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1.	Amanullah, Rahman, et al. (author) Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm 2015 In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 453:3, s. 3300-3328 Journal article (peer-reviewed)abstract We present ultraviolet (UV) observations of six nearby Type Ia supernovae (SNe Ia) obtained with the Hubble Space Telescope, three of which were also observed in the near-IR (NIR) with Wide-Field Camera 3. UV observations with the Swift satellite, as well as ground-based optical and NIR data provide complementary information. The combined data set covers the wavelength range 0.2-2 mu m. By also including archival data of SN 2014J, we analyse a sample spanning observed colour excesses up to E(B - V) = 1.4 mag. We study the wavelength-dependent extinction of each individual SN and find a diversity of reddening laws when characterized by the total-to-selective extinction R-V. In particular, we note that for the two SNe with E(B - V) greater than or similar to 1 mag, for which the colour excess is dominated by dust extinction, we find R-V = 1.4 +/- 0.1 and R-V = 2.8 +/- 0.1. Adding UV photometry reduces the uncertainty of fitted R-V by similar to 50 per cent allowing us to also measure R-V of individual low-extinction objects which point to a similar diversity, currently not accounted for in the analyses when SNe Ia are used for studying the expansion history of the Universe.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Varenius, Eskil, 198 ... (1); Howell, D. A. (1); Cao, Y (1); Lundqvist, Peter (1); Nugent, P. (1); Elias-Rosa, N. (1); show more...; Fynbo, J. P. U. (1); Kankare, E. (1); Leloudas, G. (1); Mattila, S. (1); Östlin, Göran (1); Santos, P (1); Amanullah, Rahman (1); Ferretti, Raphael (1); Goobar, Ariel (1); Taddia, Francesco (1); Sullivan, M (1); Stanishev, V. (1); Dahle, H. (1); Johansson, Joel (1); Papadogiannakis, Sem ... (1); Petrushevska, Tanja (1); Brown, P. J. (1); Contreras, C. (1); Gorosabel, J. (1); Guaita, L. (1); Hangard, Laura (1); Hsiao, E. Y. (1); Kasliwal, M. (1); Phillips, M. M. (1); Sandberg, Andreas (1); Asadi, Saghar (1); Herrero-Illana, R. (1); Jensen, J. J. (1); Karhunen, K. (1); Lazarevic, S. (1); Sridhar, S. Seethapu ... (1); Wallström, Sofia, 19 ... (1); Wiegert, Joachim, 19 ... (1); show less...

University: Stockholm University (1); Chalmers University of Technology (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2015 (1)

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