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White Dwarf Magnetism

TYPEAstrophysics Seminar
Speaker:Sivan Ginzburg
Affiliation:HUJI
Organizer:Shmuel Bialy
Date:23.04.2025
Time:14:30 - 15:30
Location:Lidow 620
Abstract:

Ostensibly, white dwarfs are rather boring objects - gradually cooling down at an easily predictable pace, eventually freezing and forming a crystal lattice. Therefore, the discovery of strong magnetic fields for many white dwarfs came as a surprise.
I will explore a recently proposed suggestion that white dwarfs generate their strong magnetic fields as a byproduct of their crystallization process, similarly to the Earth's magnetic field. Specifically, I will focus on the time it takes magnetic fields to diffuse and break out to the surface where they may be observed. I will conclude with interesting implications for the late stages of stellar evolution.