The Double-peaked Radio Light Curve of Supernova PTF11qcj

Nipuni T. Palliyaguru, Alessandra Corsi, Dale A. Frail, Jozsef Vinkó, J. Craig Wheeler, Avishay Gal-Yam, S. Bradley Cenko, Shrinivas R. Kulkarni, Mansi M. Kasliwal

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15 Scopus citations


We present continued radio and X-ray follow-up observations of PTF11qcj, a highly energetic broad-lined Type Ic supernova (SN), with a radio peak luminosity comparable to that of the γ-ray burst (GRB) associated SN 1998bw. The latest radio observations, carried out with the Karl G. Jansky Very Large Array, extend up to ∼5 yr after the PTF11qcj optical discovery. The radio light curve shows a double-peak profile, possibly associated with density variations in the circumstellar medium (CSM), or with the presence of an off-axis GRB jet. Optical spectra of PTF11qcj taken during both peaks of the radio light curve do not show the broad Hα features typically expected from H-rich circumstellar interaction. Modeling of the second radio peak within the CSM-interaction scenario requires a flatter density profile and an enhanced progenitor mass-loss rate compared to those required to model the first peak. Our radio data alone cannot rule out the alternative scenario of an off-axis GRB powering the second radio peak, but the derived GRB parameters are somewhat unusual compared to typical values found for cosmological long GRBs. On the other hand, Chandra X-ray observations carried out during the second radio peak are compatible with the off-axis GRB hypothesis, within the large measurement errors. We conclude that VLBI measurements of the PTF11qcj radio ejecta are needed to unambiguously confirm or rule out the off-axis GRB jet scenario.

Original languageEnglish
Article number201
JournalAstrophysical Journal
Issue number2
StatePublished - 2019


  • supernovae: general
  • supernovae: individual (PTF11qcj)


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