Unfortunately, it is very hard to see details such as the ring of asteroids in other systems. Finally, astronomers were able to do it. The star that at a distance of 320 light years from us, they found something similar to the Kuiper belt of the Solar system.
For the first time in history, failed to discern such detail as the inner ring, polymetric method. The opening allows you to explore the features and important stage in the development of such systems, reports Science Alert.
Where he discovered the asteroid belt
The star HD 141569A is quite interesting and well-studied object. She has a combination of two red dwarf in the last stage of their life cycle. But bright and hot HD 141569A only 5 million years. By mass it is about three times greater than the Sun. Refers to the type of main sequence stars of spectral class B.
In 1999 the young star found a disk with rings of high density at a distance of 220 and 360 astronomical units. It remains matter, much of which went to the formation of the star itself. It is believed that over time, these fragments are collected in the planet.
The gap in the disk of HD 141569A hinted at the presence there of the planet.
Traces of the rings stars / Bruzzone
In our Solar system too, there are remnants of the accretion disk, from which 4.6 billion years ago the planets formed. We call this ring the Kuiper belt. The belt of icy debris located beyond the orbit of Neptune. Pluto with its average orbit is 39.5 astronomical units is the Kuiper belt.
What remains from the protoplanetary disk to the end of the process of formation of system is called a residual disk. Its diameter can reach hundreds of astronomical units. The disk of HD 141569A is an intermediate stage between the protoplanetary and residual.
Why it’s interesting
Such hybrid disks are of great interest to planetary scientists, because thanks to them you can understand how gas giants are formed, and how the growing planets interact with the gas and dust in the disk.
Learning sparse and twisted electromagnetic radiation from this region of space, astronomers under the leadership of Juan Sebastian Bruzzone from the University of Western Ontario (Canada) were able to remove similar ring in HD 141569A. Maximum density is observed at the distance of 44 astronomical units from the star.
Scientists have found not only evidence of planet formation, but the traces of the ring closer to the star.
In particular, they noticed the spiral arm, a feature that is rarely found in protoplanetary disks. And two outer rings. The characteristics of spiral arms, scientists concluded that the mass of a planet like our own Jupiter.
It is the detection of such a disk is already a huge achievement. But accompanying analysis and the study has made an even bigger contribution to the study of how the planets formed.
The authors named found the ring “a great laboratory for studying disks dynamically perturbed.”