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Title: A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a

Abstract

The merging neutron star gravitational-wave event GW170817 has been observed throughout the entire electromagnetic spectrum from radio waves to γ -rays. The resulting energetics, variability, and light curves are shown to be consistent with GW170817 originating from the merger of two neutron stars, in all likelihood followed by the prompt gravitational collapse of the massive remnant. The available γ -ray, X-ray, and radio data provide a clear probe for the nature of the relativistic ejecta and the non-thermal processes occurring within, while the ultraviolet, optical, and infrared emission are shown to probe material torn during the merger and subsequently heated by the decay of freshly synthesized r -process material. The simplest hypothesis, that the non-thermal emission is due to a low-luminosity short γ -ray burst (sGRB), seems to agree with the present data. While low-luminosity sGRBs might be common, we show here that the collective prompt and multi-wavelength observations are also consistent with a typical, powerful sGRB seen off-axis. Detailed follow-up observations are thus essential before we can place stringent constraints on the nature of the relativistic ejecta in GW170817.

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]; ; ; ; ;  [4];  [5]
  1. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)
  2. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)
  3. Instituto de Astronomía, Universidad Nacional Autónoma de México, Circuito Exterior, C.U., A. Postal 70-264, 04510 Cd. de México, México (Mexico)
  4. The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)
  5. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
Publication Date:
OSTI Identifier:
22654365
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 848; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC GAMMA BURSTS; DECAY; EMISSION; GAMMA RADIATION; GRAVITATIONAL COLLAPSE; GRAVITATIONAL WAVES; LIMITING VALUES; LUMINOSITY; NEUTRON STARS; R PROCESS; RADIOWAVE RADIATION; RELATIVISTIC RANGE; SIMULATION; SPECTRA; ULTRAVIOLET RADIATION; VISIBLE RADIATION; WAVELENGTHS; X RADIATION

Citation Formats

Murguia-Berthier, A., Ramirez-Ruiz, E., Kilpatrick, C. D., Foley, R. J., Coulter, D. A., Pan, Y.-C., Prochaska, J. X., Rojas-Bravo, C., Siebert, M. R., Kasen, D., Lee, W. H., Piro, A. L., Drout, M. R., Madore, B. F., Shappee, B. J., Simon, J. D., and Rest, A. A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA91B3.
Murguia-Berthier, A., Ramirez-Ruiz, E., Kilpatrick, C. D., Foley, R. J., Coulter, D. A., Pan, Y.-C., Prochaska, J. X., Rojas-Bravo, C., Siebert, M. R., Kasen, D., Lee, W. H., Piro, A. L., Drout, M. R., Madore, B. F., Shappee, B. J., Simon, J. D., & Rest, A. A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a. United States. doi:10.3847/2041-8213/AA91B3.
Murguia-Berthier, A., Ramirez-Ruiz, E., Kilpatrick, C. D., Foley, R. J., Coulter, D. A., Pan, Y.-C., Prochaska, J. X., Rojas-Bravo, C., Siebert, M. R., Kasen, D., Lee, W. H., Piro, A. L., Drout, M. R., Madore, B. F., Shappee, B. J., Simon, J. D., and Rest, A. Fri . "A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a". United States. doi:10.3847/2041-8213/AA91B3.
@article{osti_22654365,
title = {A Neutron Star Binary Merger Model for GW170817/GRB 170817A/SSS17a},
author = {Murguia-Berthier, A. and Ramirez-Ruiz, E. and Kilpatrick, C. D. and Foley, R. J. and Coulter, D. A. and Pan, Y.-C. and Prochaska, J. X. and Rojas-Bravo, C. and Siebert, M. R. and Kasen, D. and Lee, W. H. and Piro, A. L. and Drout, M. R. and Madore, B. F. and Shappee, B. J. and Simon, J. D. and Rest, A.},
abstractNote = {The merging neutron star gravitational-wave event GW170817 has been observed throughout the entire electromagnetic spectrum from radio waves to γ -rays. The resulting energetics, variability, and light curves are shown to be consistent with GW170817 originating from the merger of two neutron stars, in all likelihood followed by the prompt gravitational collapse of the massive remnant. The available γ -ray, X-ray, and radio data provide a clear probe for the nature of the relativistic ejecta and the non-thermal processes occurring within, while the ultraviolet, optical, and infrared emission are shown to probe material torn during the merger and subsequently heated by the decay of freshly synthesized r -process material. The simplest hypothesis, that the non-thermal emission is due to a low-luminosity short γ -ray burst (sGRB), seems to agree with the present data. While low-luminosity sGRBs might be common, we show here that the collective prompt and multi-wavelength observations are also consistent with a typical, powerful sGRB seen off-axis. Detailed follow-up observations are thus essential before we can place stringent constraints on the nature of the relativistic ejecta in GW170817.},
doi = {10.3847/2041-8213/AA91B3},
journal = {Astrophysical Journal Letters},
number = 2,
volume = 848,
place = {United States},
year = {Fri Oct 20 00:00:00 EDT 2017},
month = {Fri Oct 20 00:00:00 EDT 2017}
}