Gravitational waves and non-axisymmetric oscillation modes in mergers of compact object binaries

By Nikolaos Stergioulas, A. Bauswein, K. Zagkouris, Hans-Thomas Janka. 2011

133 citations recorded by the source corpus.

We study the excitation of nonaxisymmetric modes in the post-merger phase of binary compact object mergers and the associated gravitational wave emission. Our analysis is based on general-relativistic simulations, in the spatial confo rmal flatness approximation, using smoothed-particle-hydrodynamics for the evolution of matter, and we use a set of equal and unequal mass models, described by two nonzero-temperature hadronic equations of state and by one strange star equation of state. Through Fourier transforms of the evolution of matter variables, we can identify a number of oscillation modes, as well as several nonlinear components (combination frequencies). We focus on the dominant m = 2 mode, which forms a triplet with two nonlinear components that are the result of coupling to the quasiradial mode. A corresponding triplet of frequencies is identified in the g ravitational wave spectrum, when the individual masses of the compact objects are in the most likely range of 1.2 to 1.35 M⊙. We can thus associate, through direct analysis of the dynamics of the fluid, a specific frequency peak in the gravitational wave spectrum with the nonlinear component resulting from the difference between the m = 2 mode and the quasi-radial mode. Once such observations become available, both the m = 2 and quasiradial mode frequencies could be extracted, allowing for the application of gravitational-wave asterose ismology to the post-merger remnant and leading to tight constraints on the equation of state of h igh-density matter.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/416f6068a8f42b4f9d2a601fbb83aa81fe8f470a

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In Astronomy and Astrophysics

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SYSTEMATICS OF DYNAMICAL MASS EJECTION, NUCLEOSYNTHESIS, AND RADIOACTIVELY POWERED ELECTROMAGNETIC SIGNALS FROM NEUTRON-STAR MERGERS (2013, background): “The bulk matter of the binary components forms a rotating double- core structure where the two dense cores oscillate against each other (not visible because of the logarithmic density scale; see e.g. the descriptions in Bauswein et al. (2010b) and Stergioulas et al. (2011)).”