Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger
Pian, 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; Getman, F.9; Ghirlanda, G.2; Ghisellini, G.2; Grado, A.9; Greco, G.10,11; Hjorth, J.8; Kouveliotou, C.12,13; Levan, A.14; Limatola, L.9; Alesani, D. M.8; Azzali, P. A. M.15,16; Elandri, A. M.2; Oller, P. M.17; Icastro, L. N.1; Palazzi, E.1; Piranomonte, S.6; Rossi, A.1; Salafia, O. S.2,18; Selsing, J.8; Stratta, G.10,11; Tanaka, M.19; Tanvir, N. R.20; Tomasella, L.; Watson, D.8; Yang, S.21,22; Amati, L.1; Antonelli, L. A.6; Ascenzi, S.6,23,24; Ernardini, M. G. B.2,25; Boer, M.26; Ufano, F. B.27; Ulgarelli, A. B.1; Capaccioli, M.9,28; Casella, P.6; Castro-Tirado, A. J.29; Chassande-Mottin, E.30; Ciolfi, R.31; Copperwheat, C. M.15; Dadina, M.1; De Cesare, G.1; Di Paola, A.1,6; Fan, Y. Z.32; Gendre, B.33; Giuffrida, G.6; Giunta, A.6; Hunt, L. K.34; Israel, G. L.6; Jin, Z. -P.32; Kasliwal, M. M.35; Klose, S.36; Lisi, M.6; Longo, F.37,38; Aiorano, E. M.1; Apelli, M. M.39; Asetti, N. M.1,40; Ava, L. N.2,41; Patricelli, B.42; Perley, D.15; Pescalli, A.2,43; Piran, T.44; Possenti, A.45; Pulone, L.6; Azzano, M. R.42; Salvaterra, R.46; Schipani, P.9; Spera, M.; Stamerra, A.42,47; Stella, L.6; Tagliaferri, G.2; Testa, V.6; Troja, E.48; Turatto, M.; Ergani, S. D. V.2,49; Ergani, D. V.1
Source PublicationNATURE

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.

Indexed BySCI
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000414222900045
Citation statistics
Cited Times:267[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
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
11.INFN, Sez Firenze, I-50019 Sesto Fiorentino, Italy
12.George Washington Univ, APSIS, Corcoran Hall, Washington, DC 20052 USA
13.George Washington Univ, Dept Phys, Corcoran Hall, Washington, DC 20052 USA
14.Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England
15.Liverpool John Moores Univ, Astrophys Res Inst, Liverpool Sci Pk,IC2,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
16.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany
17.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
18.Univ Milano Bicocca, Dipartimento Fis G Occhialini, Piazza Sci 3, I-20126 Milan, Italy
19.Natl Astron Observ Japan, Mitaka, Tokyo, Japan
20.Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England
21.Padova Univ, Dept Astron & Phys, Padua, Italy
22.Univ Calif Davis, Dept Astron, Davis, CA 95616 USA
23.Univ Roma La Sapienza, Dipartimento Fis, Piazzale Aldo Moro 2, I-00185 Rome, Italy
24.Univ Roma Tor Vergata, Via Ric Sci 1, I-00133 Rome, Italy
25.Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, Montpellier, France
26.CNRS, OCA, UCA, ARTEMIS, Blvd Observ,CS 34229, F-06304 Nice 4, France
27.INAF Osservatorio Astron Catania, Via S Sofia 78, I-95123 Catania, Italy
28.Univ Naples Federico II, Dept Phys, Corso Umberto I 40, I-80138 Naples, Italy
29.Inst Astrofis Andalucia CSIC, Glorieta Astron, E-18008 Granada, Spain
30.Univ Paris Diderot, APC, CNRS IN2P3, CEA Irfu,Observ Paris,Sorbonne Paris Cite, Paris, France
31.INFN TIFPA, Trento Inst Fundamental Phys & Applicat, Via Sommar 14, I-38123 Trento, Italy
32.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
33.Univ Virgin Isl, 2 John Brewers Bay, St Thomas, VI 00802 USA
34.INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy
35.CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA
36.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
37.Univ Trieste, I-34127 Trieste, Italy
38.INFN Trieste, I-34127 Trieste, Italy
39.Univ Innsbruck, Inst Astrophys & Particle Phys, Technikerstr 25-8, A-6020 Innsbruck, Austria
40.Univ Andres Bello, Dept Ciencias Fis, Fernandez Concha 700, Santiago, Chile
41.INAF, Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy
42.Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy
43.Univ Insubria, Via Valleggio 11, I-22100 Como, Italy
44.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
45.INAF, Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, Italy
46.INAF, Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy
47.INAF, Osservatorio Astron Torino, Pino Torinese, Italy
48.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
49.PSL Res Univ, CNRS, Observ Paris, GEPI, Pl Jules Janssen, F-92190 Meudon, France
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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