TOI-713 c
Astrophysical Synthesis & Habitability Characterization
TOI-713 c is a confirmed sub-neptune exoplanet orbiting the star TOI-713, located approximately 226.2 light-years (69.37 parsecs) from the Solar System. First announced in 2026 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.0841% across the stellar disk), this world measures 2.06 Earth radii and has a measured mass of 6.521 Earth masses. Combining its mass and radius yields a mean bulk density of 4.11 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.54 g⊕ (15.1 m/s²), and an escape velocity of 19.9 km/s.
In its orbital architecture around TOI-713, TOI-713 c completes one full revolution every 35.999 Earth days. The planet follows a highly eccentric trajectory (e = 0.26), pointing to past dynamical scattering or secular gravitational perturbations.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 356 K (+83°C / +181°F) and receiving 3.84 S⊕ (~5,226 W/m²), TOI-713 c orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-713 is classified as a stellar host with an effective photospheric temperature of 4,317 K, a radius of 0.6511 R☉, a mass of 0.67 M☉, an estimated bolometric luminosity of 0.132 L☉. From Earth, TOI-713 shines at apparent V-band magnitude 11.863 (faint and requiring research-grade or CCD telescopic photometry) in the Southern celestial hemisphere. The TOI-713 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-713 c sharing its stellar neighborhood alongside TOI-713 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: Transiting Exoplanet Survey Satellite (TESS) · Catalogue Source: NASA Exoplanet Archive (IPAC / Caltech).
☀️ Host Star Telemetry
| Host Star Name | TOI-713 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,317 K |
| Stellar Radius | 0.6511 R☉ |
| Stellar Mass | 0.6700 M☉ |
| Bolometric Luminosity | 0.132 L☉ |
| Metallicity [Fe/H] | — |
| Stellar Age | — |
| Apparent Magnitude | V: 11.863 · G: 11.438 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | — |
| Orbital Period | 35.999 days |
| Orbital Eccentricity (e) | 0.26000 |
| Orbital Inclination (i) | — |
| Mean Bulk Density | 4.11 g/cm³ (19.9 km/s vesc) |
| Insolation Flux | 3.8400 S⊕ (~5,226 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 226.200 LY (69.365 pc) |