Canadian Hydrogen Intensity Mapping Experiment detects New binary pulsar

Using the Canadian Hydrogen Intensity Mapping Experiment (CHIME), astronomers have detected a new radio pulsar in a binary framework with a massive non-degenerate companion star. The revelation of the pulsar, which got designation PSR J2108+4516, was detailed in a paper distributed September 14 on the arXiv pre-print server.

Pulsars are profoundly magnetized, rotating neutron stars producing a beam of electromagnetic radiation. They are usually detected as short bursts of radio emission; in any case, some of them are also noticed via optical, X-ray and gamma-ray telescopes.

Presently, an international team of astronomers drove by Bridget C. Andersen of McGill College in Montréal, Canada, reports the finding of a new rare sort of a binary pulsar — facilitating a massive companion. The detection was made using CHIME, a radio telescope having an exceptionally wide field of view, large gathering area and high responsiveness across the 400-800 MHz range.

"We found and initially monitored PSR J2108+4516 with the CHIME telescope, using the CHIME/FRB and CHIME/Pulsar backends to acquire various kinds of data," the researchers wrote in the paper.

All altogether, the team acquired almost three years of near-daily CHIME/Pulsar observations of PSR J2108+4516 reaching out from October 20, 2018 to September 3, 2021. Profile floats over beat phase indicated that the pulsar was encountering significant acceleration from circling with a massive binary companion.

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The observations of PSR J2108+4516 revealed that it has a twist time of about 0.58 seconds and orbital time of 269 days. The orbital erraticism was viewed as at a degree of approximately 0.09 and the pulsar's characteristic age was estimated to be around 2.1 million years. The surface magnetic field of PSR J2108+4516 was measured to be a few 1.2 trillion Gauss.

With regards to the companion object, the outcomes suggest that its mass ought to be somewhere in the range of 11.7 and 113 solar masses. The investigation discovered that the companion is a brilliant OBe star, known as EM* UHA 138, located at a distance of about 10,600 light years. The researchers estimate that the mass of this star is doubtlessly somewhere in the range of 17 and 23 solar masses.

Summarizing the outcomes, the astronomers underlined that PSR J2108+4516 is the 6th youthful pulsar with a massive non-degenerate companion so far detected.

"We have introduced the CHIME/FRB revelation and 2.8-yr CHIME/Pulsar timing of a new radio pulsar/massive-star binary, PSR J2108+4516, only the sixth such binary pulsar known," they concluded.

The authors of the paper added that PSR J2108+4516 may act as a rare laboratory for the exploration of massive star winds and circumstellar plates. They propose future optical spectroscopic observations of this pulsar to decide the companion type and to investigate whether it has a plate, as well as X-ray and gamma-ray studies to examine circle and wind interactions.