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

Tartaglia, L, Sollerman, J, Barbarino, C, Taddia, F, Mason, E, Berton, M, Taggart, K, Bellm, EC, De, K, Frederick, S, Fremling, C, Gal-Yam, A, Golkhou, VZ, Graham, M, Ho, AYQ, Hung, T, Kaye, S, Kim, YL, Laher, RR, Masci, FJ , Perley, DA, Porter, MD, Reiley, DJ, Riddle, R, Rusholme, B, Soumagnac, MT and Walters, R (2021) SN 2018ijp: the explosion of a stripped-envelope star within a dense H-rich shell? Astronomy and Astrophysics, 650. ISSN 0004-6361

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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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
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Date Deposited: 29 Nov 2021 16:49
Last Modified: 29 Nov 2021 17:00
DOI or Identification number: 10.1051/0004-6361/202039068
URI: https://researchonline.ljmu.ac.uk/id/eprint/15834

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