Relativistic Binary Precession: Impact on Eccentric Binary Accretion and Multi-Messenger Astronomy
arxiv(2024)
摘要
Recent hydrodynamical simulations have shown that circumbinary gas disks
drive the orbits of binary black holes to become eccentric, even when general
relativistic corrections to the orbit are significant. Here, we study the
general relativistic (GR) apsidal precession of eccentric equal-mass binary
black holes in circumbinary disks (CBDs) via two-dimensional hydrodynamical
simulations. We perform a suite of simulations comparing precessing and
non-precessing binaries across a range of eccentricities, semi-major axes, and
precession rates. We find that the GR precession of the binary's semi-major
axis can introduce a dominant modulation in the binary's accretion rate and the
corresponding high-energy electromagnetic light-curves. We discuss the
conditions under which this occurs and its detailed characteristics and
mechanism. Finally, we discuss the potential to observe these precession
signatures in electromagnetic and gravitational wave (GW) observations, as well
as the precession signal's unique importance as a potential tool to constrain
the mass, eccentricity, and semi-major axis of binary merger events.
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