Tidal disruption events by compact supermassive black hole binaries

ABSTRACT Stars can be tidally destroyed or swallowed by supermassive black hole binaries (SMBHBs). Using a large number of few-body simulations, we investigate the enhancement and suppression full partial disruption direct capture events hard SMBHBs with wide ranges key parameters, i.e. primary BH mass ($M_{\rm BH, 1}= 10^{5}{-}10^{8}\, {\rm M}_{\odot }$), binary ratio (10?3–1), semimajor axis to hardening radius (10?4–1), eccentricity (0.0–0.9) stellar $(0.3{-}3\, M}_{\odot})$. This is significant extension parameter space compared previous work. We show that encounter probabilities all three are well-described cross-section. The probability tidal (FTDEs) enhanced up factor 40–50 suppressed 10, relative single BHs, depending on parameters. Relativistic effects provide an additional FTDE less than 2–3 for $M_{\rm 1}> 10^{7}\, }$. fitting formula works range Partial occur multiple times before FTDEs captures, their greater three. Because induce spins loss, change orbits, it significantly affect overall rate shape light curves.