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Title: The Emergence of a Lanthanide-rich Kilonova Following the Merger of Two Neutron Stars

Journal Article · · The Astrophysical Journal. Letters (Online)
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  1. Univ. of Leicester (United Kingdom)
  2. Univ. of Warwick, Coventry (United Kingdom)
  3. Univ. of Cambridge (United Kingdom)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Birmingham (United Kingdom)
  6. Stockholm Univ. (Sweden)
  7. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  8. National Inst. for Astrophysics (INAF), Merate (Italy)
  9. Space Telescope Science Inst., Baltimore, MD (United States)
  10. Astrophysical Inst. of Andalusia, Granada (Spain)
  11. Liverpool John Moores Univ. (United Kingdom)
  12. Space Science Data Center, Rome (Italy); National Inst. for Astrophysics (INAF), Cantone (Italy)
  13. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Astrophysical Inst. of Andalusia, Granada (Spain)
  14. Cardiff Univ. (United Kingdom)
  15. Univ. of St. Andrews, Scotland (United Kingdom)
  16. Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Nagoya Univ. (Japan)
  17. Max Planck Inst. for Extraterrestrial Physics, Garching (Germany)
  18. Univ. of Iceland, Reykjavik (Iceland)
  19. National Inst. for Astrophysics (INAF), Bologna (Italy)
  20. National Inst. for Astrophysics (INAF), Catone (Italy)
  21. Pontifical Catholic Univ. of Chile, Santiago (Chile)
  22. Monash Univ., Melbourne, VIC (Australia)
  23. Univ. of Amsterdam (Netherlands); Netherlands Inst. for Radio Astronomy, Dwingeloo (Netherlands)
  24. Weizmann Inst. of Science, Rehovot (Israel)
  25. Univ. of Amsterdam (Netherlands)

Here, we report the discovery and monitoring of the near-infrared counterpart (AT2017gfo) of a binary neutron-star merger event detected as a gravitational wave source by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo (GW170817) and as a short gamma-ray burst by Fermi Gamma-ray Burst Monitor (GBM) and Integral SPI-ACS (GRB 170817A). The evolution of the transient light is consistent with predictions for the behavior of a "kilonova/macronova" powered by the radioactive decay of massive neutron-rich nuclides created via r-process nucleosynthesis in the neutron-star ejecta. In particular, evidence for this scenario is found from broad features seen in Hubble Space Telescope infrared spectroscopy, similar to those predicted for lanthanide-dominated ejecta, and the much slower evolution in the near-infrared $${K}_{{\rm{s}}}$$-band compared to the optical. This indicates that the late-time light is dominated by high-opacity lanthanide-rich ejecta, suggesting nucleosynthesis to the third r-process peak (atomic masses $$A\approx 195$$). This discovery thus confirms that neutron-star mergers produce kilo-/macronovae and that they are at least a major—if not the dominant—site of rapid neutron capture nucleosynthesis in the universe.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1407907
Report Number(s):
LA-UR-17-29025; TRN: US1702928
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 848, Issue 2; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 376 works
Citation information provided by
Web of Science

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The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo journal November 2018
Web application for galaxy-targeted follow-up of electromagnetic counterparts to gravitational wave sources journal January 2020
Spectral classification of gravitational-wave emission and equation of state constraints in binary neutron star mergers journal September 2019
A Strategy for LSST to Unveil a Population of Kilonovae without Gravitational-wave Triggers journal May 2019
Disc formation in the collapse of supramassive neutron stars journal August 2018
Long-lived remnants from binary neutron star mergers journal September 2018
A lesson from GW170817: most neutron star mergers result in tightly collimated successful GRB jets journal November 2018
Transient survey rates for orphan afterglows from compact merger jets journal February 2018
Detectability of neutron star merger afterglows journal July 2019
An unusual transient following the short GRB 071227 journal July 2019
possis: predicting spectra, light curves, and polarization for multidimensional models of supernovae and kilonovae journal September 2019
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A multidimensional implementation of the Advanced Spectral neutrino Leakage scheme journal October 2019
Non-thermal afterglow of the binary neutron star merger GW170817: a more natural modelling of electron energy distribution leads to a qualitatively different new solution journal February 2019
A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015 journal February 2019
A new delay time distribution for merging neutron stars tested against Galactic and cosmic data journal April 2019
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A Magnetar Origin for the Kilonova Ejecta in GW170817 journal March 2018
Shock Acceleration of Electrons and Synchrotron Emission from the Dynamical Ejecta of Neutron Star Mergers journal May 2018
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On the Origin of Early Solar System Radioactivities: Problems with the Asymptotic Giant Branch and Massive Star Scenarios journal August 2018
The R -Process Alliance: A Comprehensive Abundance Analysis of HD 222925, a Metal-poor Star with an Extreme R -process Enhancement of [Eu/H] = −0.14 journal October 2018
Low-frequency View of GW170817/GRB 170817A with the Giant Metrewave Radio Telescope journal October 2018
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Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts, and Nucleosynthesis journal December 2018
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The Lanthanide Fraction Distribution in Metal-poor Stars: A Test of Neutron Star Mergers as the Dominant r -process Site journal August 2019
Short GRB 160821B: A Reverse Shock, a Refreshed Shock, and a Well-sampled Kilonova journal September 2019
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  • Collaboration, LIGO Scientific; Collaboration,, 1m2h; Collaboration, Dark Energy Camera GW-EM
  • Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.31821
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AT2017gfo: an anisotropic and three-component kilonova counterpart of GW170817 text January 2017
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Spitzer Space Telescope Infrared Observations of the Binary Neutron Star Merger GW170817 text January 2018
Californium-254 and kilonova light curves text January 2018
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Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts and Nucleosynthesis text January 2018
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Multimessenger Parameter Estimation of GW170817 text January 2018
Presto-Color: A Photometric Survey Cadence for Explosive Physics & Fast Transients text January 2018
A new delay time distribution for merging neutron stars tested against Galactic and cosmic data text January 2019
GW170817$-$the first observed neutron star merger and its kilonova: implications for the astrophysical site of the r-process text January 2019
Late time kilonova light curves and implications to GW 170817 text January 2019
From the microscopic to the macroscopic world: from nucleons to neutron stars text January 2019
A Pulsar Wind Nebula Embedded in the Kilonova AT2017gfo Associated with GW 170817/GRB 170817A text January 2019
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Neutron star binary orbits in their host potential: effect on early r-process enrichment text January 2019
POSSIS: predicting spectra, light curves and polarization for multi-dimensional models of supernovae and kilonovae text January 2019
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