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Observed Type II supernova colours from the Carnegie Supernova Project-I

Observed Type II supernova colours from the Carnegie Supernova Project-I
Observed Type II supernova colours from the Carnegie Supernova Project-I

We present a study of observed Type II supernova (SN II) colours using optical/near-infrared photometric data from the Carnegie Supernovae Project-I. We analyse four colours (B - V, u - g, g - r, and g - Y) and find that SN II colour curves can be described by two linear regimes during the photospheric phase. The first (s, 1colour) is steeper and has a median duration of ~40 d. The second, shallower slope (s, 2colour) lasts until the end of the 'plateau' (~80 d). The two slopes correlate in the sense that steeper initial colour curves also imply steeper colour curves at later phases. As suggested by recent studies, SNe II form a continuous population of objects from the colour point of view as well. We investigate correlations between the observed colours and a range of photometric and spectroscopic parameters including the absolute magnitude, the V-band light-curve slopes, and metal-line strengths. We find that less luminous SNe II appear redder, a trend that we argue is not driven by uncorrected hostgalaxy reddening. While there is significant dispersion, we find evidence that redder SNe II (mainly at early epochs) display stronger metal-line equivalent widths. Host-galaxy reddening does not appear to be a dominant parameter, neither driving observed trends nor dominating the dispersion in observed colours. Intrinsic SN II colours are most probably dominated by photospheric temperature differences, with progenitor metallicity possibly playing a minor role. Such temperature differences could be related to differences in progenitor radius, together with the presence or absence of circumstellar material close to the progenitor stars.

Dust, Extinction, Supernovae: general
0035-8711
4592-4616
de Jaeger, T.
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Anderson, J.P.
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Galbany, L.
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González-Gaitán, S.
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Hamuy, M.
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Phillips, M.M.
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Stritzinger, M.D.
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Contreras, C.
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Folatelli, G.
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Gutiérrez, C.P.
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Hsiao, E.Y.
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Morrell, N.
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Suntzeff, N.B.
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Dessart, L.
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Filippenko, A.V.
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de Jaeger, T.
e45519a3-dfd2-4cbc-8a82-afd29f84d357
Anderson, J.P.
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Galbany, L.
76c0f594-2419-43d1-8c38-6429ecad4a03
González-Gaitán, S.
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Hamuy, M.
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Phillips, M.M.
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Stritzinger, M.D.
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Contreras, C.
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Folatelli, G.
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Gutiérrez, C.P.
14464da3-b453-4980-bff2-b22afa4b4366
Hsiao, E.Y.
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Morrell, N.
c04ca685-6c6c-49eb-86fe-3f9b16230515
Suntzeff, N.B.
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Dessart, L.
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Filippenko, A.V.
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de Jaeger, T., Anderson, J.P., Galbany, L., González-Gaitán, S., Hamuy, M., Phillips, M.M., Stritzinger, M.D., Contreras, C., Folatelli, G., Gutiérrez, C.P., Hsiao, E.Y., Morrell, N., Suntzeff, N.B., Dessart, L. and Filippenko, A.V. (2018) Observed Type II supernova colours from the Carnegie Supernova Project-I. Monthly Notices of the Royal Astronomical Society, 476 (4), 4592-4616. (doi:10.1093/mnras/sty508).

Record type: Article

Abstract

We present a study of observed Type II supernova (SN II) colours using optical/near-infrared photometric data from the Carnegie Supernovae Project-I. We analyse four colours (B - V, u - g, g - r, and g - Y) and find that SN II colour curves can be described by two linear regimes during the photospheric phase. The first (s, 1colour) is steeper and has a median duration of ~40 d. The second, shallower slope (s, 2colour) lasts until the end of the 'plateau' (~80 d). The two slopes correlate in the sense that steeper initial colour curves also imply steeper colour curves at later phases. As suggested by recent studies, SNe II form a continuous population of objects from the colour point of view as well. We investigate correlations between the observed colours and a range of photometric and spectroscopic parameters including the absolute magnitude, the V-band light-curve slopes, and metal-line strengths. We find that less luminous SNe II appear redder, a trend that we argue is not driven by uncorrected hostgalaxy reddening. While there is significant dispersion, we find evidence that redder SNe II (mainly at early epochs) display stronger metal-line equivalent widths. Host-galaxy reddening does not appear to be a dominant parameter, neither driving observed trends nor dominating the dispersion in observed colours. Intrinsic SN II colours are most probably dominated by photospheric temperature differences, with progenitor metallicity possibly playing a minor role. Such temperature differences could be related to differences in progenitor radius, together with the presence or absence of circumstellar material close to the progenitor stars.

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Observed Type II supernova colours from the Carnegie Supernova Project-I - Accepted Manuscript
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Accepted/In Press date: 17 February 2018
e-pub ahead of print date: 24 February 2018
Published date: 1 June 2018
Keywords: Dust, Extinction, Supernovae: general

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Local EPrints ID: 420333
URI: http://eprints.soton.ac.uk/id/eprint/420333
ISSN: 0035-8711
PURE UUID: b4c068fa-21f0-4937-ac75-c74a64a5ef21

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Date deposited: 04 May 2018 16:30
Last modified: 16 Dec 2019 18:15

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Contributors

Author: T. de Jaeger
Author: J.P. Anderson
Author: L. Galbany
Author: S. González-Gaitán
Author: M. Hamuy
Author: M.M. Phillips
Author: M.D. Stritzinger
Author: C. Contreras
Author: G. Folatelli
Author: C.P. Gutiérrez
Author: E.Y. Hsiao
Author: N. Morrell
Author: N.B. Suntzeff
Author: L. Dessart
Author: A.V. Filippenko

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