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.

supernovae: individual: 2012cu

supernovae: general

circumstellar matter

extinction

dust

supernovae: individual: SNe 2012cg

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 and M University

Y. Cao

CalTech

C. Contreras

Las Campanas Observatory

H. Dahle

Universitetet i Oslo

N. Elias-Rosa

Osservatorio Astronomico di Padova

J.P.U. Fynbo

Niels Bohr Institute

J. Gorosabel

Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia

CSIC - Instituto de Astrofísica de Andalucía (IAA)

L. Guaita

Osservatorio Astronomico di Roma

L. Hangard

Stockholms universitet

D.A. Howell

University of California

Las Cumbres Observatory Global Telescope Network, Inc

E.Y. Hsiao

Aarhus Universitet

Las Campanas Observatory

E. Kankare

Queen's University Belfast

M. Kasliwal

Carnegie Observatories

G. Leloudas

Niels Bohr Institute

Weizmann Institute of Science Israel

P. Lundqvist

Stockholms universitet

S. Mattila

Turun yliopisto

P. Nugent

University of California

Lawrence Berkeley National Laboratory

M.M. Phillips

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

CSIC - Instituto de Astrofísica 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)

University of Groningen, Kapteyn Astronomical Institute

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 3300-3328

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1093/mnras/stv1505