Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 453, Issue 3, Pages 3300-3328Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1505
Keywords
circumstellar matter; supernovae: general; supernovae: individual: SNe 2012cg; supernovae: individual: 2012cu; dust, extinction
Categories
Funding
- Swedish Research Council
- Swedish Space Board
- NASA's Astrophysics Data Analysis Program [NNX13AF35G]
- FCT - Fundacao para a Ciencia e Tecnologia [SFRH/BD/62075/2009]
- Fundacao para a Ciencia e a Tecnologia
- European Union [267251]
- Danish Agency for Science and Technology and Innovation through a Sapere Aude Level 2 grant
- DNRF
- European Research Council under the European Union [EGGS-278202]
- National Aeronautics and Space Administration
- [PTDC/CTE-AST/112582/2009]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/62075/2009, PTDC/CTE-AST/112582/2009] Funding Source: FCT
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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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