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タイトル: | Statistical Properties of the Nebular Spectra of 103 Stripped-envelope Core-collapse Supernovae |
著者: | Fang, Qiliang Maeda, Keiichi Kuncarayakti, Hanindyo Tanaka, Masaomi Kawabata, Koji S. Hattori, Takashi Aoki, Kentaro Moriya, Takashi J. Yamanaka, Masayuki |
著者名の別形: | 方, 其亮 前田, 啓一 山中, 雅之 |
キーワード: | Core-collapse supernovae Transient sources |
発行日: | 1-Apr-2022 |
出版者: | American Astronomical Society |
誌名: | The Astrophysical Journal |
巻: | 928 |
号: | 2 |
論文番号: | 151 |
抄録: | We present an analysis of the nebular spectra of 103 stripped-envelope (SE) supernovae (SNe) collected from the literature and observed with the Subaru Telescope from 2002 to 2012, focusing on [O i] λλ6300, 6363. The line profile and width of [O i] are employed to infer the ejecta geometry and the expansion velocity of the inner core; these two measurements are then compared with the SN subtypes, and further with the [O i]/[Ca ii] ratio, which is used as an indicator of the progenitor CO core mass. Based on the best-fit results of the [O i] profile, the objects are classified into different morphological groups, and we conclude that the deviation from spherical symmetry is a common feature for all types of SESNe. There is a hint (at the ∼1σ level) that the distributions of the line profile fractions are different between canonical SESNe and broad-line SNe Ic. A correlation between [O i] width and [O i]/[Ca ii] is discerned, indicating that the oxygen-rich material tends to expand faster for objects with a more massive CO core. Such a correlation can be utilized to constrain the relation between the progenitor mass and the kinetic energy of the explosion. Further, when [O i]/[Ca ii] increases, the fraction of objects with Gaussian [O i] profile increases, while those with double-peaked profile decreases. This phenomenon connects ejecta geometry and the progenitor CO core mass. |
著作権等: | © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/277549 |
DOI(出版社版): | 10.3847/1538-4357/ac4f60 |
出現コレクション: | 学術雑誌掲載論文等 |
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