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Systematic investigation of the effect of $^56$Ni mixing in the early photospheric velocity evolution of stripped-envelope supernovaeстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 декабря 2020 г.
- Авторы: Moriya Takashi J., Suzuki Akihiro, Takiwaki Tomoya, Pan Yen-Chen, Blinnikov Sergei I.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 497
- Номер: 2
- Год издания: 2020
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 1619
- Последняя страница: 1626
- DOI: 10.1093/mnras/staa2060
- Аннотация: Mixing of $^56$Ni, whose nuclear decay energy is a major luminosity source in stripped-envelope supernovae, is known to affect the observational properties of stripped-envelope supernovae such as light-curve and colour evolution. Here we systematically investigate the effect of $^56$Ni mixing on the photospheric velocity evolution in stripped-envelope supernovae. We show that $^56$Ni mixing significantly affects the early photospheric velocity evolution. The photospheric velocity, which is often used to constrain the ejecta mass and explosion energy, significantly varies by just changing the degree of $^56$Ni mixing. In addition, the models with a small degree of $^56$Ni mixing show a flattening in the early photospheric velocity evolution, while the fully mixed models show a monotonic decrease. The velocity flattening appears in both helium and carbon+oxygen progenitor explosions with a variety of ejecta mass, explosion energy, and $^56$Ni mass. Some stripped- envelope supernovae with early photospheric velocity information do show such a flattening. We find that Type Ib SN 2007Y, which has early photospheric velocity information, has a signature of a moderate degree of $^56$Ni mixing in the photospheric velocity evolution and about half of the ejecta is mixed in it. The immediate spectroscopic follow-up observations of stripped- envelope supernovae shortly after the explosion providing the early photospheric evolution give an important clue to constrain $^56$Ni mixing in the ejecta.
- Добавил в систему: Блинников Сергей Иванович