2018年7月1日
Is the Macronova in GW170817 Powered by the Central Engine?
Astrophysical Journal
- ,
- ,
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- 巻
- 861
- 号
- 1
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.3847/1538-4357/aac4a8
- 出版者・発行元
- IOP PUBLISHING LTD
© 2018. The American Astronomical Society. All rights reserved. The gravitational wave event GW170817 from a binary neutron star merger is accompanied by electromagnetic counterparts, and the optical and near-infrared emission is called a macronova (or kilonova). Although the radioactivity of synthesized r-process elements is widely discussed as an energy source, its decisive evidence is not clearly shown yet. We discuss a macronova powered by central engine activities such as jet activities and X-rays from the matter fallback and show that the engine model allows much broader parameter spaces, in particular, smaller ejecta mass (∼10-4 - 1.01 M⊙), than the r-process model. The blue and red macronovae are naturally explained by various combinations of the ejecta, such as a cocoon and merger ejecta with the energy sources of jets and X-rays. The required energy injection is very similar to the X-ray excess observed in GRB 130603B, with a power-law slope of ∼ -1.3. The required lanthanoid fraction for the opacity can also be consistent with the Galactic one. Early or late multiwavelength observations are crucial for revealing the central engine of short gamma-ray bursts and the r-process nucleosynthesis.
- リンク情報
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- DOI
- https://doi.org/10.3847/1538-4357/aac4a8
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000437236900007&DestApp=WOS_CPL
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85050106683&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85050106683&origin=inward
- URL
- http://orcid.org/0000-0002-3517-1956
- ID情報
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- DOI : 10.3847/1538-4357/aac4a8
- ISSN : 0004-637X
- eISSN : 1538-4357
- ORCIDのPut Code : 46178069
- SCOPUS ID : 85050106683
- Web of Science ID : WOS:000437236900007