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Type: Artigo
Title: The electromagnetic counterpart of the binary neutron star merger LIGO/Virgo GW170817. II. UV, optical, and near-infrared light curves and comparison to kilonova models
Author: Cowperthwaite, P. S.
Berger, E.
Villar, V. A.
Metzger, B. D.
Nicholl, M.
Chornock, R.
Blanchard, P. K.
Fong, W.
Margutti, R.
Soares-Santos, M.
Alexander, K. D.
Allam, S.
Annis, J.
Brout, D.
Brown, D. A.
Butler, R. E.
Chen, H. Y.
Diehl, H. T.
Doctor, Z.
Drout, M. R.
Eftekhari, T.
Farr, B.
Finley, D. A.
Foley, R. J.
Frieman, J. A.
Fryer, C. L.
Garcia-Bellido, J.
Gill, M. S. S.
Guillochon, J.
Herner, K.
Holz, D. E.
Kasen, D.
Kessler, R.
Marriner, J.
Matheson, T.
Neilsen, E. H.
Quataert, E.
Palmese, A.
Rest, A.
Sako, M.
Scolnic, D. M.
Smith, N.
Tucker, D. L.
Williams, P. K. G.
Balbinot, E.
Carlin, J. L.
Cook, E. R.
Durret, F.
Li, T. S.
Lopes, P. A. A.
Lourenco, A. C. C.
Marshall, J. L.
Medina, G. E.
Muir, J.
Munoz, R. R.
Sauseda, M.
Schlegel, D. J.
Secco, L. F.
Vivas, A. K.
Wester, W.
Zenteno, A.
Zhang, Y.
Abbott, T. M. C.
Banerji, M.
Bechtol, K.
Benoit-Levy, A.
Bertin, E.
Buckley-Geer, E.
Burke, D. L.
Capozzi, D.
Rosell, A. C.
Kind, M. C.
Castander, F. J.
Crocce, M.
Cunha, C. E.
D'Andrea, C. B.
da Costa, L. N.
Davis, C.
DePoy, D. L.
Desai, S.
Dietrich, J. P.
Drlica-Wagner, A.
Eifler, T. F.
Evrard, A. E.
Fernandez, E.
Flaugher, B.
Fosalba, P.
Gaztanaga, E.
Gerdes, D. W.
Giannantonio, T.
Goldstein, D. A.
Gruen, D.
Gruendl, R. A.
Gutierrez, G.
Honscheid, K.
Jain, B.
James, D. J.
Jeltema, T.
Johnson, M. W. G.
Johnson, M. D.
Kent, S.
Krause, E.
Kron, R.
Kuehn, K.
Nuropatkin, N.
Lahav, O.
Lima, M.
Lin, H.
Maia, M. A. G.
March, M.
Martini, P.
McMahon, R. G.
Menanteau, F.
Miller, C. J.
Miquel, R.
Mohr, J. J.
Neilsen, E.
Nichol, R. C.
Ogando, R. L. C.
Plazas, A. A.
Roe, N.
Romer, A. K.
Roodman, A.
Rykoff, E. S.
Sanchez, E.
Scarpine, V.
Schindler, R.
Schubnell, M.
Sevilla-Noarbe, I.
Smith, M.
Smith, R. C.
Sobreira, F.
Suchyta, E.
Swanson, M. E. C.
Tarle, G.
Thomas, D.
Thomas, R. C.
Troxel, M. A.
Vikram, V.
Walker, A. R.
Wechsler, R. H.
Weller, J.
Yanny, B.
Zuntz, J.
Abstract: We present UV, optical, and near-infrared (NIR) photometry of the first electromagnetic counterpart to a gravitational wave source from Advanced Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo, the binary neutron star merger GW170817. Our data set extends from the discovery of the optical counterpart at 0.47-18.5 days post-merger, and includes observations with the Dark Energy Camera (DECam), Gemini-South/ FLAMINGOS-2 (GS/F2), and the Hubble Space Telescope (HST). The spectral energy distribution (SED) inferred from this photometry at 0.6 days is well described by a blackbody model with T approximate to 8300 K, a radius of R approximate to 4.5 x 10(14) cm (corresponding to an expansion velocity of v approximate to 0.3c), and a bolometric luminosity of L-bol approximate to 5 x 10(41) erg s(-1). At 1.5 days we find a multi-component SED across the optical and NIR, and subsequently we observe rapid fading in the UV and blue optical bands and significant reddening of the optical/ NIR colors. Modeling the entire data set, we find that models with heating from radioactive decay of Ni-56, or those with only a single component of opacity from r-process elements, fail to capture the rapid optical decline and red optical/NIR colors. Instead, models with two components consistent with lanthanide-poor and lanthanide-rich ejecta provide a good fit to the data; the resulting "blue" component has M-ej(blue) approximate to 0.01 M-circle dot and v(ej)(blue) approximate to 0.3c, and the "red" component has M-cj(red) approximate to 0.04 M-circle dot and v(cj)(red) approximate to 0.1 c. These ejecta masses are broadly consistent with the estimated r-process production rate required to explain the Milky Way r-process abundances, providing the first evidence that binary neutron star (BNS) mergers can be a dominant site of r-process enrichment.
Subject: Catálogos
Ondas gravitacionais
Estrelas de nêutrons
Gravitational waves
Neutron stars
Country: Reino Unido
Editor: Institute of Physics Publishing
Rights: aberto
Identifier DOI: 10.3847/2041-8213/aa8fc7
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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