Astronomy:TOI-5624 d
 Artistic depiction of the TOI-5624 system (sizes to scale) compared to Mercury's orbit. TOI-5624 d is the third and largest planet in the system, designated as 5624 d. | |
| Discovery | |
|---|---|
| Discovered by | Andrea Bonfant et al. |
| Discovery site | Transiting Exoplanet Survey Satellite |
| Discovery date | April 22, 2026 |
| Transit | |
| Orbital characteristics | |
| 0.1067+0.0010 −0.0011 astronomical unit|AU | |
| Eccentricity | 0 (fixed) |
| Orbital period | 13.731468+0.000042 −0.000041 d |
| Inclination | 89.69+0.20 −0.18 |
| 90 (fixed) | |
| Semi-amplitude | 1.45±0.65 m/s |
| Star | TOI-5624 |
| Physical characteristics | |
| Mean radius | 3.584+0.051 −0.050 R🜨 |
| Mass | 4.9±2.2 M🜨 |
| Mean density | 0.59+0.27 −0.26 g/cm3 |
| Physics | 712.6+9.5 −9.4 K (439.45 °C; 823.01 °F) |
TOI-5624 d is the third and largest discovered exoplanet orbiting the star TOI-5624, with a size approximately three and a half times the diameter of Earth. The planet was confirmed in late April 2026 using the transit method.[1][2]
Characteristics
Physical characteristics
| Neptune | TOI-5624 d |
|---|---|
|
|
This planet is a puffy sub-Neptune. Its mass equals 4.9±2.2 M🜨, and its radius is 3.584+0.051
−0.050 R🜨.[1][2] This makes it the largest in radius among the four transiting bodies in the system. The average density is extremely low, about 0.59+0.27
−0.26 g/cm3, which is comparable to the density of Saturn.[1][2] This suggests the presence of an extended and massive atmosphere, constituting a significant part of the planet's volume. Consequently, the planet has a high transmission signal, making it a priority target for atmospheric studies using the James Webb Space Telescope.[1][2]
Orbit
The planet's orbital period is 13.731468+0.000042
−0.000041 Earth days at an average distance from its parent star of 0.1067+0.0010
−0.0011 astronomical unit|AU . The equilibrium temperature is estimated at 712.6 K, or 439.45 °C.[1][2]
See also
- List of exoplanets discovered in 2026
- Methods of detecting exoplanets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "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 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 d" (in en). https://exoplanet.eu/catalog/toi_5624_d--10899/.
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