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On the nature of hydrogen-rich superluminous supernovae

On the nature of hydrogen-rich superluminous supernovae
On the nature of hydrogen-rich superluminous supernovae
We present two hydrogen-rich superluminous supernovae (SLSNe): SN2103hx and PS15br. These objects, together with SN2008es, are the only SLSNe showing a distinct, broad Ha feature during the photospheric phase; also, they show no sign of strong interaction between fast moving ejecta and circumstellar shells in their early spectra. Despite the fact that the peak luminosity of PS15br is fainter than that of the other two objects, the spectrophotometric evolution is similar to SN2103hx and different from any other supernova in a similar luminosity space. We group all of them as SLSNe II and hence they are distinct from the known class of SLSN IIn. Both transients show a strong, multicomponent Ha emission after 200 d past maximum, which we interpret as an indication of the interaction of the ejecta with an asymmetric, clumpy circumstellar material. The spectra and photometric evolution of the two objects are similar to Type II supernovae, although they have much higher luminosity and evolve on slower time-scales. This is qualitatively similar to how SLSNe I compare with normal type Ic, in that the former are brighter and evolve more slowly. We apply a magnetar and an interaction semi-analytical code to fit the light curves of our two objects and SN2008es. The overall observational data set would tend to favour the magnetar, or central engine, model as the source of the peak luminosity, although the clear signature of late-time interaction indicates that interaction can play a role in the luminosity evolution of SLSNe II at some phases.
Circumstellar matter, Stars: magnetars, Supernovae: general, Supernovae: individual: PS15br, Supernovae: individual: SN2008es, Supernovae: individual: SN2103hx
0035-8711
1046-1072
Inserra, C.
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Smartt, S.J.
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Gall, E.E.E.
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Leloudas, G.
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Chen, T.W.
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Schulze, S.
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Jerkstrand, A.
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Nicholl, M.
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Anderson, J.P.
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Arcavi, I.
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Benetti, S.
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Cartier, R.A.
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Childress, M.
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Della Valle, M.
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Flewelling, H.
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Fraser, M.
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Gal-Yam, A.
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Gutiérrez, C.P.
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Hosseinzadeh, G.
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Howell, D.A.
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Huber, M.
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Kankare, E.
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Krühler, T.
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Magnier, E.A.
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Maguire, K.
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McCully, C.
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Prajs, S.
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Primak, N.
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Scalzo, R.
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Schmidt, B.P.
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Smith, M.
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Smith, K.W.
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Tucker, B.E.
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Valenti, S.
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Wilman, M.
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Young, D.R.
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Yuan, F.
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Inserra, C.
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Smartt, S.J.
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Gall, E.E.E.
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Leloudas, G.
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Chen, T.W.
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Schulze, S.
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Jerkstrand, A.
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Nicholl, M.
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Anderson, J.P.
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Arcavi, I.
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Benetti, S.
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Cartier, R.A.
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Childress, M.
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Della Valle, M.
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Flewelling, H.
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Fraser, M.
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Gal-Yam, A.
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Gutiérrez, C.P.
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Hosseinzadeh, G.
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Howell, D.A.
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Huber, M.
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Kankare, E.
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Krühler, T.
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Magnier, E.A.
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Maguire, K.
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McCully, C.
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Prajs, S.
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Primak, N.
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Scalzo, R.
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Schmidt, B.P.
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Smith, M.
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Smith, K.W.
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Tucker, B.E.
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Valenti, S.
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Wilman, M.
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Young, D.R.
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Yuan, F.
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Inserra, C., Smartt, S.J., Gall, E.E.E., Leloudas, G., Chen, T.W., Schulze, S., Jerkstrand, A., Nicholl, M., Anderson, J.P., Arcavi, I., Benetti, S., Cartier, R.A., Childress, M., Della Valle, M., Flewelling, H., Fraser, M., Gal-Yam, A., Gutiérrez, C.P., Hosseinzadeh, G., Howell, D.A., Huber, M., Kankare, E., Krühler, T., Magnier, E.A., Maguire, K., McCully, C., Prajs, S., Primak, N., Scalzo, R., Schmidt, B.P., Smith, M., Smith, K.W., Tucker, B.E., Valenti, S., Wilman, M., Young, D.R. and Yuan, F. (2018) On the nature of hydrogen-rich superluminous supernovae. Monthly Notices of the Royal Astronomical Society, 475 (1), 1046-1072. (doi:10.1093/mnras/stx3179).

Record type: Article

Abstract

We present two hydrogen-rich superluminous supernovae (SLSNe): SN2103hx and PS15br. These objects, together with SN2008es, are the only SLSNe showing a distinct, broad Ha feature during the photospheric phase; also, they show no sign of strong interaction between fast moving ejecta and circumstellar shells in their early spectra. Despite the fact that the peak luminosity of PS15br is fainter than that of the other two objects, the spectrophotometric evolution is similar to SN2103hx and different from any other supernova in a similar luminosity space. We group all of them as SLSNe II and hence they are distinct from the known class of SLSN IIn. Both transients show a strong, multicomponent Ha emission after 200 d past maximum, which we interpret as an indication of the interaction of the ejecta with an asymmetric, clumpy circumstellar material. The spectra and photometric evolution of the two objects are similar to Type II supernovae, although they have much higher luminosity and evolve on slower time-scales. This is qualitatively similar to how SLSNe I compare with normal type Ic, in that the former are brighter and evolve more slowly. We apply a magnetar and an interaction semi-analytical code to fit the light curves of our two objects and SN2008es. The overall observational data set would tend to favour the magnetar, or central engine, model as the source of the peak luminosity, although the clear signature of late-time interaction indicates that interaction can play a role in the luminosity evolution of SLSNe II at some phases.

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On the nature of hydrogen-rich superluminous supernovae - Accepted Manuscript
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Accepted/In Press date: 4 December 2017
e-pub ahead of print date: 18 January 2018
Published date: 21 March 2018
Keywords: Circumstellar matter, Stars: magnetars, Supernovae: general, Supernovae: individual: PS15br, Supernovae: individual: SN2008es, Supernovae: individual: SN2103hx

Identifiers

Local EPrints ID: 418304
URI: https://eprints.soton.ac.uk/id/eprint/418304
ISSN: 0035-8711
PURE UUID: dff6abe8-06d3-475c-a3c8-10527126877d
ORCID for C. Inserra: ORCID iD orcid.org/0000-0002-3968-4409
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

Catalogue record

Date deposited: 27 Feb 2018 17:31
Last modified: 15 Aug 2019 00:33

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Contributors

Author: C. Inserra ORCID iD
Author: S.J. Smartt
Author: E.E.E. Gall
Author: G. Leloudas
Author: T.W. Chen
Author: S. Schulze
Author: A. Jerkstrand
Author: M. Nicholl
Author: J.P. Anderson
Author: I. Arcavi
Author: S. Benetti
Author: R.A. Cartier
Author: M. Childress
Author: M. Della Valle
Author: H. Flewelling
Author: M. Fraser
Author: A. Gal-Yam
Author: C.P. Gutiérrez
Author: G. Hosseinzadeh
Author: D.A. Howell
Author: M. Huber
Author: E. Kankare
Author: T. Krühler
Author: E.A. Magnier
Author: K. Maguire
Author: C. McCully
Author: S. Prajs
Author: N. Primak
Author: R. Scalzo
Author: B.P. Schmidt
Author: M. Smith ORCID iD
Author: K.W. Smith
Author: B.E. Tucker
Author: S. Valenti
Author: M. Wilman
Author: D.R. Young
Author: F. Yuan

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