Mass-ratio and Magnetic Flux Dependence of Modulated Accretion from Circumbinary Disks

Author:

Noble Scott C.ORCID,Krolik Julian H.ORCID,Campanelli ManuelaORCID,Zlochower YosefORCID,Mundim Bruno C.,Nakano HiroyukiORCID,Zilhão MiguelORCID

Abstract

Abstract Accreting supermassive binary black holes (SMBBHs) are potential multimessenger sources because they emit both gravitational-wave and electromagnetic (EM) radiation. Past work has shown that their EM output may be periodically modulated by an asymmetric density distribution in the circumbinary disk, often called an “overdensity” or “lump;” this modulation could possibly be used to identify a source as a binary. We explore the sensitivity of the overdensity to SMBBH mass ratio and magnetic flux through the accretion disk. We find that the relative amplitude of the overdensity and its associated EM periodic signal both degrade with diminishing mass ratio, vanishing altogether somewhere between 1:2 and 1:5. Greater magnetization also weakens the lump and any modulation of the light output. We develop a model to describe how lump formation results from internal stress degrading faster in the lump region than it can be rejuvenated through accretion inflow, and predicts a threshold value in specific internal stress below which lump formation should occur and which all our lump-forming simulations satisfy. Thus, detection of such a modulation would provide a constraint on both mass ratio and magnetic flux piercing the accretion flow.

Funder

National Science Foundation

MEXT ∣ Japan Society for the Promotion of Science

Deutsche Forschungsgemeinschaft

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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