A half ring of ionized circumstellar material trapped in the magnetosphere of a white dwarf merger remnant. A new class of white dwarf merger remnants with X-ray emission

Key Points

This research aims to characterize the properties and emissions of a potential white dwarf merger remnant.
Identified the white dwarf ZTF J200832.79+444939.67 as a merger remnant
Analyzed its physical properties, such as temperature and mass
Examined the presence of circumstellar material and Balmer emission
Measured spin period and X-ray emission from the white dwarf
ZTF J200832.79+444939.67 exhibits a temperature of 35,500 K and a mass of 1.12 M_⊙
Detected strong magnetic fields ranging from 400 to 600 MG
Observed significant period derivative indicating spin-down
Found variable Balmer emission consistent with ionized gas in the magnetosphere
X-ray emissions suggest a link to circumstellar interactions or magnetically driven winds

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Observations reveal magnetosphere and X-ray emission from a white dwarf merger remnant's ionized material.

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Cristea et al. (2025) studied this question.

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