A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Statistical Properties of the Nebular Spectra of 103 Stripped-envelope Core-collapse Supernovae*
Tekijät: Fang Qiliang, Maeda Keiichi, Kuncarayakti Hanindyo, Tanaka Masaomi, Kawabata Koji S., Hattori Takashi, Aoki Kentaro, Moriya Takashi J., Yamanaka Masayuki
Kustantaja: IOP Publishing Ltd
Julkaisuvuosi: 2022
Journal: Astrophysical Journal
Tietokannassa oleva lehden nimi: ASTROPHYSICAL JOURNAL
Lehden akronyymi: ASTROPHYS J
Artikkelin numero: 151
Vuosikerta: 928
Numero: 2
Sivujen määrä: 31
ISSN: 0004-637X
eISSN: 1538-4357
DOI: https://doi.org/10.3847/1538-4357/ac4f60
Verkko-osoite: https://iopscience.iop.org/article/10.3847/1538-4357/ac4f60
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/175242262
Preprintin osoite: https://arxiv.org/abs/2201.11467
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] lambda lambda 6300, 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 similar to 1 sigma 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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
