SN 2009jf: a slow-evolving stripped-envelope core-collapse supernova
Fugazza, D.; Sollerman, J.; Reichart, D. E.; Inserra, C.; Smartt, S. J.; Kankare, E.; Kotak, R.; Brimacombe, J.; Turatto, M.; Cappellaro, E.; Benetti, S.; Fraser, M.; Botticella, M. T.; Pignata, G.; Bufano, F.; Mazzali, P. A.; Harutyunyan, A.; Valenti, S.; Zampieri, L.; Haislip, J. B.; Mattila, S.; Magill, L.; Maza, J.; Hamuy, M.; Pastorello, A.; Ergon, M.; Taubenberger, S.; Ivarsen, K. M.; Crockett, M.; Eder, I.; Lacluyze, A. P.
United Kingdom, Italy, Chile, Sweden, Australia, Hungary, United States, Spain, Finland, Germany
Abstract
We present an extensive set of photometric and spectroscopic data for SN 2009jf, a nearby Type Ib supernova (SN), spanning from ∼20 d before B-band maximum to 1 yr after maximum. We show that SN 2009jf is a slowly evolving and energetic stripped-envelope SN and is likely from a massive progenitor (25-30 M⊙). The large progenitor's mass allows us to explain the complete hydrogen plus helium stripping without invoking the presence of a binary companion. The SN occurred close to a young cluster, in a crowded environment with ongoing star formation. The spectroscopic similarity with the He-poor Type Ic SN 2007gr suggests a common progenitor for some SNe Ib and Ic. The nebular spectra of SN 2009jf are consistent with an asymmetric explosion, with an off-centre dense core. We also find evidence that He-rich Ib SNe have a rise time longer than other stripped-envelope SNe, however confirmation of this result and further observations are needed. This paper is based on observations with several telescopes, including NTT(184.D-1151), VLT-UT1(085.D-0750,386.D-0126), NOT, WHT, TNG, PROMPT, Ekar, Calar Alto and Liverpool Telescope.