The bright Type IIP SN 2009bw, showing signs of interaction
Abstract
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. Copernico = Copernico Telescope (Mt Ekar, Asiago, Italy); TNG = Telescopio Nazionale Galileo (La Palma, Spain); LT = Liverpool Telescope (La Palma, Spain); NOT = Nordic Optical Telescope (La Palma, Spain); CAHA = Calar Alto Observatory 2.2-m Telescope (Sierra de los Filabres, Andalucia, Spain); Swift orbiting telescope by NASA; SAO-RAS = Special Astrophysical Observatory 1-m Telescope (Mt Pastukhov, Russia); THO = Taurus Hill Observatory (Hill Härkämäki, Finland); S50 = 0.5-m Newton Telescope (Tatranska Lomnica, Slovakia); M70 = 0.7-m Cassegrain Telescope (Moscow, Russia); C60 = 0.6-m Cassegrain Telescope (Observatory of Sternberg Astronomical Institute, Nauchnyi, Crimea); C50 = 0.5-m Maksutov Telescope Meniscus (Observatory of SAI, Nauchnyi, Crimea).
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 2012
- DOI:
- 10.1111/j.1365-2966.2012.20685.x
- arXiv:
- arXiv:1202.0659
- Bibcode:
- 2012MNRAS.422.1122I
- Keywords:
-
- supernovae: general;
- supernovae: individual: SN 2009bw;
- galaxies: individual: UGC 2890;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- Accepted for publication in MNRAS, 19 pages, 13 figures, 9 tables