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Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm

R. Amanullah ; J. Johansson ; A. Goobar ; R. Ferretti ; S. Papadogiannakis ; T. Petrushevska ; P.J. Brown ; Y. Cao ; C. Contreras ; H. Dahle ; N. Elias-Rosa ; J.P.U. Fynbo ; J. Gorosabel ; L. Guaita ; L. Hangard ; D.A. Howell ; E.Y. Hsiao ; E. Kankare ; M. Kasliwal ; G. Leloudas ; P. Lundqvist ; S. Mattila ; P. Nugent ; M.M. Phillips ; A. Sandberg ; V. Stanishev ; M. Sullivan ; F. Taddia ; G. Östlin ; S. Asadi ; R. Herrero-Illana ; J.J. Jensen ; K. Karhunen ; S. Lazarevic ; Eskil Varenius (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; P. Santos ; S. Seethapuram Sridhar ; Sofia Wallström (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Joachim Wiegert (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik)
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 453 (2015), 3, p. 3300-3328.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: circumstellar matter; supernovae: general; supernovae: individual: SNe 2012cg; supernovae: individual: 2012cu; dust, extinction

Denna post skapades 2015-11-13. Senast ändrad 2015-12-07.
CPL Pubid: 225725


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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)



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