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This is the 'black widow' pulsar that breaks records by being the most massive neutron star so far

The stellar object is considered to be the densest seen from Earth, given that neutrons and neutrons are deposited inside its core. quarks. However, no evidence of exotic matter such as kaons, which are strange quarks, was observed.

A group of researchers from American scientific institutions revealed that a pulsar of the ‘ black widow’, designated as PSR J0952-0670, set a record for being the most massive known neutron star so far since its mass is 2.35 times more than that of the Sun (0.17 solar masses), reported this Tuesday the University of California at Berkeley.

According to the authors of the study, published in The Astrophysical Journal Letters, PSR J0952-0670, located at 3,000 light years away from Earth, is part of a binary cosmic system called ‘black widow’, because it absorbs material from its stellar companion, smaller in size, just like its arachnid namesake. This causes both the mass and the speed of rotation of the neutron star to increase.

PSR J0952-0670 is one of the fastest spinning pulsars in the Milky Way

Scientists determined that PSR J0952-0670 broken to a speed of 707 times per second, making it one of the fastest spinning pulsars in the Milky Way. Likewise, they considered that the pulsar is the densest stellar object seen from Earth, since neutrons and quarks are deposited inside its nucleus, which constitutes the natural protons and neutrons. However, they reiterated that there is no exotic matter such as kaons, which are particles containing a strange quark.

“A high maximum mass for neutron stars suggests that it is a mixture of nuclei and their quarks are dissolved up and down to the nucleus,” commented Stanford University astronomer Roger Romani, adding that “this rules out many proposed states of the matter, especially those with an exotic interior composition”.

To calculate the mass of the neutron star, researchers made comparisons of the visible light spectrum of its stellar companion through observations with the Low-Resolution Imaging Spectrometer. Images were obtained with the Keck I telescope at the WM Keck Observatory, located in Hawaii. This evaluation also allowed us to know the orbital speed of the minor star (6.4 hours), as well as its size (20 times the mass of Jupiter).

In addition, they contemplate the possibility that it becomes an isolated millisecond pulsar, once the PSR J0952-0670 h aya completely devoured his star. This name is due to the fact that the pulsar will have an even faster rotation speed.

“As the companion star evolves and begins to become a red giant, material spills onto the star of neutrons and that makes it spin”, pointed out Alexei Filippenko, who assured that “as it spins, it now becomes incredibly energized, and a wind of particles begins to come out of the neutron star”. “That wind then hits the donor star and starts shedding material, and over time the donor star’s mass decreases to that of a planet. If more time passes, it disappears completely,” Filippenko said.

“So this is how lone millisecond pulsars could form. They weren’t alone, to begin with and had to be in a binary pair, but gradually they vaporized their companions, and now they’re lone”, Indian.

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