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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.

SN 2009jf: a slow‐evolving stripped‐envelope core‐collapse supernova ★