Newly Discovered Star Defies Known Physics

Newly Discovered Star Defies Known Physics

Why in the News ?

Scientists have discovered a unique star, ASKAP J1832-0911, emitting both radio waves and X-rays, unlike any star seen before. This adds to a mysterious class of celestial bodies called long-period radio transients, first identified only in 2020.

What Makes ASKAP J1832-0911 Unique ?

• Located 15,000 light-years away in the Scutum constellation.
• Emits radio and X-ray pulses every 44 minutes, a rare phenomenon.
• Belongs to the newly discovered class called long-period radio transients.
• Most objects in this category emit only radio waves; this is the first to emit X-rays
• Findings published on May 28 in the journal Nature.

Scientific Observations and Hypotheses

• Observed using NASA’s Chandra X-ray Observatory and ASKAP radio telescope in Australia.
• Possible explanations include a magnetar (a neutron star with extreme magnetic fields) or a white dwarf in a tight binary system.
• None of the existing theories fully explain all features, indicating unknown stellar mechanisms.
• Scientists noted sudden radio brightness from November 2023 to February 2024, coinciding with X-ray emissions.

Significance and Future Outlook

• Only 10 known long-period radio transients exist, all still poorly understood.
• The brightening and X-ray emission make ASKAP J1832-0911 exceptional.
• Researchers suggest radio waves may result from interaction between the white dwarf and companion star.
• Indicates new astrophysical processes may be at play, warranting further study of this rare cosmic object.