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Astrophysicists used all available data on the GW170817 event.
Astrophysicists were able to calculate the radius of neutron stars, light and gravitational signals from the merger recorded in August 2017. The uncertainty in the estimates of this parameter significantly prevented scientists from understanding the physics of the internal faces of these objects.
This writes the Chronicle.info with reference to rambler.ru.
According to new data, the radius of neutron stars is about 11.9 miles. The results were published in the joint work of employees 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 their mass corresponds roughly to that of the Sun. On the internal structure of a neutron star differ from ordinary stars. Their bowels mainly characterize the state equation, that is, the dependence of density as a function of pressure.
Existing estimates of the size of neutron stars do not allow one to draw an unambiguous conclusion about what the state equation characterizes their bowels. Because of this, there is a wide variety of styles, which include the presence of combinations of charm quarks in their hearts.
In this new work, astrophysicists used all available data on the GW170817 event, the first significant fusion of two neutron stars, recorded as gravitational waves and electromagnetic signals in different frequency ranges. The authors analyzed the event in two ways: one weakly dependent on the choice of a particular state equation and the second explicitly using the state equation that could describe the largest known mass of 1.97 solar neutrons. In the first case, the radius of the fused stars has been found to be 10.7 km and 10.8 km with an accuracy of 20%. The second variant of ray analysis was equal to about 11.9 kilometers with an error not exceeding 12%.
This work is unlikely to put an end to the disputes about the size of neutron stars and their state equation, at least because it is based on three assumptions: the two objects were typical of neutron stars, described by the same state equation and rotated around their own axes at speeds typical of other double neutron stars observed.
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