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Related Concept Videos

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Updated: Jul 23, 2025

Scattering And Absorption of Light in Planetary Regoliths
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A rotating white dwarf shows different compositions on its opposite faces.

Ilaria Caiazzo1, Kevin B Burdge2,3, Pier-Emmanuel Tremblay4

  • 1Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA, USA. ilariac@caltech.edu.

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Summary

Astronomers discovered a unique white dwarf star, ZTF J203349.8+322901.1, with one side of its atmosphere made of hydrogen and the other of helium. This "two-faced" star offers new insights into stellar evolution and the impact of magnetic fields on white dwarfs.

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Area of Science:

  • Stellar Astrophysics
  • White Dwarf Evolution
  • Planetary Science

Background:

  • White dwarfs are dense stellar remnants with Sun-like mass and Earth-like size.
  • Gravitational settling causes heavy elements to sink, leaving light elements like hydrogen or helium in the atmosphere.
  • White dwarf atmospheres transition from hydrogen to helium dominated as they cool below 30,000 Kelvin.

Purpose of the Study:

  • To report the discovery and observation of a unique transitioning white dwarf, ZTF J203349.8+322901.1.
  • To investigate the cause of its peculiar two-faced atmospheric composition (hydrogen and helium).
  • To explore the role of magnetic fields in white dwarf spectral evolution.

Main Methods:

  • Observational astronomy utilizing advanced telescopes to capture spectral data.
  • Analysis of atmospheric composition and temperature variations across the white dwarf's surface.
  • Comparison with existing models of white dwarf cooling and magnetic field effects.

Main Results:

  • Discovery of ZTF J203349.8+322901.1, a white dwarf with distinct hydrogen and helium-dominated atmospheric regions.
  • The observed inhomogeneity is likely caused by a weak magnetic field influencing surface conditions.
  • This finding suggests ZTF J203349.8+322901.1 is an extreme example of a class of magnetic, transitioning white dwarfs.

Conclusions:

  • The existence of ZTF J203349.8+322901.1 provides strong evidence for magnetic fields influencing white dwarf atmospheric composition.
  • This discovery aids in understanding the spectral evolution of white dwarfs.
  • Further study of this class of magnetic white dwarfs can illuminate fundamental stellar processes.