TOI-4336 A c
Astrophysical Synthesis & Habitability Characterization
TOI-4336 A c is a confirmed super-earth exoplanet orbiting the star TOI-4336 A, located approximately 73.5 light-years (22.55 parsecs) from the Solar System. First announced in 2026 by Multiple Observatories using the Transit detection technique (producing an estimated primary transit depth of 0.1238% across the stellar disk), this world measures 1.251 Earth radii and has a measured mass of 1.55 Earth masses. Combining its mass and radius yields a mean bulk density of 4.37 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 0.99 g⊕ (9.71 m/s²), and an escape velocity of 12.5 km/s.
In its orbital architecture around TOI-4336 A, TOI-4336 A c completes one full revolution every 7.587 Earth days at a semi-major axis of 0.05092 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 73 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 400 K (+127°C / +261°F) and receiving 4.24 S⊕ (~5,771 W/m²), TOI-4336 A c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-4336 A is classified as a low-mass red dwarf of spectral type M3.5 V with an effective photospheric temperature of 3,307 K, a radius of 0.326 R☉, a mass of 0.306 M☉, an estimated bolometric luminosity of 0.011 L☉. Stellar evolution modeling indicates an estimated stellar age of 6.7 Gyr and a metallicity of [Fe/H] = 0.14 dex (metal-rich relative to the Sun). From Earth, TOI-4336 A shines at apparent V-band magnitude 13.6 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-4336 A system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-4336 A c sharing its stellar neighborhood alongside TOI-4336 A b.
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: Multiple Observatories · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-4336 A |
| Spectral Type | M3.5 V |
| Effective Temp (Teff) | 3,307 K |
| Stellar Radius | 0.3260 R☉ |
| Stellar Mass | 0.3060 M☉ |
| Bolometric Luminosity | 0.011 L☉ |
| Metallicity [Fe/H] | 0.140 dex |
| Stellar Age | 6.700 Gyr |
| Apparent Magnitude | V: 13.600 · G: 12.257 |
| System Architecture | 3 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.050920 AU |
| Orbital Period | 7.587 days |
| Mean Orbital Velocity | 73 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 89.6400° |
| Mean Bulk Density | 4.37 g/cm³ (12.5 km/s vesc) |
| Insolation Flux | 4.2400 S⊕ (~5,771 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 73.500 LY (22.546 pc) |