Outflows from accreting super-spinars

TL;DR

This paper investigates accretion onto super-spinning Kerr objects without event horizons, revealing hot equatorial outflows driven by repulsive gravity, which can significantly impact mass accretion rates.

Contribution

It provides the first numerical simulation analysis of accretion onto super-spinars, highlighting unique outflow mechanisms distinct from black hole jets.

Findings

Presence of hot outflows around super-spinars

Outflows driven by repulsive gravitational forces

Potential reduction in gas mass accretion rate

Abstract

In this paper we continue our study on the accretion process onto super-spinning Kerr objects with no event horizon (super-spinars). We discuss the counterpart of the Bondi accretion onto black holes. We first report the results of our numerical simulations. We found a quasi steady-state configuration for any choice of the parameters of our model. The most interesting feature is the presence of hot outflows. Unlike jets and outflows produced around black holes, which are thought to be powered by magnetic fields and emitted from the poles, here the outflows are produced by the repulsive gravitational force at a small distance from the super-spinar and are ejected around the equatorial plane. In some circumstances, the amount of matter in the outflow is considerable, which can indeed significantly reduce the gas mass accretion rate. Finally, we discuss a possible scenario of the accretion process in more realistic situations, which cannot be simulated by our code.