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Gravitational-wave Emission from Compact Galactic Binaries

Nissanke, Samaya and Vallisneri, Michele and Nelemans, Gijs and Prince, Thomas A. (2012) Gravitational-wave Emission from Compact Galactic Binaries. Astrophysical Journal, 758 (2). Art. No. 131. ISSN 0004-637X.

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Compact Galactic binaries where at least one member is a white dwarf (WD) or neutron star constitute the majority of individually detectable sources for future low-frequency space-based gravitational-wave (GW) observatories; they also form an unresolved continuum, the dominant Galactic foreground at frequencies below a few mHz. Due to the paucity of electromagnetic observations, the majority of studies of Galactic-binary populations so far have been based on population-synthesis simulations. However, recent surveys have reported several new detections of WD binaries, providing new constraints for population estimates. In this article, we evaluate the impact of revised local densities of interacting WD binaries on future GW observations. Specifically, we consider five scenarios that explain these densities with different assumptions on the formation of interacting systems; we simulate corresponding populations of detached and interacting WD binaries; we estimate the number of individually detectable GW sources and the magnitude of the confusion-noise foreground, as observed by space-based detectors with 5 and 1 Mkm arms. We confirm earlier estimates of thousands of detached-binary detections, but project only a few ten to a few hundred detections of interacting systems. This reduction is partly due to our assessment of detection prospects, based on the iterative identification and subtraction of bright sources with respect to both instrument and confusion noise. We also confirm earlier estimates for the confusion-noise foreground, except in one scenario that explains smaller local densities of interacting systems with smaller numbers of progenitor detached systems.

Item Type:Article
Related URLs:
URLURL TypeDescription
Vallisneri, Michele0000-0002-4162-0033
Prince, Thomas A.0000-0002-8850-3627
Additional Information:© 2012 American Astronomical Society. Received 2012 March 2; accepted 2012 July 12; published 2012 October 9. For useful discussions and interactions,we are grateful to Lars Bildsten, Roseanne Di Stefano, Paul Groot, Mukremin Kilic, Shri Kulkarni, David Levitan, Avi Loeb, Sterl Phinney, Tony Piro, and Ken Shen. Part of this work was performed by TAP while at the Aspen Center for Physics, which is supported by NSF grant No. 1066293. G.N. is supported by NWO and FOM. M.V. is grateful for support from the LISA Mission Science Office. Part of this work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Government sponsorship acknowledged. Copyright 2011.
Group:TAPIR, Space Radiation Laboratory
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
LISA Mission Science OfficeUNSPECIFIED
Subject Keywords:binaries: close; Galaxy: general; gravitational waves; methods: data analysis; white dwarfs
Issue or Number:2
Record Number:CaltechAUTHORS:20121207-132844562
Persistent URL:
Official Citation:Gravitational-wave Emission from Compact Galactic Binaries Samaya Nissanke et al. 2012 ApJ 758 131
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35880
Deposited By: Jason Perez
Deposited On:10 Dec 2012 17:15
Last Modified:03 Oct 2019 04:32

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