Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Q16: Neutron Star Merger Outflows and Prospects for Observing Them
10:45 AM–12:21 PM,
Monday, April 15, 2019
Sheraton Room: Grand Ballroom I
Sponsoring Units: DAP DGRAV
Chair: Carolyn Raithel, University of Arizona
Abstract: Q16.00002 : Viewing angle of binary neutron star mergers*
10:57 AM–11:09 AM
View Presentation Abstract
(Massachusetts Institute of Technology)
(Harvard - Smithsonian Center for Astrophysics)
The joint detection of the gravitational wave (GW) GW170817 and its electromagnetic (EM) counterparts has triggered extensive study of the EM emission of binary neutron star mergers (BNSs).
A parameter which is common to and plays a key role in both the GW and the EM analyses is the viewing angle of the binary's orbit. If a binary is viewed from different angles, the amount of GW energy changes and the EM signatures can vary. Information about the viewing angle of the binary orbital plane is therefore crucial to the interpretation of both the GW and the EM data, and can potentially be extracted from either side. In this talk I will present a systematic analysis of how well the viewing angle of BNSs can be measured from the GW data. Then, we consider a case where some constraints on the viewing angle can be placed from the EM data itself. We show that the EM measurements can then be used in the analysis of GW data to improve the precision of the luminosity distance, and hence of the Hubble constant.
*The authors acknowledge the support of the Black Hole Initiative at Harvard University through a grant from the John Templeton Foundation, the MIT physics department through the Solomon Buchsbaum Research Fund, and the NSF grant PHY-0757058/AST1312651.
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