TOI-1743 b
Astrophysical Synthesis & Habitability Characterization
TOI-1743 b is a confirmed super-earth exoplanet orbiting the star TOI-1743, located approximately 134.6 light-years (41.28 parsecs) from the Solar System. First announced in 2025 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.2464% across the stellar disk), this world measures 1.83 Earth radii and has a measured mass of 4.01 Earth masses. Combining its mass and radius yields a mean bulk density of 3.61 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.2 g⊕ (11.77 m/s²), and an escape velocity of 16.6 km/s.
In its orbital architecture around TOI-1743, TOI-1743 b completes one full revolution every 4.266 Earth days at a semi-major axis of 0.03589 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 91.5 km/s (compared to Earth's 29.8 km/s).
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 485 K (+212°C / +414°F) and receiving 10.88 S⊕ (~14,813 W/m²), TOI-1743 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1743 is classified as a low-mass red dwarf of spectral type M4 V with an effective photospheric temperature of 3,277 K, a radius of 0.338 R☉, a mass of 0.339 M☉, an estimated bolometric luminosity of 0.012 L☉. Stellar evolution modeling indicates an estimated stellar age of 9.7 Gyr and a metallicity of [Fe/H] = 0.22 dex (metal-rich relative to the Sun). From Earth, TOI-1743 shines at apparent V-band magnitude 14.972 (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-1743 |
| Spectral Type | M4 V |
| Effective Temp (Teff) | 3,277 K |
| Stellar Radius | 0.3380 R☉ |
| Stellar Mass | 0.3390 M☉ |
| Bolometric Luminosity | 0.012 L☉ |
| Metallicity [Fe/H] | 0.220 dex |
| Stellar Age | 9.700 Gyr |
| Apparent Magnitude | V: 14.972 · G: 13.729 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.035890 AU |
| Orbital Period | 4.266 days |
| Mean Orbital Velocity | 91.5 km/s |
| Orbital Eccentricity (e) | Circular (0.00) |
| Orbital Inclination (i) | 87.9200° |
| Mean Bulk Density | 3.61 g/cm³ (16.6 km/s vesc) |
| Insolation Flux | 10.8837 S⊕ (~14,813 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 134.600 LY (41.276 pc) |