The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo
文献类型：期刊论文
| 作者 | Bulla, M.1; Covino, S.2; Kyutoku, K.3,4,5,6; Tanaka, M.7,8; Maund, J. R.9; Patat, F.10; Toma, K.7,11; Wiersema, K.12,13,14; Bruten, J.9; Jin, Z. P.15 |
| 刊名 | NATURE ASTRONOMY
 |
| 出版日期 | 2019 |
| 卷号 | 3期号:1页码:99-106 |
| ISSN号 | 2397-3366 |
| DOI | 10.1038/s41550-018-0593-y |
| 通讯作者 | Bulla, M.(mattia.bulla@fysik.su.se) ; Covino, S.(stefano.covino@inaf.it) |
| 英文摘要 | The gravitational-wave event GW 170817 was generated by the coalescence of two neutron stars and produced an electromagnetic transient, labelled AT 2017gfo, that was the target of a massive observational campaign. Polarimetry is a powerful diagnostic tool for probing the geometry and emission processes of unresolved sources, and the observed linear polarization for this event was consistent with being mostly induced by intervening dust, suggesting that the intrinsic emission was weakly polarized (P < 0.4-0.5%). Here we present a detailed analysis of the linear polarization expected from a merging neutron-star binary system by means of 3D Monte Carlo radiative transfer simulations assuming a range of possible configurations, wavelengths, epochs and viewing angles. We find that polarization originates from the non-homogeneous opacity distribution within the ejecta and can reach levels of 1% at early times (one to two days after the merger) and in the optical R band. Smaller polarization signals are expected at later epochs and different wavelengths. From the viewing-angle dependence of the polarimetric signal, we constrain the observer orientation of AT 2017gfo to within about 65 degrees from the polar direction. The detection of non-zero polarization in future events will unambiguously reveal the presence of a lanthanide-free ejecta component and unveil its spatial and angular distribution. |
| WOS关键词 | R-PROCESS NUCLEOSYNTHESIS ; ELECTROMAGNETIC COUNTERPART ; LIGHT CURVES ; MERGER ; SCATTERING ; SIGNATURES ; SPECTRA ; EJECTA ; LINE ; HOLE |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | NATURE PUBLISHING GROUP |
| WOS记录号 | WOS:000455194000025 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/19194]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Bulla, M.; Covino, S. |
| 作者单位 | 1.Stockholm Univ, Oskar Klein Ctr, Dept Phys, Stockholm, Sweden 2.Brera Astron Observ, Ist Nazl Astrofis, Merate, Italy 3.KEK, Inst Particle & Nucl Studies, Theory Ctr, Tsukuba, Ibaraki, Japan 4.Grad Univ Adv Studies Sokendai, Dept Particle & Nucl Phys, Tsukuba, Ibaraki, Japan 5.RIKEN, Interdisciplinary Theoret & Math Sci Program iTHE, Wako, Saitama, Japan 6.Kyoto Univ, Ctr Gravitat Phys, Yukawa Inst Theoret Phys, Kyoto, Japan 7.Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi, Japan 8.Natl Astron Observ Japan, Natl Inst Nat Sci, Mitaka, Tokyo, Japan 9.Univ Sheffield, Dept Phys & Astron, Sheffield, S Yorkshire, England 10.European Southern Observ, Garching, Germany |
| 推荐引用方式 GB/T 7714 | Bulla, M.,Covino, S.,Kyutoku, K.,et al. The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo[J]. NATURE ASTRONOMY,2019,3(1):99-106. |
| APA | Bulla, M..,Covino, S..,Kyutoku, K..,Tanaka, M..,Maund, J. R..,...&Testa, V.(2019).The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo.NATURE ASTRONOMY,3(1),99-106. |
| MLA | Bulla, M.,et al."The origin of polarization in kilonovae and the case of the gravitational-wave counterpart AT 2017gfo".NATURE ASTRONOMY 3.1(2019):99-106. |
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来源：紫金山天文台
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