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

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

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.

supernovae: general
1365-2966
4342–4358
Muller Bravo, Tomas, Enrique
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Prentice, S. J.
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Inserra, C.
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Schulze, S.
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Nicholl, M.
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Mazzali, P.A.
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Vergani, S. D.
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Galbany, L.
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Anderson, J.P.
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Ashall, C.
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Chen, T. W.
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Deckers, M.
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Delgado Mancheño, M.
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González Díaz, R.
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González-Gaitán, S.
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Gromadzki, M.
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Gutiérrez, C. P.
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Harvey, L.
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Kozyreva, A.
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Magee, M.R.
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Maguire, K.
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Muñoz Torres, S.
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Pessi, P.J.
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Sollerman, J.
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Teffs, J.
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Terwel, J. H.
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Young, D. R.
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Muller Bravo, Tomas, Enrique
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Prentice, S. J.
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Inserra, C.
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Schulze, S.
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Nicholl, M.
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Mazzali, P.A.
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Vergani, S. D.
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Galbany, L.
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Anderson, J.P.
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Ashall, C.
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Chen, T. W.
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Deckers, M.
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Delgado Mancheño, M.
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González Díaz, R.
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González-Gaitán, S.
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Gromadzki, M.
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Gutiérrez, C. P.
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Harvey, L.
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Kozyreva, A.
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Magee, M.R.
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Maguire, K.
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Muñoz Torres, S.
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Pessi, P.J.
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Sollerman, J.
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Teffs, J.
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Terwel, J. H.
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Young, D. R.
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Muller Bravo, Tomas, Enrique, Prentice, S. J., Inserra, C., Schulze, S., Nicholl, M., Mazzali, P.A., Vergani, S. D., Galbany, L., Anderson, J.P., Ashall, C., Chen, T. W., Deckers, M., Delgado Mancheño, M., González Díaz, R., González-Gaitán, S., Gromadzki, M., Gutiérrez, C. P., Harvey, L., Kozyreva, A., Magee, M.R., Maguire, K., Muñoz Torres, S., Pessi, P.J., Sollerman, J., Teffs, J., Terwel, J. H. and Young, D. R. (2021) Transitional events in the spectrophotometric regime between stripped envelope and superluminous supernovae. Monthly Notices of the Royal Astronomical Society, 508 (3), 4342–4358. (doi:10.1093/mnras/stab2864).

Record type: Article

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.

Text
2109.14572 - Accepted Manuscript
Available under License University of Southampton Accepted Manuscript Licence.
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More information

Accepted/In Press date: 29 September 2021
e-pub ahead of print date: 5 November 2021
Published date: 1 December 2021
Additional Information: Publisher Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords: supernovae: general
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Identifiers

Local EPrints ID: 453221
URI: http://eprints.soton.ac.uk/id/eprint/453221
DOI: doi:10.1093/mnras/stab2864
ISSN: 1365-2966
PURE UUID: 5f27dcc6-6cfd-4c77-bcac-974f6708f1d4

Catalogue record

Date deposited: 11 Jan 2022 17:39
Last modified: 16 Mar 2024 15:13

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Contributors

Author: Tomas, Enrique Muller Bravo
Author: S. J. Prentice
Author: C. Inserra
Author: S. Schulze
Author: M. Nicholl
Author: P.A. Mazzali
Author: S. D. Vergani
Author: L. Galbany
Author: J.P. Anderson
Author: C. Ashall
Author: T. W. Chen
Author: M. Deckers
Author: M. Delgado Mancheño
Author: R. González Díaz
Author: S. González-Gaitán
Author: M. Gromadzki
Author: C. P. Gutiérrez
Author: L. Harvey
Author: A. Kozyreva
Author: M.R. Magee
Author: K. Maguire
Author: S. Muñoz Torres
Author: P.J. Pessi
Author: J. Sollerman
Author: J. Teffs
Author: J. H. Terwel
Author: D. R. Young

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