SN 2018ijp: The explosion of a stripped-envelope star within a dense H-rich shell?

L. Tartaglia, J. Sollerman, C. Barbarino, F. Taddia, E. Mason, M. Berton, K. Taggart, E. C. Bellm, K. De, S. Frederick, C. Fremling, A. Gal-Yam, V. Z. Golkhou, M. Graham, A. Y.Q. Ho, T. Hung, S. Kaye, Y. L. Kim, R. R. Laher, F. J. MasciD. A. Perley, M. D. Porter, D. J. Reiley, R. Riddle, B. Rusholme, M. T. Soumagnac, R. Walters

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Abstract

In this paper, we discuss the outcomes of the follow-up campaign of SN 2018ijp, discovered as part of the Zwicky Transient Facility survey for optical transients. Its first spectrum shows similarities to broad-lined Type Ic supernovae around maximum light, whereas later spectra display strong signatures of interaction between rapidly expanding ejecta and a dense H-rich circumstellar medium, coinciding with a second peak in the photometric evolution of the transient. This evolution, along with the results of modeling of the first light-curve peak, suggests a scenario where a stripped star exploded within a dense circumstellar medium. The two main phases in the evolution of the transient could be interpreted as a first phase dominated by radioactive decays, and a later interaction-dominated phase where the ejecta collide with a pre-existing shell. We therefore discuss SN 2018jp within the context of a massive star depleted of its outer layers exploding within a dense H-rich circumstellar medium.

Original languageEnglish
Article numberA174
Number of pages11
JournalAstronomy and Astrophysics
Volume650
DOIs
Publication statusPublished - 1 Jun 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Supernovae: general
  • Supernovae: individual: SN 2018ijp

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