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Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger

文献类型:期刊论文

AuthorPian, E.1; D'Avanzo, P.2; Enetti, S. B.; Branchesi, M.3,4,5; Rocato, E. B.6; Campana, S.2; Cappellaro, E.; Covino, S.2; D'Elia, V.6,7; Fynbo, J. P. U.8
SourceNATURE
Issued Date2017-11-02
Volume551Issue:7678Pages:67-+
ISSN0028-0836
DOI10.1038/nature24298
English Abstract

The merger of two neutron stars is predicted to give rise to three major detectable phenomena: a short burst of gamma-rays, a gravitational-wave signal, and a transient optical-near-infrared source powered by the synthesis of large amounts of very heavy elements via rapid neutron capture (the r-process)(1-3). Such transients, named 'macronovae' or 'kilonovae'(4-7), are believed to be centres of production of rare elements such as gold and platinum(8). The most compelling evidence so far for a kilonova was a very faint near-infrared rebrightening in the afterglow of a short gamma-ray burst(9,10) at redshift z = 0.356, although findings indicating bluer events have been reported(11). Here we report the spectral identification and describe the physical properties of a bright kilonova associated with the gravitational-wave source(12) GW170817 and gamma-ray burst(13,14) GRB 170817A associated with a galaxy at a distance of 40 megaparsecs from Earth. Using a series of spectra from ground-based observatories covering the wavelength range from the ultraviolet to the near-infrared, we find that the kilonova is characterized by rapidly expanding ejecta with spectral features similar to those predicted by current models(15,16). The ejecta is optically thick early on, with a velocity of about 0.2 times light speed, and reaches a radius of about 50 astronomical units in only 1.5 days. As the ejecta expands, broad absorption-like lines appear on the spectral continuum, indicating atomic species produced by nucleosynthesis that occurs in the post-merger fast-moving dynamical ejecta and in two slower (0.05 times light speed) wind regions. Comparison with spectral models suggests that the merger ejected 0.03 to 0.05 solar masses of material, including high-opacity lanthanides.

WOS KeywordGAMMA-RAY BURSTS ; COMPACT OBJECT MERGERS ; EXTINCTION
WOS Research AreaScience & Technology - Other Topics
Language英语
WOS IDWOS:000414222900045
PublisherNATURE PUBLISHING GROUP
源URL[http://libir.pmo.ac.cn/handle/332002/22592]  
Collection中国科学院紫金山天文台
Corresponding AuthorPian, E.
Affiliation1.INAF, Inst Space Astrophys & Cosm Phys, Via Gobetti 101, I-40129 Bologna, Italy
2.INAF, Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, Italy
3.INAF, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy
4.Gran Sasso Sci Inst, Viale F Crispi 7, Laquila, Italy
5.INFN, Lab Nazl Gran Sasso, I-67100 Laquila, Italy
6.INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy
7.ASI, Space Sci Data Ctr, Via Politecn, I-00133 Rome, Italy
8.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Maries Vej 30, DK-2100 Copenhagen O, Denmark
9.INAF, Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy
10.Univ Urbino Carlo Bo, Dipartimento Sci Pure & Applicate, Piazza Repubbl 13, I-61029 Urbino, Italy
Recommended Citation
GB/T 7714
Pian, E.,D'Avanzo, P.,Enetti, S. B.,et al. Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger[J]. NATURE,2017,551(7678):67-+.
APA Pian, E..,D'Avanzo, P..,Enetti, S. B..,Branchesi, M..,Rocato, E. B..,...&Ergani, D. V..(2017).Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger.NATURE,551(7678),67-+.
MLA Pian, E.,et al."Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger".NATURE 551.7678(2017):67-+.

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来源:紫金山天文台

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