The unpolarized macronova associated with the gravitational wave event GW 170817
Covino, S.1; Wiersema, K.2; Fan, Y. Z.3; Toma, K.4,5; Higgins, A. B.2; Melandri, A.1; D'Avanzo, P.1; Mundell, C. G.6; Palazzi, E.7; Tanvir, N. R.2; Bernardini, M. G.1,8; Branchesi, M.9,10; Brocato, E.11; Campana, S.1; Alighieri, S. di Serego12; Gotz, D.13; Fynbo, J. P. U.14; Gao, W.1,15,16; Gomboc, A.17; Gompertz, B.18; Greiner, J.19; Hjorth, J.14; Jin, Z. P.3; Kaper, L.20; Klose, S.21; Kobayashi, S.22; Kopac, D.23; Kouveliotou, C.28; Levan, A. J.24; Mao, J.25; Malesani, D.14; Pian, E.7; Rossi, A.7; Salvaterra, R.26; Starling, R. L. C.2; Steele, I.22; Tagliaferri, G.1; Troja, E.27; van der Horst, A. J.28,29; Wijers, R. A. M. J.20
Source PublicationNATURE ASTRONOMY
Corresponding AuthorCovino, S.(
AbstractThe merger of two dense stellar remnants including at least one neutron star is predicted to produce gravitational waves (GWs) and short-duration gamma ray burststs. In the process, neutron-rich material is ejected from the system and heavy elements are synthesized by r-process nucleosynthesis(1,3). The radioactive decay of these heavy elements produces additional transient radiation termed kilonova or macronova(4-10). We report the detection of linear optical polarization, P= (0.50 +/- 0.07)%, 1.46 days after detection of the GWs from GW170817-a double neutron star merger associated with an optical macronova counterpart and a short gamma ray burst(11-14). The optical emission from a macronova is expected to be characterized by a blue, rapidly decaying component and a red, more slowly evolving component due to material rich in heavy elements-the lanthanidess(15). The polarization measurement was made when the macronova was still in its blue phase, during which there was an important contribution from a lanthanide-free outflow. The low degree of polarization is consistent with intrinsically unpolarized emission scattered by galactic dust, suggesting a symmetric geometry of the emitting region and low inclination of the merger system. Stringent upper limits to the polarization degree from 2.45-9.48 days post-burst are consistent with the lanthanides-rich macronova interpretation.
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000415271700008
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Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorCovino, S.
Affiliation1.Ist Nazl Astrofis, Brera Astron Observ, Via Bianchi 46, I-23807 Merate, LC, Italy
2.Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
4.Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan
5.Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan
6.Univ Bath, Dept Phys, Claverton Down, Bath BA2 7AY, Avon, England
7.Ist Nazl Astrofis, Ist Astrofis Spaziale & Fis Cosm Bologna, Via Gobetti 101, I-40129 Bologna, Italy
8.Univ Montpellier, CNRS, IN2P3, Lab Univ & Particules Montpellier, F-34095 Montpellier, France
9.Gran Sasso Sci Inst, I-67100 Laquila, Italy
10.Ist Nazl Fis Nucl, I-67100 Laquila, Italy
11.Ist Nazl Astrofis, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy
12.Ist Nazl Astrofis, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
13.Commissariat Energie Atom Saclay, Direct Rech Fondamentale, Lrfu, Dept Astrophys, F-91191 Gif Sur Yvette, France
14.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, Juliane Manes Vej 30, DK-2100 Copenhagen, Denmark
15.Nanjing Normal Univ, Dept Phys, Nanjing 210046, Jiangsu, Peoples R China
16.Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210046, Jiangsu, Peoples R China
17.Univ Nova Gorica, Ctr Astrophys & Cosmol, Vipavska 11c, Ajdovscina 5270, Slovenia
18.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
19.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany
20.Univ Amsterdam, Anton Pannekoek Inst, Sci Pk, NL-1098 XH Amsterdam, Netherlands
21.Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
22.Liverpool John Moores Univ, Astrophys Res Inst, Ic2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
23.Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
24.Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
25.Chinese Acad Sci, Yunnan Observ, Kunming 650011, Yunnan, Peoples R China
26.Ist Nazl Astrofis, Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy
27.Univ Maryland, Dept Astron, College Pk, MD 20742 USA
28.George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA
29.Astron Phys & Stat Inst Sci, Washington, DC 20052 USA
Recommended Citation
GB/T 7714
Covino, S.,Wiersema, K.,Fan, Y. Z.,et al. The unpolarized macronova associated with the gravitational wave event GW 170817[J]. NATURE ASTRONOMY,2017,1(11):791-794.
APA Covino, S..,Wiersema, K..,Fan, Y. Z..,Toma, K..,Higgins, A. B..,...&Wijers, R. A. M. J..(2017).The unpolarized macronova associated with the gravitational wave event GW 170817.NATURE ASTRONOMY,1(11),791-794.
MLA Covino, S.,et al."The unpolarized macronova associated with the gravitational wave event GW 170817".NATURE ASTRONOMY 1.11(2017):791-794.
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