Two stripped envelope supernovae with circumstellar interaction

@article{Sollerman2020TwoSE,
  title={Two stripped envelope supernovae with circumstellar interaction},
  author={Jesper Sollerman and C. Fransson and Cristina Barbarino and Christoffer U. Fremling and Assaf Horesh and Erik C. Kool and Steve Schulze and Itai Sfaradi and S. Yang and Eric C. Bellm and Rick S. Burruss and Virginia Cunningham and Kishalay De and Andrew J. Drake and V. Zach Golkhou and David A. Green and Mansi M. Kasliwal and Shrinivas R. Kulkarni and Thomas Kupfer and Russ R. Laher and Frank J. Masci and Hector Rodriguez and Ben Rusholme and D. R. W. Williams and L. Yan and Jeffry Zolkower},
  journal={Astronomy and Astrophysics},
  year={2020},
  volume={643}
}
Context. We present observations of SN 2019tsf (ZTF19ackjszs) and SN 2019oys (ZTF19abucwzt). These two stripped envelope (SE) Type Ib supernovae (SNe) suddenly showed a (re-)brightening in their late light curves. We investigate this in the context of circumstellar material (CSM) interaction with previously ejected material, a phenomenon that is unusual among SE SNe. Aims. We use our follow-up photometry and spectroscopy for these supernovae to demonstrate the presence of CSM interaction… 

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