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Inserra, C; Turatto, M; Pastorello, A; Pumo, M. L; Baron, E; Benetti, S; Cappellaro, E; Taubenberger, S; Bufano, F; Elias-Rosa, N; Zampieri, L; Harutyunyan, A; Moskvitin, A. S; Nissinen, M; Stanishev, V; Tsvetkov, D. Y; Hentunen, V. P; Komarova, V. N; Pavlyuk, N. N; Sokolov, V. V; Sokolova, T. N
Monthly Notices of the Royal Astronomical Society, 20/May , Letnik: 422, Številka: 2Journal Article
We present photometry and spectroscopy of the Type IIP supernova (SN IIP) 2009bw in UGC 2890 from a few days after the outburst to 241 d. The light curve of SN 2009bw during the photospheric phase is similar to that of normal SNe IIP but with a brighter peak and plateau ( mag, mag). The luminosity drop from the photospheric to the nebular phase is one of the fastest ever observed, ∼2.2 mag in about 13 d. The radioactive tail of the bolometric light curve indicates that the amount of ejected 56Ni is ≈0.022 M⊙. The photospheric spectra reveal high-velocity lines of Hα and Hβ until about 105 d after the shock breakout, suggesting a possible early interaction between the SN ejecta and pre-existent circumstellar material, and the presence of CNO elements. By modelling the bolometric light curve, ejecta expansion velocity and photospheric temperature, we estimate a total ejected mass of ∼8-12 M⊙, a kinetic energy of ∼0.3 foe and an initial radius of ∼3.6-7 × 1013 cm.
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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