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Gravitational waves and mass ejecta from binary neutron star mergers: Effect of the spin orientation
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). University of Jena, Germany.
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Number of Authors: 82020 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 102, no 2, article id 024087Article in journal (Refereed) Published
Abstract [en]

We continue our study of the binary neutron star parameter space by investigating the effect of the spin orientation on the dynamics, gravitational wave emission, and mass ejection during the binary neutron star coalescence. We simulate seven different configurations using multiple resolutions to allow a reasonable error assessment. Due to the particular choice of the setups, five configurations show precession effects, from which two show a precession (wobbling) of the orbital plane, while three show a bobbing motion; i.e., the orbital angular momentum does not precess, while the orbital plane moves along the orbital angular momentum axis. Considering the ejection of mass, we find that precessing systems can have an anisotropic mass ejection, which could lead to a final remnant kick of similar to 40 km/s for the studied systems. Furthermore, for the chosen configurations, antialigned spins lead to larger mass ejecta than aligned spins, so that brighter electromagnetic counterparts could be expected for these configurations. Finally, we compare our simulations with the precessing, tidal waveform approximant IMRPhenomPv2_NRTidalv2 and find good agreement between the approximant and our numerical relativity waveforms with phase differences below 1.2 rad accumulated over the last similar to 16 gravitational wave cycles.

Place, publisher, year, edition, pages
2020. Vol. 102, no 2, article id 024087
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-184362DOI: 10.1103/PhysRevD.102.024087ISI: 000553689700002OAI: oai:DiVA.org:su-184362DiVA, id: diva2:1472310
Available from: 2020-10-01 Created: 2020-10-01 Last updated: 2022-02-25Bibliographically approved

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Chaurasia, Swami VivekanandjiFabbri, Francesco Maria

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CiteExportLink to record
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