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DOI	10.1126/science.aaq0186
	Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger
	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.
发表日期	2017
ISSN	0036-8075
起始页码	1574
结束页码	1578
卷号	358 期号:6370
英文摘要	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;000þ 3400900 to 9300þ 300300 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.
英文关键词	cooling; gravity wave; instrumentation; numerical model; observational method; optical property; spectroscopy; wave spectrum; wave velocity; absorption; Article; electromagnetism; gravity; neutron; photometry; priority journal; spectral sensitivity; spectroscopy; spectrum; time series analysis; ultraviolet spectroscopy; velocity
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/245446
作者单位	Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, United States; Institute for Astronomy, University of Hawai’i, 2680 Woodlawn Drive, Honolulu, HI 96822, United States; Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena, Chile; Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Avenida Ejército 441, Santiago, Chile; Millennium Institute of Astrophysics, Santiago, Chile; Departments of Physics and Astronomy, 366 LeConte Hall, University of California–Berkeley, Berkeley, CA 94720, United States; Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Department of Astronomy and Astrophysics, University of California–Santa Cruz, Santa Cruz, CA 95064, United States; Dark Cosmology Center, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, Copenhagen, 2100, Denmark; Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 2...
推荐引用方式 GB/T 7714	Shappee B.J.,Simon J.D.,Drout M.R.,et al. Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger[J],2017,358(6370).
APA	Shappee B.J..,Simon J.D..,Drout M.R..,Piro A.L..,Morrell N..,...&Wan Z..(2017).Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger.Science,358(6370).
MLA	Shappee B.J.,et al."Early spectra of the gravitational wave source GW170817: Evolution of a neutron star merger".Science 358.6370(2017).