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

Rahman Amanullah; J. Johansson; A. Coobar; R. Ferretti; S. Papadogiannakis; T. Petrushevska; P.J. Brown; Y. Cao; C. Contreras; H. Dahle; N. Elias-Rosa; Johan Peter Uldall Fynbo; Jens Juel Jensen

doi:10.1093/mnras/stv1505

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

Rahman Amanullah, J. Johansson, A. Coobar, R. Ferretti, S. Papadogiannakis, T. Petrushevska, P.J. Brown, Y. Cao, C. Contreras, H. Dahle, N. Elias-Rosa, Johan Peter Uldall Fynbo, Jens Juel Jensen

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Abstract

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.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	453
Issue number	3
Pages (from-to)	3300-3328
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stv1505
Publication status	Published - 1 Nov 2015

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Amanullah, R., Johansson, J., Coobar, A., Ferretti, R., Papadogiannakis, S., Petrushevska, T., Brown, P. J., Cao, Y., Contreras, C., Dahle, H., Elias-Rosa, N., Fynbo, J. P. U., & Jensen, J. J. (2015). Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm. Monthly Notices of the Royal Astronomical Society, 453(3), 3300-3328. https://doi.org/10.1093/mnras/stv1505

Amanullah, R, Johansson, J, Coobar, A, Ferretti, R, Papadogiannakis, S, Petrushevska, T, Brown, PJ, Cao, Y, Contreras, C, Dahle, H, Elias-Rosa, N, Fynbo, JPU & Jensen, JJ 2015, 'Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm', Monthly Notices of the Royal Astronomical Society, vol. 453, no. 3, pp. 3300-3328. https://doi.org/10.1093/mnras/stv1505

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title = "Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm",

abstract = "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.",

author = "Rahman Amanullah and J. Johansson and A. Coobar and R. Ferretti and S. Papadogiannakis and T. Petrushevska and P.J. Brown and Y. Cao and C. Contreras and H. Dahle and N. Elias-Rosa and Fynbo, {Johan Peter Uldall} and Jensen, {Jens Juel}",

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T1 - Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm

AU - Amanullah, Rahman

AU - Johansson, J.

AU - Coobar, A.

AU - Ferretti, R.

AU - Papadogiannakis, S.

AU - Petrushevska, T.

AU - Brown, P.J.

AU - Cao, Y.

AU - Contreras, C.

AU - Dahle, H.

AU - Elias-Rosa, N.

AU - Fynbo, Johan Peter Uldall

AU - Jensen, Jens Juel

PY - 2015/11/1

Y1 - 2015/11/1

N2 - 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.

AB - 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.

U2 - 10.1093/mnras/stv1505

DO - 10.1093/mnras/stv1505

M3 - Journal article

SN - 0035-8711

VL - 453

SP - 3300

EP - 3328

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 3

ER -

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

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