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. Masci; D. A. Perley; M. D. Porter; D. J. Reiley; R. Riddle; B. Rusholme; M. T. Soumagnac; R. Walters

doi:10.1051/0004-6361/202039068

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arXiv · 2009.03331

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

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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 an 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.

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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. Masci, D. A. Perley, M. D. Porter, D. J. Reiley, R. Riddle, B. Rusholme, M. T. Soumagnac, R. Walters. 2020-09-07. SN 2018ijp: the explosion of a stripped-envelope star within a dense H-rich shell?. https://doi.org/10.1051/0004-6361/202039068

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