The role of magnetic field for quiescence-outburst models in CVs

TL;DR

This paper explores how magnetic fields influence the quiescence and outburst cycles in Cataclysmic Variables, proposing that magnetic dynamics are crucial for understanding and modeling these phenomena.

Contribution

It introduces the idea that magnetic fields play a dual role in CV outburst models, affecting matter flow and outburst modes, and suggests integrating stochastic resonance in dynamo models for better understanding.

Findings

Magnetic fields activate specific accretion pathways.

Magnetic influence may switch outburst modalities.

Proposes future MHD modeling with stochastic resonance.

Abstract

In this paper we present the elementary assumptions of our research on the role of the magnetic field in modelling the quiescence-outbursts cycle in Cataclysmic Variables (CVs). The behaviour of the magnetic field is crucial not only to integrate the disk instability model (Osaki 1974), but also to determine the cause and effect nexus among parameters affecting the behavior of complex systems. On the ground of our interpretation of the results emerging from the literature, we suggest that in models describing DNe outbursts, such as the disk instability model, the secondary instability model (Bath 1973) and the thermonuclear runaway model (Mitrofanov 1978), the role of the magnetic field is at least twofold. On the one hand, it activates a specific dynamic pathway for the accreting matter by channelling it. On the other hand, it could be indirectly responsible for switching a particular outburst modality. In order to represent these two roles of the magnetic field, we need to integrate the disk instability model by looking at the global behaviour of the system under analysis. Stochastic resonance in dynamo models, we believe, is a suitable candidate for accomplishing this task. We shall present the MHD model including this mechanism elsewhere.