IPTF17cw: An Engine-driven Supernova Candidate Discovered Independent of a Gamma-Ray Trigger

A. Corsi, S. B. Cenko, M. M. Kasliwal, R. Quimby, S. R. Kulkarni, D. A. Frail, A. M. Goldstein, N. Blagorodnova, V. Connaughton, D. A. Perley, L. P. Singer, C. M. Copperwheat, C. Fremling, T. Kupfer, A. S. Piascik, I. A. Steele, F. Taddia, H. Vedantham, A. Kutyrev, N. T. PalliyaguruO. Roberts, J. Sollerman, E. Troja, S. Veilleux

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Abstract

We present the discovery, classification, and radio-to-X-ray follow-up observations of iPTF17cw, a broad-lined (BL) type Ic supernova (SN) discovered by the intermediate Palomar Transient Factory (iPTF). Although it is unrelated to the gravitational wave trigger, this SN was discovered as a happy by-product of the extensive observational campaign dedicated to the follow-up of Advanced LIGO event GW 170104. The spectroscopic properties and inferred peak bolometric luminosity of iPTF17cw are most similar to the gamma-ray-burst (GRB)-associated SN, SN 1998bw, while the shape of the r-band light curve is most similar to that of the relativistic SN, SN 2009bb. Karl G. Jansky Very Large Array (VLA) observations of the iPTF17cw field reveal a radio counterpart ≈10 times less luminous than SN 1998bw, and with a peak radio luminosity comparable to that of SN 2006aj/GRB 060218 and SN 2010bh/GRB 100316D. Our radio observations of iPTF17cw imply a relativistically expanding outflow. However, further late-time observations with the VLA in its most extended configuration are needed to confirm fading of the iPTF17cw radio counterpart at all frequencies. X-ray observations carried out with Chandra reveal the presence of an X-ray counterpart with a luminosity similar to that of SN 2010bh/GRB 100316D. Searching the Fermi catalog for possible γ-rays reveals that GRB 161228B is spatially and temporally compatible with iPTF17cw. The similarity to SN 1998bw and SN 2009bb, the radio and X-ray detections, and the potential association with GRB 161228B all point to iPTF17cw being a new candidate member of the rare sample of optically discovered engine-driven BL-Ic SNe associated with relativistic ejecta.

Original languageEnglish
Article number54
JournalAstrophysical Journal
Volume847
Issue number1
DOIs
StatePublished - Sep 20 2017

Keywords

  • gamma-ray burst: individual (GRB 161228B)
  • gravitational waves
  • supernovae: individual (iPTF17cw)

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