Details

Autor(en) / Beteiligte

• Chaurasia, Swami Vivekanandji
• Dietrich, Tim
• Ujevic, Maximiliano
• Hendriks, Kai
• Dudi, Reetika
• Fabbri, Francesco Maria
• Tichy, Wolfgang
• Brügmann, Bernd

Titel

Gravitational waves and mass ejecta from binary neutron star mergers: Effect of the spin orientation

Ist Teil von

• Physical review. D, 2020-07, Vol.102 (2), p.1, Article 024087

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 ∼ 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 ∼ 16 gravitational wave cycles.