Idioma:

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

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, E. ; Massaro, F. ; Moskowitz, N. ; Pelisoli, I. ; Rest, A. ; Ricci, F. ; Sako, M. ; Soares-Santos, M. ; Strader, J.

Astrophysical journal. Letters, 2017-10, Vol.848 (2), p.L18 [Periódico revisado por pares]

Austin: The American Astronomical Society

Texto completo disponível

Citações Citado por

Enviar para

Título:
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
Autor: 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, E. ; Massaro, F. ; Moskowitz, N. ; Pelisoli, I. ; Rest, A. ; Ricci, F. ; Sako, M. ; Soares-Santos, M. ; Strader, J.
Assuntos: ASTRONOMY AND ASTROPHYSICS ; Astrophysical research ; Atomic properties ; binaries: close ; Binary stars ; Black holes ; Ejecta ; Emission lines ; Gravitational waves ; Hubble Space Telescope ; Kilonovae ; Neutron stars ; Neutrons ; Nuclear fusion ; nuclear reactions, nucleosynthesis, abundances ; Space telescopes ; Star mergers ; stars: neutron ; Stellar winds ; Telescopes ; Ultraviolet spectra
É parte de: Astrophysical journal. Letters, 2017-10, Vol.848 (2), p.L18
Notas: LET35213
arXiv:1710.05456; FERMILAB-PUB-17-475-AE-CD
AC02-07CH11359
USDOE Office of Science (SC), High Energy Physics (HEP)
Descrição: 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 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 θ obs 45 ° of the orbital axis. Comparison to models suggests ∼0.03 M of blue ejecta, with a velocity of ∼ 0.3 c . The required lanthanide fraction is ∼ 10 − 4 , but this drops to < 10 − 5 in 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.
Editor: Austin: The American Astronomical Society
Idioma: Inglês

Links

View this record in Osti.gov

Voltar para lista de resultados

Anterior Resultado 7 Avançar Ir para próxima página

Realização: Logos de Redes Sociais:

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

Austin: The American Astronomical Society

Buscando em bases de dados remotas. Favor aguardar.