Models of Evolving Galactic DWD Populations Projected onto LISA's Observational Domain

Details Models of Evolving Galactic DWD Populations Projected onto LISA's Observational Domain Models of Evolving Galactic DWD Populations Projected onto LISA's Observational Domain

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114007g&link_type=abstract

American Astronomical Society, AAS Meeting #211, #140.07; Bulletin of the American Astronomical Society, Vol. 39, p.990

Physics

Scientific paper

Double White Dwarf (DWD) binaries are considered to be the most promising sources of Gravitational Waves (GWs) for the proposed space based GW detector LISA. We study the properties and evolution of the Galactic population of DWDs with respect to the absolute GW amplitude-frequency (rh-f) domain. We use the Binary Stellar Evolution (BSE) code developed by Hurley et al. (2002) to generate a population of DWDs, which we then evolve on the basis of the formalism developed in Gokhale et al. (2007). We show that the DWDs with different compositions populate distinct sub-domains on the rh-f plane. This gives us valuable information on the type and the composition of astrophysically interesting objects such as AM CVn systems and the progenitors of Type Ia supernovae. We compare our results with those published in the literature and investigate the reasons for any differences. Finally, we interpret the population synthesis results using a semi-analytical formalism that enables us to determine the present-epoch location of a DWD system on the absolute rh-f plane once its age and location at birth have been specified.
This work has been supported, in part, by NASA/ATP grant NNX07AG84G, NSF grant AST-0407070, PHY 03-26281, PHY 06-00953 and PHY 06-53462. This work is also supported by the Center for Gravitational Wave Physics, which is supported by the National Science Foundation under cooperative agreement PHY 01-14375.

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