Exploring the Orbital Alignments of Galactic Close White Dwarf Binaries with LISA
Abstract
Using the proposed space gravitational wave detector LISA, we will be able to measure the geometrical configurations of 104 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 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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