Using EM-determined orbital phases, the fourfold degeneracy in the transverse projection of a close white dwarf binary's angular momentum from LISA data can be reduced to a twofold degeneracy.
Exploring the Orbital Alignments of Galactic Close White Dwarf Binaries with LISA
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abstract
Using the proposed space gravitational wave detector LISA, we will be able to measure the geometrical configurations of $\sim 10^4$ close white dwarf binaries in our Galaxy. The obtained data will be an entirely new resource to examine the randomness of their orbital orientations. Partly motivated by a recent reported on the systematic alignments of bulge planetary nebulae, we discuss the outlook of the orientational analysis with LISA. We find that a quadrupole pattern as small as $\sim 0.05$ can be detected for bulge white dwarf binaries, owing to their large available number. From such a pattern analysis, we might geometrically explore fossil records in our Galaxy billions of years ago.
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A Multimessenger Strategy for Downselecting the Orientations of Galactic Close White Dwarf Binaries
Using EM-determined orbital phases, the fourfold degeneracy in the transverse projection of a close white dwarf binary's angular momentum from LISA data can be reduced to a twofold degeneracy.