J/ApJ/805/74ivo://CDS.VizieR/J/ApJ/805/74doi:10.26093/cds/vizier.18050074CDSBrown P.J.Smitka M.T.Wang L.Breeveld A.de Pasquale M.,Hartmann D.H.Krisciunas K.Kuin N.P.Milne P.A.Page M.Siegel M.2017-06-30T05:48:46Z2015-10-08T14:25:55ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvisible-astronomybroad-band-photometryultraviolet-photometrysupernovaeWe 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 (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_V_. Rather than assuming the dust around SNe is peculiar, SNe may be useful probes of the interstellar reddening laws in other galaxies.2015ApJ...805...74Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/805/74CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/sn : Asiago Supernova Catalogue (Barbon et al., 1999-)J/ApJ/799/105 : KELT light curve of the M82 SN 2014J (Siverd+, 2015)J/other/NewA/20.30 : BVRI light curves of 3 SN (Munari+, 2013)J/ApJ/742/89 : Relations between spectra and colors of SNe Ia (Foley+, 2011)J/ApJ/721/1608 : Absolute UV magnitudes of type Ia SNe (Brown+, 2010)J/AJ/139/120 : Low-redshift Type-Ia supernovae (Folatelli+, 2010)J/ApJS/185/32 : First-year SDSS-II SN results (Kessler+, 2009)J/ApJ/700/1097 : Light curve parameters of SN Ia (Hicken+, 2009)J/ApJ/699/L139 : Spectral parameters of SNe Ia (Wang+, 2009)J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009)J/ApJ/645/488 : SN type Ia luminosities (Wang+, 2006)http://people.physics.tamu.edu/pbrown/SwiftSN/swift_sn.html : Swift SNehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/805/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/805/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/805/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/805/74https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/805/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/805/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefaultJ/ApJ/805/74/table1SN2014J Swift/UVOT photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFiltSwift/UVOT filter (U, B, V, UVM2, UVW1 or UVW2)meta.notecharMJDModified Julian Date of observationdtime.epochdoublemag[10.7/21.2]? Observed Vega magnitude in Filtmagphot.magfloatnullablee_mag[0.02/0.4]? Uncertainty in magmagstat.error;phot.magfloatnullablemaglim[15.8/21.4] Magnitude limit in Filtmagphot.magfloatsatlim[10.5/12] Saturation limit in Filtmagphot.magfloatCRate[-0.02/737] Count rate in Filtct/sphot.count;em.UVfloate_CRate[0.006/20.1] Uncertainty in CRatect/sstat.errorfloat