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Title: SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST

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{sub 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 (LOS). The light curve shapes and color evolution are inconsistent with a contribution scattered into the LOS 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 alsomore » show how an assumed geometry of dust as a foreground sheet in mixed stellar/dust systems will lead to a higher inferred R{sub V}. Rather than assuming the dust around SNe is peculiar, SNe may be useful probes of the interstellar reddening laws in other galaxies.« less

Authors:
; ; ;  [1]; ; ;  [2];  [3];  [4];  [5];  [6]
  1. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, Texas A. and M. University, Department of Physics and Astronomy, 4242 TAMU, College Station, TX 77843 (United States)
  2. Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking Surrey, RH5 6NT (United Kingdom)
  3. Instituto di Astrofisica Spaziale e Fisica Cosmica di Palermo Via Ugo la Malfa 153 90146 Palermo (Italy)
  4. Clemson University, Department of Physics and Astronomy, Kinard Lab of Physics, Clemson, SC 29634-0978 (United States)
  5. Steward Observatory, University of Arizona, Tucson, AZ 85719 (United States)
  6. Department of Astronomy and Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802 (United States)
Publication Date:
OSTI Identifier:
22522394
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 805; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; COMPARATIVE EVALUATIONS; COSMIC DUST; DENSITY; EMISSION SPECTRA; GALAXIES; INTERSTELLAR SPACE; PHOTOMETRY; PROBES; SCATTERING; SHEETS; SPACE; SUPERNOVAE; TELESCOPES; ULTRAVIOLET RADIATION; VISIBLE RADIATION

Citation Formats

Brown, Peter J., Smitka, Michael T., Wang, Lifan, Krisciunas, Kevin, Breeveld, Alice, Kuin, N. Paul, Page, Mat, De Pasquale, Massimiliano, Hartmann, Dieter H., Milne, Peter A., and Siegel, Michael. SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST. United States: N. p., 2015. Web. doi:10.1088/0004-637X/805/1/74.
Brown, Peter J., Smitka, Michael T., Wang, Lifan, Krisciunas, Kevin, Breeveld, Alice, Kuin, N. Paul, Page, Mat, De Pasquale, Massimiliano, Hartmann, Dieter H., Milne, Peter A., & Siegel, Michael. SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST. United States. doi:10.1088/0004-637X/805/1/74.
Brown, Peter J., Smitka, Michael T., Wang, Lifan, Krisciunas, Kevin, Breeveld, Alice, Kuin, N. Paul, Page, Mat, De Pasquale, Massimiliano, Hartmann, Dieter H., Milne, Peter A., and Siegel, Michael. Wed . "SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST". United States. doi:10.1088/0004-637X/805/1/74.
@article{osti_22522394,
title = {SWIFT ULTRAVIOLET OBSERVATIONS OF SUPERNOVA 2014J IN M82: LARGE EXTINCTION FROM INTERSTELLAR DUST},
author = {Brown, Peter J. and Smitka, Michael T. and Wang, Lifan and Krisciunas, Kevin and Breeveld, Alice and Kuin, N. Paul and Page, Mat and De Pasquale, Massimiliano and Hartmann, Dieter H. and Milne, Peter A. and Siegel, Michael},
abstractNote = {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{sub 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 (LOS). The light curve shapes and color evolution are inconsistent with a contribution scattered into the LOS 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{sub V}. Rather than assuming the dust around SNe is peculiar, SNe may be useful probes of the interstellar reddening laws in other galaxies.},
doi = {10.1088/0004-637X/805/1/74},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 805,
place = {United States},
year = {2015},
month = {5}
}