期刊
SCIENCE
卷 358, 期 6370, 页码 1574-1578出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaq0186
关键词
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资金
- NASA - Space Telescope Science Institute
- NASA [NAS 5-26555]
- Carnegie-Princeton Fellowships
- Carnegie-Dunlap Fellowship
- Dunlap Institute at the University of Toronto
- Carnegie Fellowship
- Fundo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT) [1151445]
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- U.S. Department of Energy (DOE) [DE-SC0008067]
- DOE Office of Nuclear Physics [DE-SC0017616]
- DOE SciDAC award [DE-SC0018297]
- Office of Energy Research, Office of High Energy and Nuclear Physics, Divisions of Nuclear Physics, of the DOE [DE-AC02-05CH11231]
- Physics Frontier Center [PHY 14-30152]
- JINA-Center for the Evolution of the Elements (JINA-CEE) - NSF
- NSF [AST-1518052]
- Gordon and Betty Moore Foundation
- Heising-Simons Foundation
- Alfred P. Sloan Foundation
- David and Lucile Packard Foundation
- Danish National Research Foundation
- Consejo Nacional de Ciencia y Tecnologia (CONACYT)
- Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT), Programa de Astronomia-Programa de Cooperacion Internacional, FONDO ALMA [31140024]
- University of California Institute for Mexico
- United States (UC MEXUS)-CONACYT
- Caltech through a Summer Undergraduate Research Fellowship (SURF)
- Associates SURF Endowment
- Kavli Foundation
- Niels Bohr International Academy
- Dark Cosmology Centre
- NASA
- UCSC Giving Day grant
- U.S. Department of Energy (DOE) [DE-SC0017616, DE-SC0008067] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien [1720756] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1720756] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1430152] Funding Source: National Science Foundation
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.
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