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GR: Fachverband Gravitation und Relativitätstheorie

GR 7: Cosmo I, Relastro II, GW II

GR 7.4: Vortrag

Mittwoch, 2. April 2025, 14:30–14:50, ZHG008

Tidal resonances of stars in precessing orbits around a spinning black hole — •Matteo Stockinger¹ and Masaru Shibata^{1, 2} — ¹Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany — ²Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, 606-8502, Japan

Tidal disruptions of stars on the equatorial plane orbiting Kerr black holes have been widely studied. However thus far, there have been fewer studies of stars in inclined precessing orbits around a Kerr black hole.

We use the tensor virial equations to analyze perturbatively the influence of the precession on the star.

We show the presence of possible resonances in these systems for typical physical parameters of black hole-neutron star binaries in close orbits or of a white dwarf/an ordinary star orbiting a supermassive black hole.

This suggests the presence of a new instability before the tidal disruption limit is encountered in such systems.

Keywords: Tidal resonance; Kerr black hole; Astrophysical fluid dynamics