Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm
Journal article, 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.

dust

supernovae: individual: SNe 2012cg

extinction

supernovae: general

supernovae: individual: 2012cu

circumstellar matter

Author

R. Amanullah

Stockholm University

J. Johansson

Stockholm University

A. Goobar

Stockholm University

R. Ferretti

Stockholm University

S. Papadogiannakis

Stockholm University

T. Petrushevska

Stockholm University

P.J. Brown

Texas A&M University

Y. Cao

California Institute of Technology (Caltech)

C. Contreras

Las Campanas Observatory

H. Dahle

University of Oslo

N. Elias-Rosa

Osservatorio Astronomico di Padova

J.P.U. Fynbo

Niels Bohr Institute

J. Gorosabel

University of the Basque Country (UPV/EHU)

CSIC - Instituto de Astrofísica de Andalucía (IAA)

L. Guaita

Osservatorio Astronomico di Roma

L. Hangard

Stockholm University

D.A. Howell

University of California

Las Cumbres Observatory Global Telescope Network, Inc

E.Y. Hsiao

Aarhus University

Las Campanas Observatory

E. Kankare

Queen's University Belfast

M. Kasliwal

Carnegie Observatories

G. Leloudas

Weizmann Institute of Science

Niels Bohr Institute

P. Lundqvist

Stockholm University

S. Mattila

University of Turku

P. Nugent

Lawrence Berkeley National Laboratory

University of California

M.M. Phillips

California Institute of Technology (Caltech)

A. Sandberg

Stockholm University

V. Stanishev

Instituto Superior Tecnico

M. Sullivan

University of Southampton

F. Taddia

Stockholm University

G. Östlin

Stockholm University

S. Asadi

Stockholm University

R. Herrero-Illana

CSIC - Instituto de Astrofísica de Andalucía (IAA)

J.J. Jensen

Niels Bohr Institute

K. Karhunen

Tuorla Observatory

S. Lazarevic

University of Belgrade

Eskil Varenius

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

P. Santos

University of Oslo

S. Seethapuram Sridhar

University of Groningen

Netherlands Institute for Radio Astronomy (ASTRON)

Sofia Wallström

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

Joachim Wiegert

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 453 3 3300-3328

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1093/mnras/stv1505

More information

Latest update

11/22/2018