Astronomers have discovered a pair of neutron stars with very different masses

Astronomers have found a neutron star system in which one component is much more massive than the other. This may help to explain why the gravitational surge GW170817, was three years ago, and the ensuing outbreak of bulanovoi into space was emitted so much hot matter, reported in an article in the journal Nature.

In August 2017 astronomers first recorded gravitational waves from the merger of two neutron stars — very dense compact objects that are formed due to a supernova explosion. The explosion followed by the outbreak of Bulanovoj, which was watched by about 70 ground-based and space-based observatories, as well as powerful gamma-ray burst, which helped to confirm the nature of this phenomenon. However, with this space it was thrown unexpectedly large amount of material. Researchers have offered different explanations for the observed phenomena, and now they were able to verify one of the hypotheses.

Astronomer Robert Feldman (Robert Ferdman) from the University of East Anglia, along with colleagues examined the data from the radio telescope, “Arecibo” on the pulsar PSR J1913+1102, which opened in 2012. Researchers were aware that it is a double neutron star, but the parameters of the system remained a mystery. After analyzing the frequency of the pulsations of PSR J1913+1102 and comparing it with the predictions of the models, the astronomers were able to accurately assess the characteristics of its constituent components.

It turned out that it consists of two quite different objects. The mass of the first neutron star is the sun of 1.62, while the mass of her companion — only 1.27 solar masses. Until now, astronomers were able to access only one such system, PSR J0453+1559. However, if the predicted time before the merger of neutron stars is a hundred times greater than the age of the Universe, PSR J1913+1102 it will happen pretty soon in the cosmic sense just 470 million years, which makes this system unique today.

The distance between the bodies is approximately 1.2 million miles, and orbit around a common center of mass they commit five hours. Astronomers believe that the larger pulsar was born first, after which he began to capture the substance of his companion, and as a result, gained momentum, and spin. And since one neutron star is significantly more than the other, at the confluence the form of its companion will be distorted under the action of tidal forces, resulting in the cosmos will be thrown more hot material than merging identical neutron stars.

In addition, the discovery by researchers confirms that asymmetric neutron stars may not be as rare as previously thought. According to Ferdman, at least one of ten double neutron stars consists of two different mass components.

The merger of neutron stars can be used to estimate the rate of expansion of the Universe, which is expressed through the Hubble constant. Recently, astronomers have shown that to reduce the differences in the estimates will need to observe 15 such events.

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