LP 714-47 b
Astrophysical Synthesis & Habitability Characterization
LP 714-47 b is a confirmed sub-neptune exoplanet orbiting the star LP 714-47, located approximately 171.6 light-years (52.62 parsecs) from the Solar System. First announced in 2020 by Transiting Exoplanet Survey Satellite (TESS) using the Transit detection technique (producing an estimated primary transit depth of 0.5284% across the stellar disk), this world measures 4.25 Earth radii (0.38 Jupiter radii) and has a measured mass of 28.38 Earth masses. Combining its mass and radius yields a mean bulk density of 2.04 g/cm³ (an intermediate density indicative of a deep water-ice mantle or dense volatile envelope), a surface gravity of 1.57 g⊕ (15.4 m/s²), and an escape velocity of 28.9 km/s.
In its orbital architecture around LP 714-47, LP 714-47 b completes one full revolution every 4.052 Earth days at a semi-major axis of 0.04056 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 108.9 km/s (compared to Earth's 29.8 km/s). With a near-circular eccentricity of e = 0.022 (ranging from 0.0397 AU at periapsis to 0.0415 AU at apoapsis), the planet experiences minimal orbital distance variation.
⚠️ Thermal Regime (Irradiated / Hot Zone): At an equilibrium temperature of 723 K (+450°C / +842°F) and receiving 38.54 S⊕ (~52,459 W/m²), LP 714-47 b orbits interior to the runaway greenhouse boundary where surface liquid water cannot persist.
The host star LP 714-47 is classified as a low-mass red dwarf of spectral type M1 V with an effective photospheric temperature of 4,123 K, a radius of 0.536 R☉, a mass of 0.542 M☉, an estimated bolometric luminosity of 0.074 L☉. Stellar evolution modeling indicates an estimated stellar age of 2.9 Gyr and a metallicity of [Fe/H] = 0.05 dex (near-solar heavy-element abundance). From Earth, LP 714-47 shines at apparent V-band magnitude 12.492 (faint and requiring research-grade or CCD telescopic photometry) in the Southern 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 | LP 714-47 |
| Spectral Type | M1 V |
| Effective Temp (Teff) | 4,123 K |
| Stellar Radius | 0.5360 R☉ |
| Stellar Mass | 0.5420 M☉ |
| Bolometric Luminosity | 0.074 L☉ |
| Metallicity [Fe/H] | 0.050 dex |
| Stellar Age | 2.900 Gyr |
| Apparent Magnitude | V: 12.492 · G: 11.728 |
| System Architecture | 1 Star, 1 Planet |
🪐 Orbital & Physical Dynamics
| Semi-Major Axis (a) | 0.040560 AU |
| Orbital Period | 4.052 days |
| Mean Orbital Velocity | 108.9 km/s |
| Orbital Eccentricity (e) | 0.02200 |
| Orbital Inclination (i) | 87.5000° |
| Mean Bulk Density | 2.04 g/cm³ (28.9 km/s vesc) |
| Insolation Flux | 38.5441 S⊕ (~52,459 W/m²) |
| Habitable Zone Status | Exterior / Non-HZ |
| Celestial Distance | 171.600 LY (52.616 pc) |