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Observations of GW170817 by DESGW and the DECam GW-EM Collaboration

Published online by Cambridge University Press:  29 January 2019

James Annis Open the ORCID record for James Annis [Opens in a new window]
James Annis*
Affiliation:
Fermi National Accelerator Laboratory Batavia, Illinois, USA email: annis@fnal.gov
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Abstract

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On August 17, 2017 LIGO/Virgo detected a binary neutron star via gravitational waves. We observed 70 sq-degrees in the LIGO/Virgo spatial localization with the DECam on the 4m Blanco telescope covering 80% of the final map. Our group independently discovered an optical counterpart in NGC 4993. We searched our entire imaged region: the object in NGC 4993 was the only viable candidate. Our observations of NGC4993 show complicated morphology but simple star formation history. Our x-ray and radio observations indicate an off-axis jet as afterglow. Our high-cadence optical and infrared spectra show a source that must be described by at least two components, one of which is dominated by the r-process nucleosynthesis elements characteristic of a kilonova. Our modeling of the light curve demonstrates such a model in which 0.05 M⊙ of material is ejected from the system. Finally, we discuss the first standard siren measurement of H0.

Keywords

gravitational waves(cosmology:) cosmological parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S338: Gravitational Wave Astrophysics: Early Results from Gravitational Wave Searches and Electromagnetic Counterparts , October 2017 , pp. 72 - 79
Copyright
Copyright © International Astronomical Union 2019 

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