Astronomy:TOI-5624 e
 Artistic depiction of the TOI-5624 system (sizes to scale) compared to Mercury's orbit. TOI-5624 e is the fourth planet in the system, designated as 5624 e. | |
| Discovery | |
|---|---|
| Discovered by | Andrea Bonfant et al. |
| Discovery site | Transiting Exoplanet Survey Satellite |
| Discovery date | April 22, 2026 |
| Transit | |
| Orbital characteristics | |
| 0.1439+0.0014 −0.0015 astronomical unit|AU | |
| Eccentricity | 0 (fixed) |
| Orbital period | 21.489936±0.000029 d |
| Inclination | 89.405+0.049 −0.047 |
| 90 (fixed) | |
| Semi-amplitude | 2.27+0.74 −0.75 m/s |
| Star | TOI-5624 |
| Physical characteristics | |
| Mean radius | 3.247+0.042 −0.043 R🜨 |
| Mass | 8.9+2.9 −3.0 M🜨 |
| Mean density | 1.46±0.48 g/cm3 |
| Physics | 613.8+8.2 −8.1 K (340.65 °C; 645.17 °F) |
TOI-5624 e is the fourth and the second largest exoplanet discovered in the TOI-5624 system, located approximately 331 light-years from Earth in the constellation Ursa Major.[1][2] The discovery of the object was officially announced by an international team of astronomers led by Andrea Bonfant in late April 2026. The planet was detected using the transit method.[1][2]
Characteristics
Physical characteristics
| Neptune | TOI-5624 e |
|---|---|
|
|
The planet belongs to the class of sub-Neptunes. Its mass, determined by the radial velocity method, is 8.9+2.9
−3.0 M🜨. Using the European CHEOPS telescope, the planet's radius was determined with an uncertainty of less than 1.7%, which is 3.247+0.042
−0.043 R🜨.[1][2] The average density of the object is approximately 1.46±0.48 g/cm3, indicating the presence of a significant gaseous envelope or an icy component in its structure. Its equilibrium temperature is estimated at 613.8 K, which is about 341 °C.[1][2]
Orbit
The planet orbits its parent star with an orbital period of 21.489936±0.000029 d, and its orbit is at a distance of 0.1439+0.0014
−0.0015 astronomical unit|AU from the star. The orbital inclination, equal to 89.405+0.049
−0.047, ensures that the planet passes almost through the center of the stellar disk.[1][2]
Despite this, the orbit of TOI-5624 e is characterized by pronounced short-term dynamical instability. Observations have revealed significant transit timing variations (TTVs) with an amplitude of about 80 minutes. This effect is caused by gravitational interaction with the outer, non-transiting planet TOI-5624 f.[1][2] Data analysis has shown that the pair of planets e and f is in a configuration close to a 2:1 mean orbital resonance. The orbital period of the outer planet is 45.37 days, which creates regular gravitational perturbations that periodically accelerate and decelerate the motion of TOI-5624 e along its orbit.[1][2]
See also
- List of exoplanets discovered in 2026
- Methods of detecting exoplanets
- TOI-5624 f
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations". 2026-04-21. arXiv:2604.15035 [astro-ph.EP].
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Cowing, Keith (2026-04-19). "The Multi-planet System TOI-5624: Four Transiting Sub-Neptunes With An Outer Companion Revealed By Transit-timing Variations" (in en-US). https://astrobiology.com/2026/04/the-multi-planet-system-toi-5624-four-transiting-sub-neptunes-with-an-outer-companion-revealed-by-transit-timing-variations.html.
External links
- Martin, Pierre-Yves (2026). "Planet TOI-5624 e" (in en). https://exoplanet.eu/catalog/toi_5624_e--12043/.
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