5344, located approximately 451.3 light-years (138.37 parsecs) from the Solar System. First announced in 2023 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 2.7335% across the stellar disk), this world measures 10.604 Earth radii (0.95 Jupiter radii) and has a measured mass of 130.945 Earth masses (0.41 Jupiter masses). Combining its mass and radius yields a mean bulk density of 0.61 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 1.16 g⊕ (11.38 m/s²), and an escape velocity of 39.3 km/s.
In its orbital architecture around TOI-5344, TOI-5344 b completes one full revolution every 3.793 Earth days at a semi-major axis of 0.04041 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 115.9 km/s (compared to Earth's 29.8 km/s). Its moderate orbital eccentricity of e = 0.054 carries the world between 0.0382 AU at periapsis and 0.0426 AU at apoapsis, driving measurable seasonal insolation cycles.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 689 K (+416°C / +781°F) and receiving 38.00 S⊕ (~51,718 W/m²), TOI-5344 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-5344 is classified as a stellar host with an effective photospheric temperature of 3,747 K, a radius of 0.588 R☉, a mass of 0.612 M☉, an estimated bolometric luminosity of 0.061 L☉. Stellar evolution modeling indicates an estimated stellar age of 10.9 Gyr and a metallicity of [Fe/H] = 0.425 dex (metal-rich relative to the Sun). From Earth, TOI-5344 shines at apparent V-band magnitude 15.402 (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-5344 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 3,747 K |
| Stellar Radius | 0.5880 R☉ |
| Stellar Mass | 0.6120 M☉ |
| Bolometric Luminosity | 0.061 L☉ |
| Metallicity [Fe/H] | 0.425 dex |
| Stellar Age | 10.900 Gyr |
| Apparent Magnitude | V: 15.402 · G: 14.336 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040410 AU |
| Orbital Period | 3.793 days |
| Mean Orbital Velocity | 115.9 km/s |
| Orbital Eccentricity (e) | 0.05400 |
| Orbital Inclination (i) | 87.1500° |
| Mean Bulk Density | 0.61 g/cm³ (39.3 km/s vesc) |
| Insolation Flux | 38.0000 S⊕ (~51,718 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 451.300 LY (138.367 pc) |