Effects of hyperons in binary neutron star mergers - INSPIRE

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Effects of hyperons in binary neutron star mergers

Oct, 2011

5 pages

Published in:

Phys.Rev.Lett. 107 (2011) 211101

e-Print:

1110.4442 [astro-ph.HE]

DOI:

10.1103/PhysRevLett.107.211101

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Abstract: (arXiv)

Numerical simulations for the merger of binary neutron stars are performed in full general relativity incorporating both nucleonic and hyperonic finite-temperature equations of state (EOS) and neutrino cooling for the first time. It is found that even for the hyperonic EOS, a hypermassive neutron star is first formed after the merger for the typical total mass

\approx

2.7M\bigodot, and subsequently collapses to a black hole (BH). It is shown that hyperons play a substantial role in the post-merger dynamics, torus formation around the BH, and emission of gravitational waves (GWs). In particular, the existence of hyperons is imprinted in GWs. Therefore, GW observations will provide a potential opportunity to explore the composition of the neutron star matter.

Note:

5 pages, 5 figures, accepted for publication in PRL

04.30.-w
04.25.D-
26.60.Kp
97.60.Jd
neutron star: binary
equation of state: finite temperature
neutron star: matter
hyperon: effect
gravitational radiation: emission
numerical calculations

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