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Title:Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm
Authors:Amanullah, Rahman (Author)
Petrushevska, Tanja (Author)
et al.
Files:This document has no files. This document may have a phisical copy in the library of the organization, check the status via COBISS. Link is opened in a new window
Language:English
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
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.
Keywords:circumstellar matter, supernovae: general, supernovae: individual: SNe 2012cg, supernovae: individual: 2012cu, dust, extinction
Year of publishing:2015
Number of pages:3300-3328
Numbering:453, 3
COBISS_ID:4996859 Link is opened in a new window
URN:URN:SI:UNG:REP:XRMJWST5
DOI:10.1093/mnras/stv1505 Link is opened in a new window
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Record is a part of a journal

Title:Monthly Notices of the Royal Astronomical Society
Publisher:Oxford University Press (OUP): Policy P - Oxford Open Option A
ISSN:0035-8711
Year of publishing:2015

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