Misaligned snowplough effect and the electromagnetic counterpart to black hole binary mergers

Autor(es)

Pereira, Fabricia A. C. ^{[1, 2]} ; Lodato, Giuseppe ^[2] ; Rodrigues, Irapuan ^[1] ; Alves, Marcio E. S. ^[3] ; Price, Daniel J. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba, Av Shishima Hifumi 2911, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan - Italy

^[3] Univ Estadual Paulista, UNESP, Inst Ciencia & Tecnol, BR-12247004 Sao Jose Dos Campos, SP - Brazil

^[4] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800 - Australia

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 484, n. 1, p. 31-38, MAR 2019.
• Citações Web of Science: 0

Resumo

We estimate the accretion rates produced when a circumprimary gas disc is pushed into the primary supermassive black hole (SMBH) by the tidal force of the decaying secondary during a SMBH merger. Using the 3D Smoothed Particle Hydrodynamics (SPH) code PHANTOM, we extend previous investigations of co-planar discs to the case where the disc and binary orbital planes are misaligned. We consider a geometrically thin disc with inclination angles varying from 1 degrees to 180 degrees and a binary with mass ratio q=10(-3).We find that discs with small inclination angles (<10 degrees) produce an increase in luminosity exceeding the Eddington rate. By contrast, discs with inclinations between 20 degrees and 30 degrees show a less pronounced rise in the accretion rate, whilst discs inclined by 180 degrees show no peak in the mass accretion rate. While previous analytic work predicted that the effective tidal torque drops with increasing inclination angle, we show that the misaligned snowplough effect remains important even for angles larger than the disc aspect ratio. The rise in the accretion rate produced by discs inclined at small angles to the binary orbit can produce an electromagnetic counterpart to the gravitational wave signal emitted from final stages of the binary orbital decay. (AU)

• Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
• Beneficiário: Manuel Máximo Bastos Malheiro de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Temático