Details

Autor(en) / Beteiligte

• Amanullah, R
• Johansson, J
• Goobar, A
• Ferretti, R
• Papadogiannakis, S
• Petrushevska, T
• Brown, P. J
• Cao, Y
• Contreras, C
• Dahle, H
• Elias-Rosa, N
• Fynbo, J. P. U
• Gorosabel, J
• Guaita, L
• Hangard, L
• Howell, D. A
• Hsiao, E. Y
• Kankare, E
• Kasliwal, M
• Leloudas, G
• Lundqvist, P
• Mattila, S
• Nugent, P
• Phillips, M. M
• Sandberg, A
• Stanishev, V
• Sullivan, M
• Taddia, F
• Östlin, G
• Asadi, S
• Herrero-Illana, R
• Jensen, J. J
• Karhunen, K
• Lazarevic, S
• Varenius, E
• Santos, P
• Sridhar, S. Seethapuram
• Wallström, S. H. J
• Wiegert, J

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2015, Vol.453 (3), p.3300-3328

Ort / Verlag

United States: Oxford University Press

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 R V . 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 R V  = 1.4 ± 0.1 and R V  = 2.8 ± 0.1. Adding UV photometry reduces the uncertainty of fitted R V by ∼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.