APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019;
Denver, Colorado
Session R05: Detection and Modeling of Binary Neutron-Star Collisions
Invited Session
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Sponsoring Units: DNP DGRAV
Chair: Tonia Venters, NASA GSFC
Room: Sheraton Governor's Square 14
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Monday, April 15, 2019
1:30PM - 2:06PM
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R05.00001: Neutron rich dense matter, neutron star mergers, and laboratory experiments
Invited Speaker:
Charles J Horowitz
I review gravitational wave and E+M observations of the neutron star merger GW170817 and discuss what we are learning about dense neutron rich matter and the origin of the heavy elements. Equation of state (pressure versus density) constraints from these gravitational wave observations are compared to constraints from the Jefferson Laboratory PREX and CREX experiments. These experiments also probe neutron rich matter by measuring the neutron skins of the nuclei 208Pb and 48Ca. |
Monday, April 15, 2019
2:06PM - 2:42PM
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R05.00002: The astrophysics of compact object mergers with gravitational wave and electromagnetic emission
Invited Speaker:
Samaya Nissanke
On August 17th 2017, the LIGO and Virgo gravitational wave detectors discovered the first binary neutron star merger GW170817. The FERMI gamma-ray monitor independently detected a gamma-ray burst within 2 seconds with respect to the merger. Instigated by the event’s gravitational wave localization volume, telescopes across all wavebands in the electromagnetic spectrum observed the ensuing event’s post-merger emission.
In this talk, I will first describe the gravitational wave observations of this binary neutron star and then discuss how to place compact object mergers in their full astrophysical context with joint gravitational wave and electromagnetic observations. I will highlight the challenges we face in explaining the rich physics driving the merger in high velocity, strongly-curved spacetimes in Universe. I will conclude with the unprecedented opportunities that are opening up in strong-field dynamic gravity astrophysics thanks to multi-messenger astrophysics during the coming years. |
Monday, April 15, 2019
2:42PM - 3:18PM
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R05.00003: The Discovery, Follow-up, and Implications of Electromagnetic Counterparts to BNS Mergers
Invited Speaker:
Maria R. Drout
On August 17th, 2017, the field of multi-messenger, gravitational-wave, astronomy was born. On this date, Advanced LIGO and Advanced Virgo observed gravitational waves from the coalescence of a neutron star binary with a false alarm probability of 1 per 10000 years and counterparts were subsequently identified across the entire electromagnetic spectrum. Now, in April 2019, LIGO/Virgo Observing Run 3 will commence, with the expectation of many more multi-messenger detections. In this talk, I will give a broad review of the electromagnetic emission associated with the the binary neutron star (BNS) merger, GW170817. I will describe the process of the discovery and localization of the counterparts, review the extensive follow-up observations obtained, and place these observations in context. I will discuss the implications of these observations on our understanding of topics ranging from the ejecta from neutron star mergers and the origin of r-process elements to the nature of gamma-ray bursts. Finally, I will give prospects for LIGO/Virgo O3 and describe how the identification of populations of electromagnetic counterparts to BNS mergers will allow us constrain the neutron star equation of state and the expansion of the universe.
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