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Type II supernovae in low-luminosity host galaxies

Type II supernovae in low-luminosity host galaxies
Type II supernovae in low-luminosity host galaxies

We present an analysis of a new sample of type II core-collapse supernovae (SNe II) occurring within low-luminosity galaxies, comparing these with a sample of events in brighter hosts. Our analysis is performed comparing SN II spectral and photometric parameters and estimating the influence of metallicity (inferred from host luminosity differences) on SN II transient properties. We measure the SN absolute magnitude at maximum, the light-curve plateau duration, the optically thick duration, and the plateau decline rate in the V band, together with expansion velocities and pseudo-equivalent-widths (pEWs) of several absorption lines in the SN spectra. For the SN host galaxies, we estimate the absolute magnitude and the stellar mass, a proxy for the metallicity of the host galaxy. SNe II exploding in low-luminosity galaxies display weaker pEWs of Fe II λ5018, confirming the theoretical prediction that metal lines in SN II spectra should correlate with metallicity.We also find that SNe II in low-luminosity hosts have generally slower declining light curves and display weaker absorption lines. We find no relationship between the plateau duration or the expansion velocities with SN environment, suggesting that the hydrogen envelope mass and the explosion energy are not correlated with the metallicity of the host galaxy. This result supports recent predictions that mass-loss for red supergiants is independent of metallicity.

Galaxies: general, Supernovae: general
0035-8711
3232-3253
Gutiérrez, C. P.
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Anderson, J. P.
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Sullivan, M.
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Dessart, L.
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González-Gaitan, S.
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Galbany, L.
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Dimitriadis, G.
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Arcavi, I.
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Bufano, F.
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Chen, T. W.
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Dennefeld, M.
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Gromadzki, M.
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Haislip, J. B.
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Hosseinzadeh, G.
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Howell, D. A.
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Inserra, C.
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Kankare, E.
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Leloudas, G.
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Maguire, K.
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McCully, C.
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Morrell, N.
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Olivares, E. F.
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Pignata, G.
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Reichart, D. E.
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Reynolds, T.
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Smartt, S. J.
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Sollerman, J.
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Taddia, F.
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Takáts, K.
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Terreran, G.
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Valenti, S.
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Young, D. R.
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Gutiérrez, C. P.
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Anderson, J. P.
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Sullivan, M.
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Dessart, L.
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González-Gaitan, S.
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Galbany, L.
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Dimitriadis, G.
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Arcavi, I.
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Bufano, F.
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Chen, T. W.
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Dennefeld, M.
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Gromadzki, M.
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Haislip, J. B.
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Hosseinzadeh, G.
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Howell, D. A.
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Inserra, C.
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Kankare, E.
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Leloudas, G.
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Maguire, K.
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McCully, C.
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Morrell, N.
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Olivares, E. F.
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Pignata, G.
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Reichart, D. E.
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Reynolds, T.
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Smartt, S. J.
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Sollerman, J.
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Taddia, F.
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Takáts, K.
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Terreran, G.
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Valenti, S.
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Young, D. R.
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Gutiérrez, C. P., Anderson, J. P., Sullivan, M., Dessart, L., González-Gaitan, S., Galbany, L., Dimitriadis, G., Arcavi, I., Bufano, F., Chen, T. W., Dennefeld, M., Gromadzki, M., Haislip, J. B., Hosseinzadeh, G., Howell, D. A., Inserra, C., Kankare, E., Leloudas, G., Maguire, K., McCully, C., Morrell, N., Olivares, E. F., Pignata, G., Reichart, D. E., Reynolds, T., Smartt, S. J., Sollerman, J., Taddia, F., Takáts, K., Terreran, G., Valenti, S. and Young, D. R. (2018) Type II supernovae in low-luminosity host galaxies. Monthly Notices of the Royal Astronomical Society, 479 (3), 3232-3253. (doi:10.1093/mnras/sty1581).

Record type: Article

Abstract

We present an analysis of a new sample of type II core-collapse supernovae (SNe II) occurring within low-luminosity galaxies, comparing these with a sample of events in brighter hosts. Our analysis is performed comparing SN II spectral and photometric parameters and estimating the influence of metallicity (inferred from host luminosity differences) on SN II transient properties. We measure the SN absolute magnitude at maximum, the light-curve plateau duration, the optically thick duration, and the plateau decline rate in the V band, together with expansion velocities and pseudo-equivalent-widths (pEWs) of several absorption lines in the SN spectra. For the SN host galaxies, we estimate the absolute magnitude and the stellar mass, a proxy for the metallicity of the host galaxy. SNe II exploding in low-luminosity galaxies display weaker pEWs of Fe II λ5018, confirming the theoretical prediction that metal lines in SN II spectra should correlate with metallicity.We also find that SNe II in low-luminosity hosts have generally slower declining light curves and display weaker absorption lines. We find no relationship between the plateau duration or the expansion velocities with SN environment, suggesting that the hydrogen envelope mass and the explosion energy are not correlated with the metallicity of the host galaxy. This result supports recent predictions that mass-loss for red supergiants is independent of metallicity.

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Type II supernovae in low luminosity host galaxies - Accepted Manuscript
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Accepted/In Press date: 7 June 2018
e-pub ahead of print date: 15 June 2018
Published date: 21 September 2018
Keywords: Galaxies: general, Supernovae: general

Identifiers

Local EPrints ID: 421865
URI: https://eprints.soton.ac.uk/id/eprint/421865
ISSN: 0035-8711
PURE UUID: 5fc44841-96f5-47e4-b94b-941f3625cfa1
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409

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Date deposited: 03 Jul 2018 16:30
Last modified: 14 Mar 2019 01:35

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Contributors

Author: C. P. Gutiérrez
Author: J. P. Anderson
Author: M. Sullivan ORCID iD
Author: L. Dessart
Author: S. González-Gaitan
Author: L. Galbany
Author: G. Dimitriadis
Author: I. Arcavi
Author: F. Bufano
Author: T. W. Chen
Author: M. Dennefeld
Author: M. Gromadzki
Author: J. B. Haislip
Author: G. Hosseinzadeh
Author: D. A. Howell
Author: C. Inserra ORCID iD
Author: E. Kankare
Author: G. Leloudas
Author: K. Maguire
Author: C. McCully
Author: N. Morrell
Author: E. F. Olivares
Author: G. Pignata
Author: D. E. Reichart
Author: T. Reynolds
Author: S. J. Smartt
Author: J. Sollerman
Author: F. Taddia
Author: K. Takáts
Author: G. Terreran
Author: S. Valenti
Author: D. R. Young

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