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
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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1 June 2018
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., 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), .
(doi:10.1093/mnras/sty508).
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.
Text
Observed Type II supernova colours from the Carnegie Supernova Project-I
- Accepted Manuscript
More information
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
Identifiers
Local EPrints ID: 420333
URI: http://eprints.soton.ac.uk/id/eprint/420333
ISSN: 1365-2966
PURE UUID: b4c068fa-21f0-4937-ac75-c74a64a5ef21
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Date deposited: 04 May 2018 16:30
Last modified: 17 May 2024 17:37
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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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