Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm
Artikel i vetenskaplig tidskrift, 2015
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.
circumstellar matter
extinction
supernovae: individual: 2012cu
supernovae: general
supernovae: individual: SNe 2012cg
dust
Författare
R. Amanullah
Stockholms universitet
J. Johansson
Stockholms universitet
A. Goobar
Stockholms universitet
R. Ferretti
Stockholms universitet
S. Papadogiannakis
Stockholms universitet
T. Petrushevska
Stockholms universitet
P.J. Brown
Texas A&M University
Y. Cao
California Institute of Technology (Caltech)
C. Contreras
Las Campanas Observatory
H. Dahle
Universitetet i Oslo
N. Elias-Rosa
Istituto nazionale di astrofisica (INAF)
J.P.U. Fynbo
Niels Bohr Institute
J. Gorosabel
Instituto de Astrofisica de Andalucía (IAA)
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
L. Guaita
Osservatorio Astronomico di Roma
L. Hangard
Stockholms universitet
D.A. Howell
Las Cumbres Observatory Global Telescope Network
University of California
E.Y. Hsiao
Las Campanas Observatory
Aarhus Universitet
E. Kankare
Queen's University Belfast
M. Kasliwal
Carnegie Observatories
G. Leloudas
Niels Bohr Institute
Weizmann Institute of Science
P. Lundqvist
Stockholms universitet
S. Mattila
Turun Yliopisto
P. Nugent
University of California
Lawrence Berkeley National Laboratory
M.M. Phillips
California Institute of Technology (Caltech)
A. Sandberg
Stockholms universitet
V. Stanishev
Instituto Superior Tecnico
M. Sullivan
University of Southampton
F. Taddia
Stockholms universitet
G. Östlin
Stockholms universitet
S. Asadi
Stockholms universitet
R. Herrero-Illana
Instituto de Astrofisica de Andalucía (IAA)
J.J. Jensen
Niels Bohr Institute
K. Karhunen
Tuorla Observatory
S. Lazarevic
Univerzitet u Beogradu
Eskil Varenius
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
P. Santos
Universitetet i Oslo
S. Seethapuram Sridhar
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
Sofia Wallström
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
Joachim Wiegert
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 453 3 3300-3328Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1093/mnras/stv1505