New binary pulsar discovered using CHIME

Two-second section of CHIME/FRB density data from early transit of PSR J2108+4516 on October 13, 2018. Credit: Andersen et al. , 2022.

Using the Canadian Hydrogen Intensity Mapping Experiment (CHIME), astronomers have discovered a new radio pulsar in a binary system with a massive, undecaying companion star. The discovery of the pulsar, which has the designation PSR J2108 + 4516, is detailed in a paper published on September 14 on the arXiv server ahead of print.

Pulsars are highly magnetized and rotate neutron stars It emits a beam of electromagnetic radiation. They are usually detected as short bursts of radio emission; However, some of them have also been observed via optical, x-ray and gamma-ray telescopes.

Now, an international team of Astronomy scientists Led by Bridget C. Andersen of McGill University in Montreal, Canada, reports the discovery of a new rare species of binary pulsar—Hosting a formidable companion. Discovered with CHIME, a radio telescope that has a very wide field of view, a large collection area and high sensitivity over the 400-800MHz range.

“We initially detected and monitored PSR J2108 + 4516 with a CHIME telescope, using CHIME/FRB and CHIME/Pulsar backgrounds to obtain different types of data,” the researchers wrote in the research paper.

In all, the team obtained nearly three years of near-daily CHIME/Pulsar observations of PSR J2108+4516 extending from October 20, 2018 to September 3, 2021. Personal drifts on the pulse phase indicated that the pulsar was experiencing significant acceleration from orbit with a companion Great duo.

Observations of the PSR J2108 + 4516 revealed that it has a rotation period of about 0.58 seconds and orbital 269 ​​days. The orbital eccentricity was found at a level of about 0.09 and the characteristic age of the pulsar was estimated to be about 2.1 million years. The surface magnetic field of PSR J2108 + 4516 has been measured to be about 1.2 trillion gauss.

When it comes to the companion object, the results indicate that its mass should be between 11.7 and 113 solar masses. The study found that the companion is a bright OBe star, known as EM*UHA 138, located at a distance of about 10,600 light-years. Researchers estimate that the mass of this star is likely to be between 17 and 23 solar masses.

Summing up the results, the astronomers confirmed that PSR J2108 + 4516 is the sixth young pulsar with a non-decaying companion discovered so far.

They concluded, “We have provided the CHIME/FRB discovery and 2.8-year CHIME/Pulsar timing of a new massive radio pulsar/binary star, PSR J2108+4516, which is only the sixth known binary star.”

The paper’s authors added that PSR J2108+4516 may serve as a rare laboratory for exploring massive stellar winds and stellar disks. They propose future optical spectroscopic observations of this pulsar in order to determine the companion type and investigate whether it contains a disk, as well as X-ray and gamma-ray studies to examine the interactions of the disk and wind.

Astronomers have discovered a new pulsar of a thousandth of a second

more information:
Bridget C. Andersen et al, CHIME discovery of a binary star with a massive non-declining companion. arXiv: 2209.06895v1 [astro-ph.HE]And the

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