Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-23T06:45:52.707Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Abbott, B. P., Abbott, R., Abbott, T. D., et al. Nature, 551:85–88, 2017Google Scholar
Abbott, B. P., Abbott, R., Abbott, T. D., et al. Physical Review Letters, 119 (16):161101, 2017Google Scholar
Abbott, B. P., Abbott, R., Abbott, T. D., et al. Astrophysical Journal Letters, 848:L12, 2017Google Scholar
Abbott, B. P., Abbott, R., Abbott, T. D., et al. Astrophysical Journal Letters, 848:L13, 2017Google Scholar
Alexander, K. D., Berger, E., Fong, , et al. Astrophysical Journal Letters, 848:L21, 2017Google Scholar
Allam, S., Annis, J., Berger, E., et al. GCN 21530, 2017Google Scholar
Annis, J., Soares-Santos, M., Berger, E., et al. Astrophysical Journal Letters, 823:L34, 2017Google Scholar
Barnes, J., & Kasen, D. Astrophysical Journal, 775:18, 2013.Google Scholar
Berger, E., Annual Reviews of Astronomy and Astrophysics, 52, 43, 2014.Google Scholar
Blanchard, P. K., Berger, E., Fong, , et al. Astrophysical Journal Letters, 848:L22, 2017Google Scholar
Chornock, R., Berger, E., Kasen, D., et al. Astrophysical Journal Letters, 848:L19, 2017Google Scholar
Cowperthwaite, P. S., et al. Astrophysical Journal Letters, 826:L29, 2016Google Scholar
Flaugher, B., Diehl, H. T., et al., and DES Collaboration. Astronomcial Journal, 150:150, 2015.Google Scholar
Fong, W., Berger, E., Blanchard, P. K., et al. Astrophysical Journal Letters, 848:L23, 2017Google Scholar
Guidorzi, C., Margutti, R., Brout, D, et al. ArXiv e-prints, October 2017.Google Scholar
Holz, D. E., & Hughes, S. A. Astrophysical Journal, 629:15, 2005.Google Scholar
Hotokezaka, K., Kiuchi, K., Kyutoku, K., et al. Physical Review D, 87:024001, 2013.Google Scholar
Kasen, D., Metzger, B., Barnes, J., et al. Nature, 551:80–84, November 2017.Google Scholar
Kasen, D., Badnell, N. R., & Barnes, J. Astrophysical Journal, 774:25, 2013.Google Scholar
Margutti, R., Berger, E., Fong, W., et al. Astrophysical Journal Letters, 848:L20, 2017Google Scholar
Metzger, B. D., & Berger, E. Astrophysical Journal, 746:48, 2016.Google Scholar
Nicholl, M., Berger, E., Kasen, D., et al. Astrophysical Journal Letters, 848:L18, 2017Google Scholar
Palmese, A., Hartley, W., Tarsitano, et al. Astrophysical Journal Letters, 849:L34, 2017Google Scholar
Schutz, B. F. Nature, 323:310, 1986.Google Scholar
Soares-Santos, M., Kessler, R., Berger, E., et al. Astrophysical Journal Letters, 823:L33, 2016Google Scholar
Soares-Santos, M., Holz, D. E., Annis, J., et al. Astrophysical Journal Letters, 848:L16, 2017Google Scholar
Tanaka, M., Utsumi, Y., Mazzali, P. A., et al. ArXiv e-prints, October 2017.Google Scholar