by In the universe there are great remains called Neutron Stars, and these stars get extremely powerful magnetic fields when matters out during their explosive Supernova asterflapenfallen. Scientists say that the discovery of this dynamo-like mechanism could solve the mystery of the so-called “Low-Field Magnetars”.
Magnetars are neutron stars with the most powerful magnetic fields of the universe, often hundreds of trillions times more powerful than the magnetosphere of the earth.
Low-Field Magnetars, discovered for the first time in 2010, his comparable stellar remains with magnetic fields about 10 to 100 times weaker than “classic” magnetars. Their origin was a puzzle – so far.
The team behind the new research carried out advanced numerical simulations to model the magnetic and thermal evolution of neutron stars.
This revealed a dynamo-like process with which a neutron star could develop a weaker magnetic field on the surface than is seen around typical magnetars.
This process includes supernova-geomed material that falls in during the “Proto-neutron star” phase of the evolution of these stellar remains. The result is known as the Tayler-Spruit Dynamo.
“This mechanism was theoretically presented almost a quarter of a century ago, but it was only recently reproduced with the help of computer simulations,” said Andrei Igoshev, research team leader and a scientist at the School of Mathematics, Statistics and Physics of the Newcastle University, in a statement.
The birth of ‘dead stars’ is complicated
Neutron stars are made when stars with more than 10 times the mass of the sun out of the fuel supply used for nuclear fusion in their cores.
This results in the stellar core, which has more than 1.4 times the mass of the sun (the so-called Chandrasekhar limit), which collapses under his own gravity.
That sends shock waves to the outside in the top layer of the star, which activates an enormous stellar explosion that blows away these layers and most of the mass of the dying star. This explosion is called a supernova of the core collapse.
This leaves the core, a proto-neutron star, in the process of becoming a 12-mile wide (20 kilometer-wide) stellar remnant, so close that, if it is brought to the earth, only a teaspoon of The component issue would weigh 10 million tons.
The rapid collapse of these stellar cores also has other consequences. Just like a skating skate in their arms to increase their spider speed, the collapse of neutron stars can “turn” these objects in such a way that some are able to turn up to 700 times per second.
In addition, the core forces collapsing magnetic field lines together, thereby increasing the strength of the magnetic fields of the dead stars.
That leaves an extremely closed, fast -rotating, very magnetic stellar remnant surrounded by a scale of shed material.
However, this material can eventually return to the point of origin, making the neutron star even more extreme and more unusual.
“Neutron stars are born in Supernova explosions,” said Igoshev. “Most external layers of a massive star are removed during the Supernova, but some material falls back, making the neutron star run faster.”
Igoshev explained that previous research has shown that this process plays a very important role in the formation of a magnetic field through the Tayler-Spruit Dynamo mechanism.
It is thought that the Tayler-Sprut Dynamo mechanism is the corner momentum of infoing plasma converts into magnetic fields in the neutron star. This is similar to how mechanical dynamos on earth convert kinetic energy into electrical energy.
“The magnetic field formed via this mechanism is very complicated with an internal field in the star that is much stronger than the external field,” Igoshev said.
Igoshev is now planning to set up a new research group at the University of Newcastle to further investigate the powerful, complicated and mysterious magnetic fields of neutron stars.
The team’s research was published on 4 February in the journal Nature Astronomy.
