Magnetic white dwarfs with debris discs
Baybars K\"ulebi, K. Yavuz Ek\c{s}i, Pablo Lor\'en-Aguilar, Jordi, Isern, Enrique Garc\'ia-Berro

TL;DR
This paper models the interaction between magnetic white dwarfs and debris discs formed from mergers, showing that magnetic accretion can explain the observed slow rotation periods of these stars.
Contribution
It introduces a new model for disc evolution under magnetic accretion and demonstrates its ability to reproduce observed white dwarf rotation periods.
Findings
Magnetospheric interaction causes significant spin down of white dwarfs.
Model reproduces observed rotation periods for magnetic white dwarfs with fields >10 MG.
Turbulence can be sustained during late evolution phases, explaining fast rotators.
Abstract
It has long been accepted that a possible mechanism for explaining the existence of magnetic white dwarfs is the merger of a binary white dwarf system, as there are viable mechanisms for producing sustainable magnetic fields within the merger product. However, the lack of rapid rotators in the magnetic white dwarf population has been always considered a problematic issue of this scenario. Smoothed Particle Hydrodynamics simulations show that in mergers in which the two white dwarfs have different masses a disc around the central compact object is formed. If the central object is magnetized it can interact with the disc through its magnetosphere. The torque applied by the disc changes the spin of the star, whereas the transferred angular momentum from the star to the disc determines the properties of the disc. In this work we build a model for the disc evolution under the effect of…
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