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dc.contributor.author Nicholl, M.
dc.contributor.author Berger, E.
dc.contributor.author Kasen, D.
dc.contributor.author Metzger, B. D.
dc.contributor.author Elias, J.
dc.contributor.author Briceño, C.
dc.contributor.author Alexander, K. D.
dc.contributor.author Blanchard, P. K.
dc.contributor.author Chornock, R.
dc.contributor.author Cowperthwaite, P. S.
dc.contributor.author Eftekhari, T.
dc.contributor.author Fong, W.
dc.contributor.author Margutti, R.
dc.contributor.author Villar, V. A.
dc.contributor.author Williams, P. K. G.
dc.contributor.author Brown, W.
dc.contributor.author Annis, J.
dc.contributor.author Bahramian, A.
dc.contributor.author Brout, D.
dc.contributor.author Brown, D. A.
dc.contributor.author Chen, H. Y.
dc.contributor.author Clemens, J.C.
dc.contributor.author Dennihy, E.
dc.contributor.author Dunlap, B.
dc.contributor.author Holz, D.E.
dc.contributor.author Marchesini, Ezequiel Joaquín
dc.contributor.author Massaro, F.
dc.contributor.author Moskowitz, N.
dc.contributor.author Pelisoli, I.
dc.contributor.author Rest, A.
dc.contributor.author Ricci, F.
dc.contributor.author Sako, M.
dc.contributor.author Soares Santos, M.
dc.contributor.author Strader, J.
dc.date.available 2018-08-23T19:51:33Z
dc.date.issued 2017-10
dc.identifier.citation Nicholl, M.; Berger, E.; Kasen, D.; Metzger, B. D.; Elias, J.; et al.; The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. III. Optical and UV Spectra of a Blue Kilonova from Fast Polar Ejecta; Institute of Physics Publishing; Astrophysical Journal Letters; 848; 2; 10-2017; 1-8
dc.identifier.issn 2041-8213
dc.identifier.uri http://hdl.handle.net/11336/56893
dc.description.abstract We present optical and ultraviolet spectra of the first electromagnetic counterpart to a gravitational-wave (GW) source, the binary neutron star merger GW170817. Spectra were obtained nightly between 1.5 and 9.5 days post-merger, using the Southern Astrophysical Research and Magellan telescopes; the UV spectrum was obtained with the Hubble Space Telescope at 5.5 days. Our data reveal a rapidly fading blue component (T ≈ 5500 K at 1.5 days) that quickly reddens; spectra later than ≳4.5 days peak beyond the optical regime. The spectra are mostly featureless, although we identify a possible weak emission line at ∼7900 Å; at t ≲ 4.5 days. The colors, rapid evolution, and featureless spectrum are consistent with a "blue" kilonova from polar ejecta comprised mainly of light r-process nuclei with atomic mass number A ≲ 140. This indicates a sightline within θobs ≲ 45° of the orbital axis. Comparison to models suggests ∼0.03 M o of blue ejecta, with a velocity of . The required lanthanide fraction is ∼10-4, but this drops to <10-5in the outermost ejecta. The large velocities point to a dynamical origin, rather than a disk wind, for this blue component, suggesting that both binary constituents are neutron stars (as opposed to a binary consisting of a neutron star and a black hole). For dynamical ejecta, the high mass favors a small neutron star radius of ≲12 km. This mass also supports the idea that neutron star mergers are a major contributor to r-process nucleosynthesis.
dc.format application/pdf
dc.language.iso eng
dc.publisher Institute of Physics Publishing
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject BINARIES: CLOSE
dc.subject GRAVITATIONAL WAVES
dc.subject NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES
dc.subject STARS: NEUTRON
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. III. Optical and UV Spectra of a Blue Kilonova from Fast Polar Ejecta
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-06-25T16:16:07Z
dc.journal.volume 848
dc.journal.number 2
dc.journal.pagination 1-8
dc.journal.pais Reino Unido
dc.journal.ciudad Bristol
dc.description.fil Fil: Nicholl, M.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Berger, E.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Kasen, D.. Lawrence Berkeley National Laboratory; Estados Unidos. University of California at Berkeley; Estados Unidos
dc.description.fil Fil: Metzger, B. D.. Columbia University In The City Of New York; Estados Unidos
dc.description.fil Fil: Elias, J.. Southern Astrophysical Research Telescope; Chile
dc.description.fil Fil: Briceño, C.. Cerro Tololo Inter American Observatory; Chile
dc.description.fil Fil: Alexander, K. D.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Blanchard, P. K.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Chornock, R.. Ohio University; Estados Unidos
dc.description.fil Fil: Cowperthwaite, P. S.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Eftekhari, T.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Fong, W.. Northwestern University; Estados Unidos
dc.description.fil Fil: Margutti, R.. Northwestern University; Estados Unidos
dc.description.fil Fil: Villar, V. A.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Williams, P. K. G.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Brown, W.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Annis, J.. Fermi National Accelerator Laboratory; Estados Unidos
dc.description.fil Fil: Bahramian, A.. Michigan State University; Estados Unidos
dc.description.fil Fil: Brout, D.. University of Pennsylvania; Estados Unidos
dc.description.fil Fil: Brown, D. A.. Syracuse University; Estados Unidos
dc.description.fil Fil: Chen, H. Y.. University of Chicago; Estados Unidos
dc.description.fil Fil: Clemens, J.C.. University of North Carolina; Estados Unidos
dc.description.fil Fil: Dennihy, E.. University of North Carolina; Estados Unidos
dc.description.fil Fil: Dunlap, B.. University of North Carolina; Estados Unidos
dc.description.fil Fil: Holz, D.E.. University of Chicago; Estados Unidos
dc.description.fil Fil: Marchesini, Ezequiel Joaquín. Inaf Istituto Di Astrofisica Spaziale E Fisica Cosmica; Italia. Istituto Nazionale Di Fisica Nucleare; Italia. Università di Torino; Italia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física de Líquidos y Sistemas Biológicos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física de Líquidos y Sistemas Biológicos; Argentina
dc.description.fil Fil: Massaro, F.. Istituto Nazionale Di Fisica Nucleare; Italia. Istituto Nazionale Di Astrofisica; Italia. Università di Torino; Italia
dc.description.fil Fil: Moskowitz, N.. Lowell Observatory; Estados Unidos
dc.description.fil Fil: Pelisoli, I.. Universidade Federal do Rio Grande do Sul; Brasil. University of Warwick; Reino Unido
dc.description.fil Fil: Rest, A.. Space Telescope Science Institute; Estados Unidos. University Johns Hopkins; Estados Unidos
dc.description.fil Fil: Ricci, F.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos. Universita Degli Studi Roma Tre; Italia
dc.description.fil Fil: Sako, M.. University of Pennsylvania; Estados Unidos
dc.description.fil Fil: Soares Santos, M.. Fermi National Accelerator Laboratory; Estados Unidos. Brandeis University; Estados Unidos
dc.description.fil Fil: Strader, J.. Michigan State University; Estados Unidos
dc.journal.title Astrophysical Journal Letters
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.3847/2041-8213/aa9029
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.3847/2041-8213/aa9029/meta
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