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.
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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-pp.ucl.ac.uk/id/eprint/1449756 |
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