Compact star deformation and universal relationship for magnetized white dwarfs

TL;DR

This paper investigates the equilibrium, deformation, and universal I-Love-Q relationships of magnetized white dwarfs, considering rotation and magnetic effects, and finds that the I-eccentricity-Q relationship is more universal.

Contribution

It introduces a study of magnetized white dwarfs using relativistic equations and explores universal relationships, including a new insight into the I-eccentricity-Q relationship's universality.

Findings

The I-eccentricity-Q relationship is more universal than I-Love-Q.

Equilibrium configurations of magnetized white dwarfs are modeled using relativistic Thomas-Fermi EOS.

Universal relationships are extended to include magnetic and rotational effects in white dwarfs.

Abstract

Recently super-Chandrasekhar mass limit has been derived theoretically in presence of strong magnetic field to complement experimental observations. In the framework of Newtonian physics, we have studied the equilibrium configurations of such magnetized white dwarfs by using the relativistic Thomas-Fermi equation of state for magnetized white-dwarfs. Hartle formalism, for slowly rotating stars, has been employed to obtain the equations of equilibrium. Various physical quantities of uniformly rotating and non-rotating white dwarfs have been calculated within this formalism. Consequently, the universality relationship between the moment of inertia(I), rotational love number($\lambda$) and spin induced quadrupole moment(Q), namely the I-Love-Q relationship, has been investigated for such magnetized white dwarfs. The relationship between I, eccentricity and Q i.e. I-eccentricity-Q relationship has also been derived. Further, we have found that, the I-eccentricity-Q relationship is more universal in comparison to I-Love-Q relationship.