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Observed Type Ii Supernova Colours From The Carnegie Supernova Project-i

Title: Observed Type Ii Supernova Colours From The Carnegie Supernova Project-i.
Name(s): de Jaeger, T., author
Anderson, J. P., author
Galbany, L., author
Gonzalez-Gaitan, S., author
Hamuy, M., author
Phillips, M. M., author
Stritzinger, M. D., author
Contreras, C., author
Folatelli, G., author
Gutierrez, C. P., author
Hsiao, E. Y., author
Morrell, N., author
Suntzeff, N. B., author
Dessart, L., author
Filippenko, A. V., author
Type of Resource: text
Genre: Journal Article
Journal Article
Date Issued: 2018-06-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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 (s1, colour) is steeper and has a median duration of similar to 40 d. The second, shallower slope (s2, colour) lasts until the end of the 'plateau' (similar to 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 host-galaxy 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.
Identifier: FSU_libsubv1_wos_000432659800023 (IID), 10.1093/mnras/sty508 (DOI)
Keywords: supernovae: general, dust, extinction, expanding photosphere method, k-corrections, p supernovae, plateau supernovae, large-magellanic-cloud, light curves, dust formation, hubble diagram, sn 1999em, standardized candle method
Publication Note: The publisher’s version of record is available at
Persistent Link to This Record:
Owner Institution: FSU
Is Part Of: Monthly Notices of the Royal Astronomical Society.
Issue: iss. 4, vol. 476

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De Jaeger, T., Anderson, J. P., Galbany, L., Gonzalez-Gaitan, S., Hamuy, M., Phillips, M. M., … Filippenko, A. V. (2018). Observed Type Ii Supernova Colours From The Carnegie Supernova Project-i. Monthly Notices Of The Royal Astronomical Society. Retrieved from