TOI-2537 b
Astrophysical Synthesis & Habitability Characterization
TOI-2537 b is a confirmed gas giant exoplanet orbiting the star TOI-2537, located approximately 603.3 light-years (184.99 parsecs) from the Solar System. First announced in 2024 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 1.7908% across the stellar disk), this world measures 11.254 Earth radii (1 Jupiter radii) and has a measured mass of 415.402 Earth masses (1.31 Jupiter masses). Combining its mass and radius yields a mean bulk density of 1.61 g/cm³ (a low bulk density dominated by an extended hydrogen-helium gaseous envelope), a surface gravity of 3.28 g⊕ (32.17 m/s²), and an escape velocity of 68 km/s.
In its orbital architecture around TOI-2537, TOI-2537 b completes one full revolution every 94.102 Earth days at a semi-major axis of 0.3715 AU (orbiting interior to Mercury's 0.387 AU benchmark in the Solar System). Its mean orbital velocity is approximately 42.9 km/s (compared to Earth's 29.8 km/s). The planet follows a highly eccentric trajectory (e = 0.364, swinging from 0.2363 AU at periapsis out to 0.5067 AU at apoapsis), pointing to past dynamical scattering or secular gravitational perturbations.
☁️ Atmospheric Regime (Volatile / Gas Envelope): With a radius of 11.254 R⊕, TOI-2537 b exceeds the empirical ~1.8–2.2 R⊕ Fulton radius valley threshold, indicating a substantial hydrogen-helium or supercritical volatile envelope without a conventional solid terrestrial surface.
The host star TOI-2537 is classified as a stellar host with an effective photospheric temperature of 4,870 K, a radius of 0.771 R☉, a mass of 0.771 M☉, an estimated bolometric luminosity of 0.3 L☉. Stellar evolution modeling indicates an estimated stellar age of 1.1 Gyr and a metallicity of [Fe/H] = 0.08 dex (metal-rich relative to the Sun). From Earth, TOI-2537 shines at apparent V-band magnitude 13.236 (faint and requiring research-grade or CCD telescopic photometry) in the Northern celestial hemisphere. The TOI-2537 system is a multi-planet architecture hosting 2 confirmed worlds, with TOI-2537 b sharing its stellar neighborhood alongside TOI-2537 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-2537 |
| Spectral Type | Unclassified |
| Effective Temp (Teff) | 4,870 K |
| Stellar Radius | 0.7710 R☉ |
| Stellar Mass | 0.7710 M☉ |
| Bolometric Luminosity | 0.3 L☉ |
| Metallicity [Fe/H] | 0.080 dex |
| Stellar Age | 1.100 Gyr |
| Apparent Magnitude | V: 13.236 · G: 12.730 |
| System Architecture | 1 Star, 2 Planets |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.371500 AU |
| Orbital Period | 94.102 days |
| Mean Orbital Velocity | 42.9 km/s |
| Orbital Eccentricity (e) | 0.36400 |
| Orbital Inclination (i) | 89.5920° |
| Mean Bulk Density | 1.61 g/cm³ (68 km/s vesc) |
| Insolation Flux | 7.4445 S⊕ (~10,132 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 603.300 LY (184.986 pc) |