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Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust

Brown, PJ; Smitka, MT; Wang, L; Breeveld, A; Pasquale, MD; Hartmann, DH; Krisciunas, K; ... Siegel, M; + view all (2015) Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust. Astrophysical Journal , 805 (1) , Article 74. 10.1088/0004-637X/805/1/74. Green open access

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Abstract

We present optical and ultraviolet (UV) photometry and spectra of the very nearby and highly reddened supernova (SN) 2014J in M82 obtained with the Swift Ultra-Violet/Optical Telescope (UVOT). Comparison of the UVOT grism spectra of SN~2014J with Hubble Space Telescope observations of SN2011fe or UVOT grism spectra of SN~2012fr are consistent with an extinction law with a low value of R_V~1.4. The high reddening causes the detected photon distribution in the broadband UV filters to have a much longer effective wavelength than for an unreddened SN. The light curve evolution is consistent with this shift and does not show a flattening due to photons being scattered back into the line of sight. The light curve shapes and color evolution are inconsistent with a contribution scattered into the line of sight by circumstellar dust. We conclude that most or all of the high reddening must come from interstellar dust. We show that even for a single dust composition, there is not a unique reddening law caused by circumstellar scattering. Rather, when considering scattering from a time-variable source, we confirm earlier studies that the reddening law is a function of the dust geometry, column density, and epoch. We also show how an assumed geometry of dust as a foreground sheet in mixed stellar/dust systems will lead to a higher inferred R_V. Rather than assuming the dust around SNe is peculiar, SNe may be useful probes of the interstellar reddening laws in other galaxies.

Type: Article
Title: Swift Ultraviolet Observations of Supernova 2014J in M82: Large Extinction from Interstellar Dust
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/0004-637X/805/1/74
Publisher version: http://dx.doi.org/10.1088/0004-637X/805/1/74
Language: English
Additional information: © 2015. The American Astronomical Society. All rights reserved.
Keywords: dust, extinction – supernovae: general – supernovae: individual (SN2014J, SN2011fe, SN2012fr)
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1449756
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