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Gravitational waves showed the size of neutron stars




  Гравитационные волны раскрыли размер нейтронных звезд

Astrophysicists used all available data on the event GW170817.

Astrophysicists were able to calculate the radius of neutron stars, light and gravitational signals from the fusion, which was registered in August 2017. The uncertainty in the estimates of this parameter has significantly deterred scientists from understanding the physics of their interior objects.

This writes the Chronicle.info with reference to rambler.ru.

According to new data, the radius of neutron stars is about 1

1.9 miles. The results were published in a joint work of the staff of the gravitational observatory LIGO (USA) Virgo (Italy) in the journal Physical Review Letters.

A neutron star is one of the last stages in the evolution of massive stars, they are the result of a supernova. The size of these stars is extremely small for space objects, although the mass corresponds approximately to the sun. On the inner structure of a neutron star differ from ordinary stars. Their insides mostly characterize the equation of state, d. H. The pressure dependence of the density.

Existing estimates of the size of neutron stars do not allow a clear statement as to what the equation of state is for their viscera. For this reason, there is a wide variety of models, including in particular the presence of charm-quark combinations in their cores.

In the new work, astrophysicists have all available data on the event GW170817, the first one uses significant association of two neutron stars, which was recorded as gravitational waves and electromagnetic signal in different frequency ranges. The authors analyzed the event in two ways: one is weakly dependent on the choice of a particular equation of state, and the second explicitly uses the equation of state that could describe the largest known neutron stellar mass of 1.97 suns. In the first case, the radii of the merged stars were 10.7 and 10.8 km with an accuracy of 20%. The second variant of the analysis of the two radii was about 11.9 kilometers with an error of not more than 12%.

This work is unlikely to end the dispute over the size of the neutron stars and their equation, at least because of three assumptions: both were typical of neutron stars, described by the same equation of state, rotating around their own axes at speeds observed by others Double neutron stars are typical.

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