Astrophysics: Neutron stars with no foreign matter in their core

Astrophysics: Neutron stars with no foreign matter in their core

The new findings now speak against the hypothesis. As strange as objects are – they apparently don’t behave strangely at all. “It seems that these very exotic states of matter do not exist in the nucleus of a neutron star,” comments theoretical physicist George Pykerewicz of Florida State University. Then the phase transition in quark matter – if it exists at all – will only happen shortly past the critical threshold, from which a neutron star essentially collapses into a black hole. Its exact value is not known, it is believed to be about three solar masses. “The question is,” Watts says, “if a strange substance exists at high densities, when exactly did it form?”

If J0740 had gone through this phase transition and contained more easily compressible quark matter, it should have been more than nine to ten miles in size, according to Watts. But even if you take into account the uncertainties of the measurements, 22 kilometers in diameter would be a fairly obvious lower limit, according to Miller.

This means that if neutron stars produce quark matter, then only at some point beyond 2.1 solar masses. Protons and neutrons can be easily conserved even at the most extreme scales. “In any case, it seems that some models are now excluded,” Watts remarks.

Illustration of radiation bursting on a magnetLaden…

© NASA’s Goddard Space Flight Center (Ausschnitt)

Breakout on a Magnet | The illustration shows the outburst of radiation on a magnetar, a neutron star with a particularly strong magnetic field.

The fact that the measurement of the size of neutron stars is basically possible is due to a peculiarity of celestial bodies. They spin rapidly and with them the spots on their surface, releasing strong magnetic fields that send X-rays into space. Due to the heavy gravitational influence of denser objects, the radiation produced on the other side of the neutron star is also gravitationally bent and directed in our direction. With NICER, the arrival time of the X-ray flash can be recorded with high precision. This allows to draw conclusions about the diameter.

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