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Modeling the Complete Gravitational Wave Spectrum of Neutron Star Mergers

Bernuzzi, Sebastiano and Dietrich, Tim and Nagar, Alessandro (2015) Modeling the Complete Gravitational Wave Spectrum of Neutron Star Mergers. Physical Review Letters, 115 (9). Art. No. 091101. ISSN 0031-9007.

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In the context of neutron star mergers, we study the gravitational wave spectrum of the merger remnant using numerical relativity simulations. Postmerger spectra are characterized by a main peak frequency f_2 related to the particular structure and dynamics of the remnant hot hypermassive neutron star. We show that f_2 is correlated with the tidal coupling constant κ^T_2 that characterizes the binary tidal interactions during the late-inspiral merger. The relation f_2 (κ^T_2) depends very weakly on the binary total mass, mass ratio, equation of state, and thermal effects. This observation opens up the possibility of developing a model of the gravitational spectrum of every merger unifying the late-inspiral and postmerger descriptions.

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Additional Information:© 2015 American Physical Society. Received 9 April 2015; revised manuscript received 11 June 2015; published 27 August 2015. We thank Andreas Bauswein, Bernd Brügmann, Tibault Damour, Sarah Gossan, Tjonnie Li, David Radice, Maximiliano Ujevic, and Loic Villain for comments and discussions. This work was supported in part by the DFG grant SFB/Transregio 7 “Gravitational Wave Astronomy” and the Graduierten-Akademie Jena. S. B. acknowledges partial support from the National Science Foundation under Grants No. NSF AST-1333520, No. PHY-1404569, and No. AST-1205732. T. D. thanks IHES for hospitality during the development of part of this work. Simulations were performed at LRZ (Münich) and at JSC (Jülich).
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)SFB/Transregio 7
Graduierten-Akademie JenaUNSPECIFIED
Issue or Number:9
Classification Code:PACS numbers: 04.25.D-, 04.30.Db, 95.30.Sf
Record Number:CaltechAUTHORS:20150918-135653081
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60334
Deposited By: Tony Diaz
Deposited On:19 Sep 2015 01:23
Last Modified:03 Oct 2019 08:56

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