Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G04: Probing Neutron Stars through Neutron Star Mergers
8:30 AM–10:18 AM,
Sunday, April 14, 2019
Sheraton
Room: Plaza F
Sponsoring
Units:
DAP DNP
Chair: Jocelyn Read, Cal State Fullerton
Abstract: G04.00001 : Constraints on the Neutron Star Equation of State from GW170817*
8:30 AM–9:06 AM
Presenter:
Carolyn Raithel
(University of Arizona)
Authors:
Carolyn Raithel
(University of Arizona)
Feryal Ozel
(University of Arizona)
Dimitrios Psaltis
(University of Arizona)
Observations of neutron stars provide one of the best ways of probing the ultra-dense matter equation of state (EOS). While X-ray measurements of the neutron star radius have provided some promising constraints on the EOS, uncertainties remain at high densities. Detections of gravitational waves from a binary neutron star (BNS) merger offer an exciting, complementary approach to constraining the EOS. In this talk, I will discuss what we have already learned about the EOS from a year of studying the first observed BNS merger, GW170817. In particular, I will explore the surprising relationship that has been discovered between the binary tidal deformability and the radius, which renders GW170817 a direct probe of the neutron star radius. I will compare the radius constraints from GW170817 to existing radii measurements from X-ray observations and discuss the implications for the EOS. I will also review new constraints on the maximum mass that have been inferred from GW170817. Finally, I will comment on the importance of disentangling thermal effects from the cold EOS in future analyses of gravitational waves.
*This work is supported by the NSF Graduate Research Fellowship Program Grant DGE-1143953 as well as NASA grant NNX16AC56G.
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