scholarly journals Systematic effects from black hole-neutron star waveform model uncertainties on the neutron star equation of state

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
Kabir Chakravarti ◽  
Anuradha Gupta ◽  
Sukanta Bose ◽  
Matthew D. Duez ◽  
Jesus Caro ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Model Uncertainties ◽  
Systematic Effects

scholarly journals Extracting equation of state parameters from black hole-neutron star mergers: Aligned-spin black holes and a preliminary waveform model

2014 ◽  
Vol 89 (4) ◽  
Author(s):  
Benjamin D. Lackey ◽  
Koutarou Kyutoku ◽  
Masaru Shibata ◽  
Patrick R. Brady ◽  
John L. Friedman
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Star ◽  
Equation Of State

scholarly journals Extracting Equation of State Parameters from Black Hole-Neutron Star Mergers

2011 ◽  
Vol 0 (0) ◽  
Author(s):  
Benjamin D. Lackey ◽  
Koutarou Kyutoku ◽  
Masaru Shibata ◽  
Patrick R. Brady ◽  
John L. Friedman
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State

scholarly journals Black hole-neutron star binary merger: Dependence on black hole spin orientation and equation of state

2015 ◽  
Vol 92 (2) ◽  
Author(s):  
Kyohei Kawaguchi ◽  
Koutarou Kyutoku ◽  
Hiroyuki Nakano ◽  
Hirotada Okawa ◽  
Masaru Shibata ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Spin Orientation ◽  
Black Hole Spin ◽  
Star Binary

scholarly journals Probing the Nuclear Equation of State from the Existence of a ∼2.6 M⊙ Neutron Star: The GW190814 Puzzle

Symmetry ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 183
Author(s):  
Alkiviadis Kanakis-Pegios ◽  
Polychronis S. Koliogiannis ◽  
Charalampos C. Moustakidis
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Speed Of Sound ◽  
Compact Object ◽  
Dense Matter ◽  
High Mass ◽  
Nuclear Equation Of State ◽  
Dense Nuclear Matter ◽  
Low Mass

On 14 August 2019, the LIGO/Virgo collaboration observed a compact object with mass ∼2.59−0.09+0.08M⊙, as a component of a system where the main companion was a black hole with mass ∼23M⊙. A scientific debate initiated concerning the identification of the low mass component, as it falls into the neutron star–black hole mass gap. The understanding of the nature of GW190814 event will offer rich information concerning open issues, the speed of sound and the possible phase transition into other degrees of freedom. In the present work, we made an effort to probe the nuclear equation of state along with the GW190814 event. Firstly, we examine possible constraints on the nuclear equation of state inferred from the consideration that the low mass companion is a slow or rapidly rotating neutron star. In this case, the role of the upper bounds on the speed of sound is revealed, in connection with the dense nuclear matter properties. Secondly, we systematically study the tidal deformability of a possible high mass candidate existing as an individual star or as a component one in a binary neutron star system. As the tidal deformability and radius are quantities very sensitive on the neutron star equation of state, they are excellent counters on dense matter properties. We conjecture that similar isolated neutron stars or systems may exist in the universe and their possible future observation will shed light on the maximum neutron star mass problem.

scholarly journals Black-hole–Neutron-star Mergers Are Unlikely Multimessenger Sources

2021 ◽  
Vol 923 (1) ◽  
pp. L2
Author(s):  
Giacomo Fragione
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Gravitational Wave ◽  
Internal Structure ◽  
Binary Stars ◽  
Statistical Study ◽  
Gamma Ray ◽  
High Rate ◽  
Upper Limit

Abstract The promise by the LIGO/Virgo/Kagra (LVK) collaboration to detect black-hole–neutron-star (BH–NS) mergers via gravitational wave (GW) emission has recently been fulfilled with the detection of GW200105 and GW200115. Mergers of BH–NS binaries are particularly exciting for their multimessenger potential since GW detection can be followed by an electromagnetic (EM) counterpart (kilonova, gamma-ray burst, afterglow) that can reveal important information on the equation of state (EOS) of NSs and the nature of the BH spin. This can happen whenever the NS does not directly plunge into the BH, but rather is tidally disrupted, leaving behind debris to accrete. We carry out a statistical study of the binary stars that evolve to form a BH–NS binary and compute the rate of merger events that can be followed by an EM counterpart. We find that ≳50% of the mergers can lead to an EM counterpart only in the case where BHs are born highly spinning (χ BH ≳ 0.7), while this fraction does not exceed about 30% for stiff NS EOSs and a few percent for soft NS EOSs for low-spinning BHs (χ BH ≲ 0.2), suggesting that a high rate of EM counterparts of BH–NS would provide support for high natal BH spins. However, the possibilities that BHs are born with near-maximal spins and that NS internal structure is described by a stiff EOS are disfavored by current LVK constraints. Considering that these values only represent an upper limit to observe an EM counterpart due to current observational limitations, such as brightness sensitivity and sky localization, BH–NS mergers are unlikely multimessenger sources.

scholarly journals Black-hole–neutron-star mergers at realistic mass ratios: Equation of state and spin orientation effects

2013 ◽  
Vol 87 (8) ◽  
Author(s):  
Francois Foucart ◽  
M. Brett Deaton ◽  
Matthew D. Duez ◽  
Lawrence E. Kidder ◽  
Ilana MacDonald ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Spin Orientation ◽  
Orientation Effects ◽  
Mass Ratios

scholarly journals Dynamical ejecta from precessing neutron star-black hole mergers with a hot, nuclear-theory based equation of state

2017 ◽  
Vol 34 (4) ◽  
pp. 044002 ◽  
Author(s):  
F Foucart ◽  
D Desai ◽  
W Brege ◽  
M D Duez ◽  
D Kasen ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Nuclear Theory

scholarly journals Extracting equation of state parameters from black hole-neutron star mergers: Nonspinning black holes

2012 ◽  
Vol 85 (4) ◽  
Author(s):  
Benjamin D. Lackey ◽  
Koutarou Kyutoku ◽  
Masaru Shibata ◽  
Patrick R. Brady ◽  
John L. Friedman
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Neutron Star ◽  
Equation Of State

scholarly journals Neutron star-black hole mergers with a nuclear equation of state and neutrino cooling: Dependence in the binary parameters

2014 ◽  
Vol 90 (2) ◽  
Author(s):  
Francois Foucart ◽  
M. Brett Deaton ◽  
Matthew D. Duez ◽  
Evan O’Connor ◽  
Christian D. Ott ◽  
...  
Keyword(s):  
Black Hole ◽  
Neutron Star ◽  
Equation Of State ◽  
Nuclear Equation Of State
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