TOI-1634 b
Astrophysical Synthesis & Habitability Characterization
TOI-1634 b is a confirmed super-earth exoplanet orbiting the star TOI-1634, located approximately 115 light-years (35.27 parsecs) from the Solar System. First announced in 2021 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.1284% across the stellar disk), this world measures 1.759 Earth radii and has a measured mass of 4.9 Earth masses. Combining its mass and radius yields a mean bulk density of 4.96 g/cm³ (a terrestrial silicate-iron composition comparable to Earth (5.51 g/cm³)), a surface gravity of 1.58 g⊕ (15.49 m/s²), and an escape velocity of 18.7 km/s.
In its orbital architecture around TOI-1634, TOI-1634 b completes one full revolution every 0.989 Earth days at a semi-major axis of 0.01544 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 169.8 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 900 K (+627°C / +1161°F) and receiving 121.00 S⊕ (~164,681 W/m²), TOI-1634 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star TOI-1634 is classified as a low-mass red dwarf of spectral type M2 with an effective photospheric temperature of 3,550 K, a radius of 0.45 R☉, a mass of 0.502 M☉, an estimated bolometric luminosity of 0.029 L☉. Stellar evolution modeling indicates a metallicity of [Fe/H] = 0.23 dex (metal-rich relative to the Sun). From Earth, TOI-1634 shines at apparent V-band magnitude 13.217 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-1634 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-1634 b sharing its stellar neighborhood alongside TOI-1634 c.
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-1634 |
| Spectral Type | M2 |
| Effective Temp (Teff) | 3,550 K |
| Stellar Radius | 0.4500 R☉ |
| Stellar Mass | 0.5020 M☉ |
| Bolometric Luminosity | 0.029 L☉ |
| Metallicity [Fe/H] | 0.230 dex |
| Stellar Age | — |
| Apparent Magnitude | V: 13.217 · G: 12.197 |
| System Architecture | 2 Stars, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.015440 AU |
| Orbital Period | 0.989 days |
| Mean Orbital Velocity | 169.8 km/s |
| Orbital Eccentricity (e) | 0.00000 |
| Orbital Inclination (i) | 86.6600° |
| Mean Bulk Density | 4.96 g/cm³ (18.7 km/s vesc) |
| Insolation Flux | 121.0000 S⊕ (~164,681 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 115.000 LY (35.274 pc) |