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dc.creatorPhillips, Mark M.en_US
dc.creatorSimon, Joshua D.en_US
dc.creatorMorrell, Nidiaen_US
dc.creatorBurns, Christopher R.en_US
dc.creatorCox, Nick L. J.en_US
dc.creatorFoley, Ryan J.en_US
dc.creatorKarakas, Amanda I.en_US
dc.creatorPatat, F.en_US
dc.creatorSternberg, Assafen_US
dc.creatorWilliams, R. E.en_US
dc.creatorGal-Yam, Avishayen_US
dc.creatorHsiao, Eric Y.en_US
dc.creatorLeonard, D. C.en_US
dc.creatorPersson, Sven E.en_US
dc.creatorStritzinger, Maximilianen_US
dc.creatorThompson, Ian B.en_US
dc.creatorCampillay, Abdoen_US
dc.creatorContreras, Carlosen_US
dc.creatorFolatelli, Gastonen_US
dc.creatorFreedman, Wendy L.en_US
dc.creatorHamuy, Marioen_US
dc.creatorRoth, Miguelen_US
dc.creatorShields, Gregory A.en_US
dc.creatorSuntzeff, Nicholas B.en_US
dc.creatorChomiuk, Lauraen_US
dc.creatorIvans, Inese I.en_US
dc.creatorMadore, Barry F.en_US
dc.creatorPenprase, B. E.en_US
dc.creatorPerley, Danielen_US
dc.creatorPignata, G.en_US
dc.creatorPreston, G.en_US
dc.creatorSoderberg, Alicia M.en_US
dc.date.accessioned2016-04-28T19:34:15Z
dc.date.available2016-04-28T19:34:15Z
dc.date.issued2013-12en
dc.identifierdoi:10.15781/T21V5W
dc.identifier.citationPhillips, Mark M., Joshua D. Simon, Nidia Morrell, Christopher R. Burns, Nick LJ Cox, Ryan J. Foley, Amanda I. Karakas et al. "On the source of the dust extinction in type Ia supernovae and the discovery of anomalously strong Na i absorption." The Astrophysical Journal, Vol. 779, No. 1 (Dec., 2013): 38.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34772
dc.description.abstractHigh-dispersion observations of the Na I D lambda lambda 5890, 5896 and K I lambda lambda 7665, 7699 interstellar lines, and the diffuse interstellar band at 5780 angstrom in the spectra of 32 Type Ia supernovae are used as an independent means of probing dust extinction. We show that the dust extinction of the objects where the diffuse interstellar band at 5780 angstrom is detected is consistent with the visual extinction derived from the supernova colors. This strongly suggests that the dust producing the extinction is predominantly located in the interstellar medium of the host galaxies and not in circumstellar material associated with the progenitor system. One quarter of the supernovae display anomalously large Na I column densities in comparison to the amount of dust extinction derived from their colors. Remarkably, all of the cases of unusually strong Na I D absorption correspond to "Blueshifted" profiles in the classification scheme of Sternberg et al. This coincidence suggests that outflowing circumstellar gas is responsible for at least some of the cases of anomalously large Na I column densities. Two supernovae with unusually strong Na I D absorption showed essentially normal K I column densities for the dust extinction implied by their colors, but this does not appear to be a universal characteristic. Overall, we find the most accurate predictor of individual supernova extinction to be the equivalent width of the diffuse interstellar band at 5780 angstrom, and provide an empirical relation for its use. Finally, we identify ways of producing significant enhancements of the Na abundance of circumstellar material in both the single-degenerate and double-degenerate scenarios for the progenitor system.en_US
dc.description.sponsorshipNational Science Foundation AST0306969, AST0607438, AST1008343en_US
dc.description.sponsorshipNSF 1066293en_US
dc.description.sponsorshipAustralian Research Council FT110100475en_US
dc.description.sponsorshipEU/FP7 via an ERC granten_US
dc.description.sponsorshipKimmel Award for innovative Investigationen_US
dc.description.sponsorshipDanish Agency for Science and Technology and Innovationen_US
dc.description.sponsorshipMillennium Center for Supernova Science P10-064-Fen_US
dc.description.sponsorshipAhmanson Foundationen_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectcircumstellar matteren_US
dc.subjectdust, extinctionen_US
dc.subjectgalaxies: ismen_US
dc.subjectsupernovae:en_US
dc.subjectgeneralen_US
dc.subjectdiffuse interstellar bandsen_US
dc.subjectgiant branch starsen_US
dc.subjectphotometry data releaseen_US
dc.subjectsmall-magellanic-clouden_US
dc.subjectcircumstellar materialen_US
dc.subjectca-iien_US
dc.subjectinfrareden_US
dc.subjectphotometryen_US
dc.subjectsodium-absorptionen_US
dc.subjectlight curvesen_US
dc.subjectsn 2011feen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleOn The Source Of The Dust Extinction In Type Ia Supernovae And The Discovery Of Anomalously Strong Na I Absorptionen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2013_12_dustextinction.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/779/1/38en_US
dc.contributor.utaustinauthorShields, Gregory A.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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