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PTF11rka: an interacting supernova at the crossroads of stripped-envelope and H-poor superluminous stellar core collapses

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Mazzali,  P. A.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Citation

Pian, E., Mazzali, P. A., Moriya, T. J., Rubin, A., Gal-Yam, A., Arcavi, I., et al. (2020). PTF11rka: an interacting supernova at the crossroads of stripped-envelope and H-poor superluminous stellar core collapses. Monthly Notices of the Royal Astronomical Society, 497(3), 3542-3556. doi:10.1093/mnras/staa2191.


Cite as: http://hdl.handle.net/21.11116/0000-0007-B6F6-6
Abstract
The hydrogen-poor supernova (SN) PTF11rka (z = 0.0744), reported by the Palomar Transient Factory, was observed with various telescopes starting a few days after the estimated explosion time of 2011 December 5 UT and up to 432 rest-frame days thereafter. The rising part of the light curve was monitored only in the RPTF filter band, and maximum in this band was reached ∼30 rest-frame days after the estimated explosion time. The light curve and spectra of PTF11rka are consistent with the core-collapse explosion of a ∼10 M carbon– oxygen core evolved from a progenitor of main-sequence mass 25–40 M, that liberated a kinetic energy Ek≈4 × 1051 erg, expelled ∼8 M of ejecta, and synthesized ∼0.5 M of 56Ni. The photospheric spectra of PTF11rka are characterized by narrow absorption lines that point to suppression of the highest ejecta velocities (≳ 15 000 km s−1). This would be expected if the ejecta impacted a dense, clumpy circumstellar medium. This in turn caused them to lose a fraction of their energy (∼5 × 1050 erg), less than 2 per cent of which was converted into radiation that sustained the light curve before maximum brightness. This is reminiscent of the superluminous SN 2007bi, the light-curve shape and spectra of which are very similar to those of PTF11rka, although the latter is a factor of 10 less luminous and evolves faster in time. PTF11rka is in fact more similar to gamma-ray burst SNe in luminosity, although it has a lower energy and a lower Ek/Mej ratio.