Estimating Gravitational Wave Source Parameters: The Effect Of Eccentricity

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Wave Generation And Sources, Experimental Tests Of Gravitational Theories

Scientific paper

Key parameters of gravitational wave sources such as mass, angular momentum and quadrupole moment can be estimated from the gravitational waves themselves, particularly in the case of high mass-ratio inspiralling binary sources. Continuing our study of the accuracy with which parameterized descriptions of compact astrophysical sources can be extracted from inspiral observations, we extend our calculations to include the effects on the analysis of the eccentricity of the orbit of the inspiralling body. Primarily using phase information from the inspiral, we directly match the computed gravitational waves from two different sources to demonstrate the extent to which duplications and ambiguity can occur, and thereby deduce limits on the accuracy with which the source parameters can be measured by this technique. Adding eccentricity increases the search space by one more dimension and otherwise complicates the analysis, but it makes the simulation much more realistic. Increasing eccentricity probably also decreases the signal-to-noise ratio for objects of a given mass and distance. We here investigate the extent to which it increases the number of cycles required to constrain the quadrupole moment and other source parameters.

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