Refereed journal article or data article (A1)
Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae
List of Authors: Prentice SJ, Inserra C, Schulze S, Nicholl M, Mazzali PA, Vergani SD, Galbany L, Anderson JP, Ashall C, Chen TW, Deckers M, Mancheno MD, Diaz RG, Gonzalez-Gaitan S, Gromadzki M, Gutierrez CP, Harvey L, Kozyreva A, Magee MR, Maguire K, Muller-Bravo TE, Torres SM, Pessi PJ, Sollerman J, Teffs J, Terwel JH, Young DR
Publisher: OXFORD UNIV PRESS
Publication year: 2021
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Article number: stab2864
Volume number: 508
Issue number: 3
Start page: 4342
End page: 4358
Number of pages: 17
ISSN: 0035-8711
eISSN: 1365-2966
DOI: http://dx.doi.org/10.1093/mnras/stab2864
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/68415137
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 M-r < -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.
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