Astronomers think they have found the first naked core of exoplanets, reported in a paper in the journal Nature. Probably it belonged to the gas giant, which has lost its outer shell due to collision with another planet or getting too close to the parent star.
Internal structure of gas giants is still poorly known. Challenges to scientists because of the inability to directly look into the depths of the planets, lead to the fact that even in the case with the heavenly bodies of the Solar system, there is still great uncertainty. So exoplanets are subjected to a rare evolutionary processes, can serve as a natural laboratory to test current theories and studies of the internal structure of objects such as Saturn. Special value from this point of view represent the planets in the “wilderness of Neptune” — close to the star region, where almost not observed planets the size of Neptune and the mass of about one-tenth the mass of Jupiter.
David Armstrong (David J. Armstrong) together with colleagues announced the discovery of one of these rare heavenly bodies during the analysis of observations made with a telescope Transiting Exoplanet Survey Satellite (TESS). Exploring the fall in the brightness of stars, which appear during the passage in front of the sun, another planet, astronomers have discovered an unusual object TOI 849b. It revolves around a yellow dwarf, distance from the Earth at 730 light years. One revolution around the sun celestial body makes for 18 hours, and its surface temperature reaches 1800 degrees Kelvin, however, significantly more.
Despite the fact that the TOI 849b radius close to the radius of Neptune (he is 3.4 earth), its mass is almost three times greater than the mass of the gas giant, which makes this object the most dense Neptune from all ever of open scientists. So astronomers doubt that a heavenly body has an extensive gas shell — type it looks more like a Land. However, models that fully describe the structure of earth-like planets of these masses does not exist today.