Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive star

Tartaglia, L.; Pastorello, A.; Sullivan, M.; Baltay, C.; Rabinowitz, D.; Nugent, P.; Drake, A.J.; Djorgovski, S.G.; Gal-Yam, A.; Fabrika, S.; Barsukova, E.A.; Goranskij, V.P.; et al.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 июня 2016 г.

Авторы: Tartaglia L., Pastorello A., Sullivan M., Baltay C., Rabinowitz D., Nugent P., Drake A.J., Djorgovski S.G., Gal-Yam A., Fabrika S., Barsukova E.A., Goranskij V.P., et al
Журнал: Monthly Notices of the Royal Astronomical Society
Том: 459
Номер: 1
Год издания: 2016
Издательство: Oxford Journals, Oxford University Press
Местоположение издательства: Oxford, UK, England
Первая страница: 1039
Последняя страница: 1059
DOI: 10.1093/mnras/stw675
Аннотация: We report photometric and spectroscopic observations of the optical transient LSQ13zm. Historical data reveal the presence of an eruptive episode (that we label as `2013a') followed by a much brighter outburst (`2013b') three weeks later, that we argue to be the genuine supernova explosion. This sequence of events closely resemble those observed for SN 2010mc and (in 2012) SN 2009ip. The absolute magnitude reached by LSQ13zm during 2013a (M_R = -14.87 ± 0.25 mag) is comparable with those of supernova impostors, while that of the 2013b event (M_R = -18.46 ± 0.21 mag) is consistent with those of interacting supernovae. Our spectra reveal the presence of a dense and structured circumstellar medium, probably produced through numerous pre-supernova mass-loss events. In addition, we find evidence for high-velocity ejecta, with a fraction of gas expelled at more than 20 000 km/s. The spectra of LSQ13zm show remarkable similarity with those of well-studied core-collapse supernovae. From the analysis of the available photometric and spectroscopic data, we conclude that we first observed the last event of an eruptive sequence from a massive star, likely a Luminous Blue Variable, which a short time later exploded as a core-collapse supernova. The detailed analysis of archival images suggest that the host galaxy is a star-forming Blue Dwarf Compact Galaxy.
Добавил в систему: Горанский Виталий Петрович

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Interacting supernovae and supernova impostors. LSQ13zm: an outburst heralds the death of a massive starстатья

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