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: | Raffaella Margutti, N. Moskowitz, Matt Nicholl, James Annis, Federica Ricci, Edo Berger, Arash Bahramian, Cesar Briceno, W. Fong, Jay Strader, J. Elias, Ryan Chornock, Ingrid Pelisoli, Tarraneh Eftekhari, Marcelle Soares-Santos, Philip S. Cowperthwaite, Erik Dennihy, D. Brout, Armin Rest, V. A. Villar, B. H. Dunlap, Francesco Massaro, Masao Sako, P. K. Blanchard, Warren R. Brown, Peter K. G. Williams, Kate D. Alexander, Daniel E. Holz, J. C. Clemens, E. J. Marchesini, Brian D. Metzger, Daniel Kasen, Hsin-Yu Chen, Duncan A. Brown |
|---|---|
| Přispěvatelé: | Nicholl, M., Berger, E., Kasen, D., Metzger, B. D., Elias, J., Briceã±o, 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., Briceño, C., Chen, H. -.Y. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
close [binaries]
Ciencias Físicas Astrophysics Kilonova 7. Clean energy 01 natural sciences nuclear reaction Spectral line purl.org/becyt/ford/1 [https] nuclear reactions nucleosynthesis abundances Astrophysics::Solar and Stellar Astrophysics Emission spectrum Ejecta 010303 astronomy & astrophysics gravitational wave Physics High Energy Astrophysical Phenomena (astro-ph.HE) abundance binaries: close gravitational waves stars: neutron Astronomy and Astrophysics Space and Planetary Science nucleosynthesis nuclear reactions nucleosynthesis abundance Astrophysics - Solar and Stellar Astrophysics nucleosynthesi Astrophysics::Earth and Planetary Astrophysics Astrophysics - High Energy Astrophysical Phenomena CIENCIAS NATURALES Y EXACTAS Astrophysics - Cosmology and Nongalactic Astrophysics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics neutron [stars] Nucleosynthesis 0103 physical sciences nuclear reactions Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics 010308 nuclear & particles physics Gravitational wave abundances Física purl.org/becyt/ford/1.3 [https] Astronomy and Astrophysic Black hole Astronomía Neutron star 13. Climate action |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | 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 La lista completa de autores que integran el documento puede consultarse en el archivo Instituto de Astrofísica de La Plata |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|