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Astronomers Trace Mysterious Radio Pulses to Binary Star System

A white dwarf and red dwarf orbiting each other in Ursa Major emit radio signals, challenging previous assumptions about their sources.

Artistic illustration showing the radio pulses emitted by the binary star system: a white dwarf in orbit around a red dwarf. Credit Daniƫlle Futselaar/artsource.nl
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As the two stars orbit one another their magnetic fields clash, unleashing bursts of radio waves

Overview

  • The radio pulses, known as long-period transients (LPTs), occur every 125.5 minutes and last seconds to minutes, differing from fast radio bursts.
  • The binary system, located 1,600 light-years away, consists of a red dwarf and a white dwarf orbiting tightly around a common center of gravity.
  • Astronomers believe the radio emissions result from the interaction of the two stars' magnetic fields or the white dwarf's magnetic field alone.
  • This is the first time such pulses have been definitively traced to a white dwarf binary system, expanding understanding of radio signal sources beyond neutron stars.
  • Researchers plan further observations to study ultraviolet emissions and explore the stars' history, while searching for more LPTs in archival data.