Details

Autor(en) / Beteiligte

• Shappee, B. J.
• Simon, J. D.
• Drout, M. R.
• Piro, A. L.
• Morrell, N.
• Prieto, J. L.
• Kasen, D.
• Holoien, T. W.-S.
• Kollmeier, J. A.
• Kelson, D. D.
• Coulter, D. A.
• Foley, R. J.
• Kilpatrick, C. D.
• Siebert, M. R.
• Madore, B. F.
• Murguia-Berthier, A.
• Pan, Y.-C.
• Prochaska, J. X.
• Ramirez-Ruiz, E.
• Rest, A.
• Adams, C.
• Alatalo, K.
• Bañados, E.
• Baughman, J.
• Bernstein, R. A.
• Bitsakis, T.
• Boutsia, K.
• Bravo, J. R.
• Di Mille, F.
• Higgs, C. R.
• Ji, A. P.
• Maravelias, G.
• Marshall, J. L.
• Placco, V. M.
• Prieto, G.
• Wan, Z.

Titel

Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger

Ist Teil von

• Science (American Association for the Advancement of Science), 2017-12, Vol.358 (6370), p.1574-1578

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2017

Quelle

Science Online科学在线

Beschreibungen/Notizen

• On 17 August 2017, Swope Supernova Survey 2017a (SSS17a) was discovered as the optical counterpart of the binary neutron star gravitational wave event GW170817. We report time-series spectroscopy of SSS17a from 11.75 hours until 8.5 days after the merger. Over the first hour of observations, the ejecta rapidly expanded and cooled. Applying blackbody fits to the spectra, we measured the photosphere cooling from 11,000 − 900 + 3400 to 9300 − 300 + 300 kelvin, and determined a photospheric velocity of roughly 30% of the speed of light. The spectra of SSS17a began displaying broad features after 1.46 days and evolved qualitatively over each subsequent day, with distinct blue (early-time) and red (late-time) components. The late-time component is consistent with theoretical models of r-process–enriched neutron star ejecta, whereas the blue component requires high-velocity, lanthanide-free material.