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Glitch in the neutron star reveals its hidden secrets



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Neutron stars are not only the densest objects in the universe, they also rotate very fast and regularly. Until they do not do it.

Occasionally, these neutron stars begin to spin faster because portions of the star's interior migrate outward. It's called "glitch" and it gives astronomers a glimpse into what's in those mysterious objects.

In a paper published today in the journal Nature Astronomy a team from Monash University, ARC, gave the McGill University Center for Excellence in Gravitational Wave Research (OzGrav) in Canada and the University of Tasmania a survey 1

000 light-years away neutron star Vela Pulsar.

The author Greg Ashton of the Monash School of Physics and Astronomy and a member of OzGrav, Vela, is famous – not only because only 5% of the pulsars have interference, but also because Vela has interference about every three years. Paul Lasky, also from Monash and OzGrav.

By re-analyzing data from observations of the Vela Bug in 2016, which was co-authored by Jim Palfreyman of the University of Tasmani Ashton and his team found that the star turned even faster during the breakdown before relaxing to a final state.

According to Dr. Lasky, an ARC Future Fellow of the Monash School of Physics and Astronomy, and a member of OzGrav, made this observation (performed at the Mount Pleasant Observatory in Tasmania) particularly important as the scientists first got a look inside the star – and revealed it that the interior of the star actually exists three different components.

"One of these components, a soup of superfluous neutrons in the inner layer of the crust, first moves outward and strikes the rigid outer crust of the star, causing it to spin," Dr. Lasky.

"But then a second superfluid soup, moving in the core, intercepts the first one, causing the spin of the star to slow down.

This overshoot has been predicted a few times in the literature, but this is it the first time in real time was identified in observations, "he said.

Such a prediction of overshoot came from study co-author Dr. Ing. Vanessa Graber from McGill University, who visited the Monash team earlier this year as an international visitor to OzGrav.

Another According to Dr. Ashton eludes the observation of any explanation.

"Immediately before the glitch, we noticed that the star seems to slow its spin speed before turning again," Dr. Ashton No idea why that is, and it's the first time it's ever been seen.

"It could be related to the cause of the error, but we're honestly not sure," he said, adding that he considers this new paper to be suspicious, inspiring some new theories about neutron stars and glitches.


The radio telescope records a rare interference pulse in the regular pulse beat of a pulsar


Further information:
Rotation development of the Vela pulsar during the glitch impulse 2016, Naturastronomie (2019). DOI: 10.1038 / s41550-019-0844-6

Provided by
Monash University




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Glitch in the Neutron Star Reveals Its Hidden Secrets (2019, 12 Aug)
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