Asian News International 15. January 2020, 1:58:56 p.m. IST
A recent study by the University of Warwick found that stars must exist in binary systems to generate gamma-ray bursts. Gamma-ray explosions are the brightest explosions in the universe caused by massive collapsing stars. Thousands of binary star systems were modeled for the study and found that the tidal effects of a companion star cause the collapsing star to rotate and generate a stream of material.
University astronomers suspect that the largest and brightest explosions in the universe occur two stars to burst a gamma ray.
The new investigation solves the mystery of how stars spin fast enough to create conditions for the launch of a beam of high-energy material into space, and has found that tidal effects such as those between moon and moon occur. Earth is that Answer.
The discovery reported in Monthly Notices of the Royal Astronomical Society is based on simulated models of thousands of binary star systems, ie solar systems orbiting two stars.
More than half of all stars are in binary star systems. This new research shows that they have to exist in binary star systems for the massive explosions to be generated. A long gamma-ray burst (GRB), the type examined in this study, occurs when a massive star, about ten times the size of our Sun, changes into a supernova, collapses into a neutron star or a black hole, and a relativistic beam of material enters fires space.
Instead of the star collapsing radially inward, it is flattened into a disk to obtain the angular momentum. When the material falls inwards, it is triggered by this angular momentum in the form of a beam along the polar axis.
In order to form this material beam, however, the star must rotate quickly enough to throw material along the axis. This is a problem because stars usually lose any rotation that they get very quickly. By modeling the behavior of these massive stars as they collapsed, the researchers were able to limit the factors that lead to the formation of a jet.
They found that the effects of the tide from a close neighbor – the same effect that the moon and earth held together in their rotation – could be responsible for causing these stars to rotate at the speed required to produce a gamma-ray burst is.
Gamma-ray bursts are the most luminous events in the universe and can be observed from Earth if your material beam is aimed directly at us. This means that we only see about 10 to 20 percent of the GRBs in our sky.
Leading author Ashley Chrimes, a PhD student at the University of Warwick's Department of Physics, said: "We predict what stars are or systems produce gamma-ray explosions that are the largest explosions in the universe. So far, it has been unclear what type of stars or binary systems you need to achieve this result.
"The question was how a star begins to spin or maintain its spin over time. We have found that the effects of a star's tides on its partner prevent it from slowing down, and in some cases it speeds them up, "added Ashley.
He went on to say," They are stealing rotational energy from their companion The consequence of this is that they then drift further away. What we found is that the majority of the stars are spinning fast, precisely because they are in a binary system. "
The study uses a collection of binary star evolution models developed by researchers from the University of Warwick and Dr. JJ Eldridge from the University of Auckland.
Using a technique called binary population synthesis, scientists can simulate this mechanism in a population of thousands of star systems, identifying the rare examples where such an explosion can occur.
Dr. Elizabeth Stanway of the University of New York, the Warwick Department of Physics said, "Scientists have not created detailed models for binary evolution in the past because it is a very complex calculation."
According to Stanway, this work took into account a physical mechanism in these models that we are using. I have not yet examined it, suggesting that binary files can generate enough GRBs with this method to explain the observed number.
She also believes that there has been a major dilemma in the metallicity of stars that produce gamma-ray bursts. As astronomers, we measure the composition of stars, and the prevailing path for gamma-ray explosions requires very few iron atoms or other heavy elements in the star atmosphere.
There was a mystery as to why we see a multitude of compositions in the stars.
Ashley continued: "With this model, we can predict how these systems should look in terms of their temperature and luminosity in observation mode and what properties the companion has We are now interested in using this analysis to investigate various astrophysical transients such as fast radio bursts and to model possibly rarer events such as star-wound black holes.
Find the latest and upcoming technical devices online on Tech2 Gadgets: Get Technological news, reviews and ratings for gadgets Popular gadgets including specifications, features, prices and comparisons for laptops, tablets and mobile devices.