Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae

S J Prentice, C Inserra, S Schulze, M Nicholl, P A Mazzali, S D Vergani, L Galbany, J P Anderson, C Ashall, T W Chen, M Deckers, M Delgado Manche no, R González Díaz, S González-Gaitán, M Gromadzki, C P Gutiérrez, L Harvey, A Kozyreva, M R Magee, K MaguireT E Müller-Bravo, S Mu noz Torres, P J Pessi, J Sollerman, J Teffs, J H Terwel, D R Young

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Abstract

The division between stripped-envelope supernovae (SE-SNe) and superluminous supernovae (SLSNe) is not well defined in either photometric or spectroscopic space. While a sharp luminosity threshold has been suggested, there remains an increasing number of transitional objects that reach this threshold without the spectroscopic signatures common to SLSNe. In this work we present data and analysis on four SNe transitional between SE-SNe and SLSNe; the He-poor SNe 2019dwa and 2019cri, and the He-rich SNe 2019hge and 2019unb. Each object displays long-lived and variable photometric evolution with luminosities around the SLSN threshold of Mr < −19.8 mag. Spectroscopically however, these objects are similar to SE-SNe, with line velocities lower than either SE-SNe and SLSNe, and thus represent an interesting case of rare transitional events.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Early online date05 Oct 2021
DOIs
Publication statusEarly online date - 05 Oct 2021

Keywords

  • Space and Planetary Science
  • Astronomy and Astrophysics

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