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 MergersInvited
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Sponsoring Units: DAP DNP Chair: Jocelyn Read, Cal State Fullerton Room: Sheraton Plaza F |
Sunday, April 14, 2019 8:30AM - 9:06AM |
G04.00001: Constraints on the Neutron Star Equation of State from GW170817 Invited Speaker: Carolyn Raithel 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.
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Sunday, April 14, 2019 9:06AM - 9:42AM |
G04.00002: Probing Neutron Stars using Gravitational Waves Invited Speaker: Duncan A. Brown The detection of the binary neutron star merger GW170817 by Advanced LIGO and Virgo has allowed us to explore the nature of dense matter using gravitational waves. The gravitational waves radiated during the merger encode the masses, spins, and tidal deformability of the stars. Measuring these quantities allows us to probe the dense matter equation of state. The observation of GW17017 has provided unprecedented insight into the nuclear equation of state. However, despite the high signal-to-noise ratio of GW170817, challenges remain in accurately measuring the star's properties using gravitational waves. I will review what we have learned so far from GW170817 and discuss how future observations with Advanced LIGO/Virgo, or a third-generation detector like Cosmic Explorer, could improve our understanding of the nature of dense matter. |
Sunday, April 14, 2019 9:42AM - 10:18AM |
G04.00003: Multi-messenger constraints on Neutron Stars Invited Speaker: Ben Margalit The first binary neutron star merger detected in gravitational waves, GW170817, was additionally observed across the electromagnetic spectrum in the most ambitious follow-up campaign in the history of astronomy. I will discuss ways in which the electromagnetic counterparts of a binary neutron star merger can provide invaluable insight into the merger remnant's fate. Combined with inferences from the gravitational wave signal, novel constraints can be placed on the equation of state of dense neutron-rich matter, heralding the dawn of multi-messenger science. I will review major successes and lessons from GW170817, and discuss prospects for future multi-messenger observations of binary neutron star mergers. |
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