2020MNRAS.496L..16M -
Mon. Not. R. Astron. Soc., 496, L16-L21 (2020/July-3)
The heavier the better: how to constrain mass ratios and spins of high-mass neutron star mergers.
MOST E.R., WEIH L.R. and REZZOLLA L.
Abstract (from CDS):
The first binary neutron star merger event, GW170817, and its bright electromagnetic counterpart have provided a remarkable amount of information. By contrast, the second event, GW190425, with M_ tot=3.4+0.3^–0.1 M☉ and the lack of an electromagnetic counterpart, has hardly improved our understanding of neutron star physics. While GW190425 is compatible with a scenario in which the merger has led to a prompt collapse to a black hole and little ejected matter to power a counterpart, determining the mass ratio and the effective spin ∼χof the binary remains difficult. This is because gravitational waveforms cannot yet well constrain the component spins of the binary. However, since the mass of GW190425 is significantly larger than the maximum mass for non-rotating neutron stars, MTOV, the mass ratio q cannot be too small, as the heavier star would not be gravitationally stable. Making use of universal relations and a large number of equations of state, we provide limits in the (∼χ,q) plane for GW190425, namely qmin >= 0.38 and ∼χmax≤0.20, assuming Mtot ≃3.4 M☉. Finally, we show how future observations of high-mass binaries can provide a lower bound on MTOV.
Abstract Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
neutron star mergers - gravitational waves - stars: neutron
Simbad objects:
2
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