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The lowest metallicity type II supernova from the highest mass red-supergiant progenitor

The lowest metallicity type II supernova from the highest mass red-supergiant progenitor
The lowest metallicity type II supernova from the highest mass red-supergiant progenitor
Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae1. However, while such stars are observed with masses >25 M⊙ (ref. 2), detections of >18 M⊙ progenitors remain elusive1. Red supergiants are also expected to form at all metallicities, but discoveries of explosions from low-metallicity progenitors are scarce. Here, we report observations of the type II supernova, SN 2015bs, for which we infer a progenitor metallicity of ≤0.1 Z⊙ from comparison to photospheric-phase spectral models3, and a zero-age main-sequence mass of 17–25 M⊙ through comparison to nebular-phase spectral models4,5. SN 2015bs displays a normal ‘plateau’ light-curve morphology, and typical spectral properties, implying a red supergiant progenitor. This is the first example of such a high-mass progenitor for a ‘normal’ type II supernova, suggesting a link between high-mass red supergiant explosions and low-metallicity progenitors.
2397-3366
Anderson, J.P.
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Dessart, L.
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Gutierrez, C.P.
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Krühler, T.
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Galbany, L.
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Jerkstrand, A.
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Smartt, S.J.
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Contreras, C.
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Morrell, N.
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Phillips, M.M.
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Stritzinger, M. D.
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Hsiao, E.Y.
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Gonzalez-Gaitan, S.
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Agliozzo, C.
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Castellon, S.
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Chambers, K.C.
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Chen, T.W.
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Flewelling, H.
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Gonzalez, C.
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Hosseinzadeh, G.
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Huber, M.
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Fraser, M.
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Inserra, C.
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Kankare, E.
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Mattila, S.
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Magnier, E.A.
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Maguire, K.
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Lowe, T.B.
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Sollerman, J.
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Sullivan, M.
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Young, D.R.
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Valenti, S.
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Anderson, J.P.
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Dessart, L.
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Gutierrez, C.P.
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Krühler, T.
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Galbany, L.
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Jerkstrand, A.
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Smartt, S.J.
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Contreras, C.
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Morrell, N.
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Phillips, M.M.
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Stritzinger, M. D.
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Hsiao, E.Y.
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Gonzalez-Gaitan, S.
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Agliozzo, C.
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Castellon, S.
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Chambers, K.C.
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Chen, T.W.
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Flewelling, H.
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Gonzalez, C.
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Hosseinzadeh, G.
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Huber, M.
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Fraser, M.
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Inserra, C.
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Kankare, E.
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Mattila, S.
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Magnier, E.A.
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Maguire, K.
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Lowe, T.B.
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Sollerman, J.
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Sullivan, M.
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Young, D.R.
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Valenti, S.
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Anderson, J.P., Dessart, L., Gutierrez, C.P., Krühler, T., Galbany, L., Jerkstrand, A., Smartt, S.J., Contreras, C., Morrell, N., Phillips, M.M., Stritzinger, M. D., Hsiao, E.Y., Gonzalez-Gaitan, S., Agliozzo, C., Castellon, S., Chambers, K.C., Chen, T.W., Flewelling, H., Gonzalez, C., Hosseinzadeh, G., Huber, M., Fraser, M., Inserra, C., Kankare, E., Mattila, S., Magnier, E.A., Maguire, K., Lowe, T.B., Sollerman, J., Sullivan, M., Young, D.R. and Valenti, S. (2018) The lowest metallicity type II supernova from the highest mass red-supergiant progenitor. Nature Astronomy. (doi:10.1038/s41550-018-0458-4).

Record type: Letter

Abstract

Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae1. However, while such stars are observed with masses >25 M⊙ (ref. 2), detections of >18 M⊙ progenitors remain elusive1. Red supergiants are also expected to form at all metallicities, but discoveries of explosions from low-metallicity progenitors are scarce. Here, we report observations of the type II supernova, SN 2015bs, for which we infer a progenitor metallicity of ≤0.1 Z⊙ from comparison to photospheric-phase spectral models3, and a zero-age main-sequence mass of 17–25 M⊙ through comparison to nebular-phase spectral models4,5. SN 2015bs displays a normal ‘plateau’ light-curve morphology, and typical spectral properties, implying a red supergiant progenitor. This is the first example of such a high-mass progenitor for a ‘normal’ type II supernova, suggesting a link between high-mass red supergiant explosions and low-metallicity progenitors.

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Accepted/In Press date: 4 April 2018
e-pub ahead of print date: 7 May 2018

Identifiers

Local EPrints ID: 420476
URI: https://eprints.soton.ac.uk/id/eprint/420476
ISSN: 2397-3366
PURE UUID: d2a4ec01-0199-4aae-9a67-2c82d6eedd09
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 08 May 2018 16:30
Last modified: 15 Jul 2019 17:22

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Contributors

Author: J.P. Anderson
Author: L. Dessart
Author: C.P. Gutierrez
Author: T. Krühler
Author: L. Galbany
Author: A. Jerkstrand
Author: S.J. Smartt
Author: C. Contreras
Author: N. Morrell
Author: M.M. Phillips
Author: M. D. Stritzinger
Author: E.Y. Hsiao
Author: S. Gonzalez-Gaitan
Author: C. Agliozzo
Author: S. Castellon
Author: K.C. Chambers
Author: T.W. Chen
Author: H. Flewelling
Author: C. Gonzalez
Author: G. Hosseinzadeh
Author: M. Huber
Author: M. Fraser
Author: C. Inserra ORCID iD
Author: E. Kankare
Author: S. Mattila
Author: E.A. Magnier
Author: K. Maguire
Author: T.B. Lowe
Author: J. Sollerman
Author: M. Sullivan ORCID iD
Author: D.R. Young
Author: S. Valenti

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