The discovery of a white dwarf blasting out radiation every 5 minutes is the second white dwarf found to 'pulse' at a periodic rate, confirming it as a new class of star.
. “The magnetic fields in white dwarfs can be more than a million times stronger than the magnetic field of the Sun, and the dynamo model helps to explain why. The discovery of J1912−4410 provided a critical step forward in this field.”
The magnetic fields of the white dwarfs in AR Sco and J1912-4410 might be the key to understanding the cause of their systems’ characteristic pulse. “We used data from a few different surveys to find candidates, focusing on systems that had similar characteristics to AR Sco … After observing a couple dozen candidates, we found one that showed very similar light variations to AR Sco,” Pelisoli said. “Our follow-up campaign with other telescopes revealed that every five minutes or so, this system sent a radio and X-ray signal in our direction.”
The thinking is that the magnetic field of the spinning white dwarf is striking the companion star with radiation and high-energy, electrically charged particles at regular intervals as the white dwarf rotates. These periodic magnetic lashings of the companion star then create a burst of radio and X-ray radiation, which we can observe when looking at the system.
"We are excited to have independently found the object in the X-ray all-sky survey performed with SRG/eROSITA,” Dr. Axel Schwope, the head of X-ray astronomy at the Leibniz Institute for Astrophysics Potsdam who is leading a complementary study soon to be published as a letter in Astronomy and Astrophysics, said.
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