Implications Of Recent Observations For The Population Of Compact Galactic Binaries Observable By Lisa

Details Implications Of Recent Observations For The Population Of Compact Galactic Binaries Observable By Lisa Implications Of Recent Observations For The Population Of Compact Galactic Binaries Observable By Lisa

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722504n&link_type=abstract

American Astronomical Society, AAS Meeting #217, #225.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

Ultra compact galactic binaries, where at least one member is a white dwarf or neutron star, constitute the majority of LISA's individually detectable sources. In addition, they form the dominant unresolvable galactic foreground for LISA at frequencies below a few milliHertz. Furthermore, a handful of ultra-compact binaries, observed at optical, ultraviolet and X-ray wavelengths, are the only known verification sources, detectable by LISA within a few months of the start of its mission.
In the context of LISA, the majority of studies involving galactic binaries have been based on theoretical population synthesis, due to the paucity of electromagnetic observations. Recently, significant observational progress has been made in detecting new systems of compact single or double white dwarf binaries.
We consider the impact of revised local space density estimates of compact white dwarf binaries on LISA observations.
Firstly, we show that the number of resolvable detached and semi-detached systems decreases. Secondly, depending critically on the white dwarf binary formation channel assumed, we investigate how the astrophysical foreground of galactic ultra compact binaries can decrease.

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