An artist's rendering of a neutron star and pulsar. Depositphotos.

Mystery Unveiled: Pulsar’s Odd Behavior Explained with ESO Telescopes

European Southern Observatory's advanced telescopes have provided groundbreaking insights into the erratic behavior of a distant pulsar.


In a breakthrough astronomical venture, 12 state-of-the-art telescopes, encompassing three facilities of the European Southern Observatory (ESO), have shed light on the unusual activities of a distant pulsar named PSR J1023+0038, or simply J1023.

J1023, positioned roughly 4,500 light years away within the Sextans constellation, orbits a neighboring star. Throughout the past ten years, this pulsar has drawn matter from its counterpart, which gathers around J1023 in a disk formation, slowly descending towards it. The pulsar’s perplexing tendency to alternate between two luminosity modes, visible in ‘high’ and ‘low’ modes, has long baffled scientists.

Revelations from the Cosmic Frontier

Researcher Maria Cristina Baglio of New York University Abu Dhabi stated, “Envision massive cosmic cannonballs shooting out from a dense celestial body spinning at astonishing speeds.” She further clarified how these huge expulsions occur in mere tens of seconds, attributing this erratic brightness to such events.


Pulsars, essentially magnetized and deceased stars, cast out electromagnetic radiation. As they spin, this radiation traverses the universe, resembling a lighthouse. When this radiation aligns with Earth’s line of sight, the star’s luminosity seems to pulsate.

Francesco Coti Zelati from the Institute of Space Sciences in Barcelona elucidated, “An array of both terrestrial and space-based telescopes were marshaled for this observing mission.” This expedition encompassed ESO’s Very Large Telescope (VLT), New Technology Telescope (NTT), and the Atacama Large Millimeter/submillimeter Array (ALMA). During June 2021, they documented the system undergoing over 280 luminosity transitions.

The Underlying Dynamics

The continual shift in modes is instigated by the interactions between the pulsar’s particle wind and the inflowing matter. Zelati added that during the low mode, the inflowing matter is expelled in a streamlined jet, amassing closer to the pulsar. When this gathered matter gets bombarded by the pulsar’s wind, it heats up, illuminating the system in a high mode. Subsequently, the pulsar ejects clumps of this heated matter, leading to a luminosity decrease and a shift back to the low mode.


Future Explorations with ESO’s Telescopes

Despite these revelations, the celestial realm of J1023 remains a treasure trove for astronomers. ESO’s upcoming Extremely Large Telescope (ELT) in Chile promises an unparalleled view of J1023’s transitions. Sergio Campana from the INAF Brera Observatory anticipates, “The ELT will deliver pivotal insights into the intricate dynamics surrounding the pulsar during its mode shifts.”

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Written by Ivan Petricevic

I've been writing passionately about ancient civilizations, history, alien life, and various other subjects for more than eight years. You may have seen me appear on Discovery Channel's What On Earth series, History Channel's Ancient Aliens, and Gaia's Ancient Civilizations among others.

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