Astronomers have described the eccentric hot Neptune, which is seven times heavier than Earth. They suggest that the celestial body did not originate within its system.
Astronomers at the Harvard-Smithsonian Center for Astrophysics investigated the evolution of the hot Neptune K2-25, a transiting exoplanet with an orbital period of only 3.48 days. Its estimated mass is approximately equal to the seven masses of the Earth.
The advantage of K2-25 is that it is located in a young star cluster, whose age is about 650 million years. Knowing this age, scientists plan to establish in more detail the properties of the celestial body and study the evolution of its origin.
The team also analyzed twenty-two inconsistent planet transits obtained using MEarth ground observatories, an IRAC / Spitzer mission camera, and a Kepler mission, simulating each of the transits separately before combining the findings. According to their estimates, the period of time during which the orbit will become circular after the migration is about 410 Ma, which approximately corresponds to the age of the system.
Scientists were looking for evidence of other planets in the system, but have not yet been able to find them. Researchers plan to continue their observations and find out the remaining properties of the celestial body and the star cluster around it. So far, all the data is consistent with the fact that Neptune originated outside its current system.