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

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...

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Autores principales: Nicholl, M., Berger, E., Kasen, D., Metzger, B. D., Elias, J., Briceño, C., Alexander, K. D., Blanchard, P. K., Chornock, R., Cowperthwaite, P. S., Eftekhari, T., Fong, W., Margutti, R., Villar, V. A., Williams, P. K. G., Brown, W., Annis, J., Bahramian, A., Brout, D., Brown, D. A., Chen, H. Y., Clemens, J. C., Dennihy, E., Dunlap, B., Holz, D. E., Marchesini, Ezequiel Joaquín, Massaro, F., Moskowitz, N., Pelisoli, I., Rest, A., Ricci, F., Sako, M., Soares-Santos, M., Strader, J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
Materias:
Física
binaries: close
gravitational waves
nuclear reactions, nucleosynthesis, abundances
stars: neutron
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87367
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-87367
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
binaries: close
gravitational waves
nuclear reactions, nucleosynthesis, abundances
stars: neutron
spellingShingle Física
binaries: close
gravitational waves
nuclear reactions, nucleosynthesis, abundances
stars: neutron
Nicholl, M.
Berger, E.
Kasen, D.
Metzger, B. D.
Elias, J.
Briceño, C.
Alexander, K. D.
Blanchard, P. K.
Chornock, R.
Cowperthwaite, P. S.
Eftekhari, T.
Fong, W.
Margutti, R.
Villar, V. A.
Williams, P. K. G.
Brown, W.
Annis, J.
Bahramian, A.
Brout, D.
Brown, D. A.
Chen, H. Y.
Clemens, J. C.
Dennihy, E.
Dunlap, B.
Holz, D. E.
Marchesini, Ezequiel Joaquín
Massaro, F.
Moskowitz, N.
Pelisoli, I.
Rest, A.
Ricci, F.
Sako, M.
Soares-Santos, M.
Strader, J.
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
topic_facet Física
binaries: close
gravitational waves
nuclear reactions, nucleosynthesis, abundances
stars: neutron
description 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.
format Articulo
Articulo
author Nicholl, M.
Berger, E.
Kasen, D.
Metzger, B. D.
Elias, J.
Briceño, C.
Alexander, K. D.
Blanchard, P. K.
Chornock, R.
Cowperthwaite, P. S.
Eftekhari, T.
Fong, W.
Margutti, R.
Villar, V. A.
Williams, P. K. G.
Brown, W.
Annis, J.
Bahramian, A.
Brout, D.
Brown, D. A.
Chen, H. Y.
Clemens, J. C.
Dennihy, E.
Dunlap, B.
Holz, D. E.
Marchesini, Ezequiel Joaquín
Massaro, F.
Moskowitz, N.
Pelisoli, I.
Rest, A.
Ricci, F.
Sako, M.
Soares-Santos, M.
Strader, J.
author_facet Nicholl, M.
Berger, E.
Kasen, D.
Metzger, B. D.
Elias, J.
Briceño, C.
Alexander, K. D.
Blanchard, P. K.
Chornock, R.
Cowperthwaite, P. S.
Eftekhari, T.
Fong, W.
Margutti, R.
Villar, V. A.
Williams, P. K. G.
Brown, W.
Annis, J.
Bahramian, A.
Brout, D.
Brown, D. A.
Chen, H. Y.
Clemens, J. C.
Dennihy, E.
Dunlap, B.
Holz, D. E.
Marchesini, Ezequiel Joaquín
Massaro, F.
Moskowitz, N.
Pelisoli, I.
Rest, A.
Ricci, F.
Sako, M.
Soares-Santos, M.
Strader, J.
author_sort Nicholl, M.
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
title_short 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_sort electromagnetic counterpart of the binary neutron star merger ligo/virgo gw170817. iii. optical and uv spectra of a blue kilonova from fast polar ejecta
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87367
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