| Title: | Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm |
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| Authors: | ID Amanullah, Rahman, Oskar Klein Centre, Physics Department, Stockholm University, SE-106 91 Stockholm, Sweden (Author)
ID Petrushevska, Tanja, Oskar Klein Centre, Physics Department, Stockholm University, SE-106 91 Stockholm, Sweden (Author), et al. |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| 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 μm. 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 RV. In particular, we note that for the two SNe with E(B − V) ≳ 1 mag, for which the colour excess is dominated by dust extinction, we find RV = 1.4 ± 0.1 and RV = 2.8 ± 0.1. Adding UV photometry reduces the uncertainty of fitted RV by ∼50 per cent allowing us to also measure RV 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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| Keywords: | circumstellar matter, supernovae: general, supernovae: individual: SNe 2012cg, supernovae: individual: 2012cu, dust, extinction |
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| Publication version: | Version of Record |
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| Year of publishing: | 2015 |
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| Number of pages: | 3300-3328 |
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| Numbering: | 3, 453 |
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| PID: | 20.500.12556/RUNG-3566-0793b3c1-b6c4-20fb-0132-516ab7016121 |
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| COBISS.SI-ID: | 4996859 |
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| DOI: | 10.1093/mnras/stv1505 |
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| NUK URN: | URN:SI:UNG:REP:XRMJWST5 |
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| Publication date in RUNG: | 23.01.2018 |
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| Views: | 4353 |
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| Downloads: | 0 |
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