Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection

Petra Suková; Michal Zajaček; Vojtěch Witzany; Vladimír Karas

doi:10.3847/1538-4357/ac05c6

journal article Aug 01, 2021

Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection

Petra Suková

Michal Zajaček

Vojtěch Witzany

Vladimír Karas

The Astrophysical Journal Vol. 917 No. 1 pp. 43 · American Astronomical Society

View at Publisher Save 10.3847/1538-4357/ac05c6

Abstract

Abstract
The close neighborhood of a supermassive black hole contains not only the accreting gas and dust but also stellar-sized objects, such as late-type and early-type stars and compact remnants that belong to the nuclear star cluster. When passing through the accretion flow, these objects perturb it by the direct action of stellar winds, as well as their magnetic and gravitational effects. By performing general-relativistic magnetohydrodynamic simulations, we investigate how the passages of a star can influence the supermassive black hole gaseous environment. We focus on the changes in the accretion rate and the emergence of blobs of plasma in the funnel of an accretion torus. We compare results from 2D and 3D numerical computations that have been started with comparable initial conditions. We find that a quasi-stationary inflow can be temporarily inhibited by a transiting star, and the plasmoids can be ejected along the magnetic field lines near the rotation axis. We observe the characteristic signatures of the perturbing motion in the power spectrum of the accretion variability, which provides an avenue for a multi-messenger detection of these transient events. Finally, we discuss the connection of our results to multiwavelength observations of galactic nuclei, with the emphasis on ten promising sources (Sgr A*, OJ 287, J0849+5108, RE J1034+396, 1ES 1927+65, ESO 253–G003, GSN 069, RX J1301.9+2747, eRO-QPE1, and eRO-QPE2).

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Details

Published: Aug 01, 2021
Vol/Issue: 917(1)
Pages: 43
License: View

Authors

Funding

European Union’s Horizon 2020 research and innovation programme Award: 894881

Czech Science Foundation Award: GACR 21-11268S

Polish National Agency for Academic Exchange Award: PPN/BCZ/2019/1/00069

Polish National Science Center Award: 2017/26/A/ST9/00756

Czech Academy of Sciences Award: LQ100032102

Cite This Article

Petra Suková, Michal Zajaček, Vojtěch Witzany, et al. (2021). Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection. The Astrophysical Journal, 917(1), 43. https://doi.org/10.3847/1538-4357/ac05c6

Stellar Transits across a Magnetized Accretion Torus as a Mechanism for Plasmoid Ejection

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