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The unpolarized macronova associated with the gravitational wave event GW 170817

文献类型:期刊论文

AuthorCovino, 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
SourceNATURE ASTRONOMY
Issued Date2017-11-01
Volume1Issue:11Pages:791-794
ISSN2397-3366
DOI10.1038/s41550-017-0285-z
Corresponding AuthorCovino, S.(stefano.covino@brera.inaf.it)
English 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.
WOS KeywordGAMMA-RAY BURSTS ; COMPACT OBJECT MERGERS ; NEUTRON-STAR MERGERS ; POLARIZATION ; NUCLEOSYNTHESIS ; AFTERGLOW ; LIGHT
WOS Research AreaAstronomy & Astrophysics
Language英语
WOS IDWOS:000415271700008
PublisherNATURE PUBLISHING GROUP
源URL[http://libir.pmo.ac.cn/handle/332002/22541]  
Collection中国科学院紫金山天文台
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
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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