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    The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South

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    Chornock_2017_ApJL_848_L19.pdf
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    Author
    Chornock, R.
    Berger, E.
    Kasen, D.
    Cowperthwaite, P. S. cc
    Nicholl, M.
    Villar, V. A.
    Alexander, K. D.
    Blanchard, P. K.
    Eftekhari, T.
    Fong, W.
    Margutti, R.
    Williams, P. K. G.
    Annis, J.
    Brout, D.
    Brown, D. A.
    Chen, H.-Y.
    Drout, M. R.
    Farr, B.
    Foley, R. J.
    Frieman, J. A.
    Fryer, C. L.
    Herner, K.
    Holz, D. E.
    Kessler, R. cc
    Matheson, T.
    Metzger, B. D.
    Quataert, E.
    Rest, A.
    Sako, M.
    Scolnic, D. M.
    Smith, N.
    Soares-Santos, M. cc
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-10-16
    Keywords
    binaries: close
    nuclear reactions, nucleosynthesis, abundances
    stars: neutron
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. IV. Detection of Near-infrared Signatures of r-process Nucleosynthesis with Gemini-South 2017, 848 (2):L19 The Astrophysical Journal
    Journal
    The Astrophysical Journal Letters
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present a near-infrared spectral sequence of the electromagnetic counterpart to the binary neutron star merger GW170817 detected by Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo. Our data set comprises seven epochs of J + H spectra taken with FLAMINGOS-2 on Gemini-South between 1.5 and 10.5 days after the merger. In the initial epoch, the spectrum is dominated by a smooth blue continuum due to a high-velocity, lanthanide-poor blue kilonova component. Starting the following night, all of the subsequent spectra instead show features that are similar to those predicted in model spectra of material with a high concentration of lanthanides, including spectral peaks near 1.07 and 1.55 mu m. Our fiducial model with 0.04 M-circle dot of ejecta, an ejection velocity of v = 0.1c, and a lanthanide concentration of X-lan = 10(-2) provides a good match to the spectra taken in the first five days, although it over-predicts the late-time fluxes. We also explore models with multiple fitting components, in each case finding that a significant abundance of lanthanide elements is necessary to match the broad spectral peaks that we observe starting at 2.5 days after the merger. These data provide direct evidence that binary neutron star mergers are significant production sites of even the heaviest r-process elements.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8213/aa905c
    Version
    Final published version
    Sponsors
    NSF [AST-1411763, AST-1714498, PHY-1707954, AST-1518052]; NASA [NNX15AE50G, NNX16AC22G, NAS 5-26555]; Department of Energy; Office of Energy Research, Office of High Energy and Nuclear Physics, Divisions of Nuclear Physics, of the U.S. Department of Energy [DE-AC02-05CH11231]; Gordon and Betty Moore Foundation [GBMF5076]; Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]; Kavli Foundation; Danish National Research Foundation; Niels Bohr International Academy; DARK Cosmology Centre; Heising-Simons Foundation; Alfred P. Sloan Foundation; David and Lucile Packard Foundation; NASA by Space Telescope Science Institute; [GS-2017B-Q-8]; [GS-2017B-DD-4]; [DE-SC0017616]
    Additional Links
    http://stacks.iop.org/2041-8205/848/i=2/a=L19?key=crossref.6cf144d862d9965dd56eeda47664c236
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/aa905c
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