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On the Source of the Dust Extinction in Type Ia Supernovae and the Discovery of Anomalously Strong Na I Absorption

Authordc.contributor.authorPhillips, M. M. 
Authordc.contributor.authorSimon, Joshua D. 
Authordc.contributor.authorMorrell, Nidia 
Authordc.contributor.authorBurns, Christopher R. 
Authordc.contributor.authorCox, Nick 
Authordc.contributor.authorFoley, Ryan J. 
Authordc.contributor.authorKarakas, Amanda 
Authordc.contributor.authorPatat, F. 
Authordc.contributor.authorSternberg, A. 
Authordc.contributor.authorWilliams, R. 
Authordc.contributor.authorGal Yam, Avishay 
Authordc.contributor.authorHsiao, Eric 
Authordc.contributor.authorLeonard, D. 
Authordc.contributor.authorPersson, Sven 
Authordc.contributor.authorStritzinger, Maximilian 
Authordc.contributor.authorThompson, I. 
Authordc.contributor.authorCampillay, Abdo 
Authordc.contributor.authorContreras, Carlos 
Authordc.contributor.authorFolatelli, Gastón 
Authordc.contributor.authorFreedman, Wendy L. 
Authordc.contributor.authorHamuy Wackenhut, Mario 
Authordc.contributor.authorRoth, Miguel 
Authordc.contributor.authorShields, Gregory 
Authordc.contributor.authorSuntzeff, Nicholas B. 
Authordc.contributor.authorChomiuk, Laura 
Authordc.contributor.authorIvans, Inese 
Authordc.contributor.authorMadore, Barry 
Authordc.contributor.authorPenprase, B. 
Authordc.contributor.authorPerley, Daniel 
Authordc.contributor.authorPignata Libralato, Giuliano 
Authordc.contributor.authorPreston, G. 
Authordc.contributor.authorSoderberg, Alicia 
Cita de ítemdc.identifier.citationThe Astrophysical Journal, 779:38 (21pp), 2013 December 10en_US
General notedc.descriptionArtículo de publicación ISIen_US
Abstractdc.description.abstractHigh-dispersion observations of the Na i D λλ5890, 5896 and K i λλ7665, 7699 interstellar lines, and the diffuse interstellar band at 5780 Å 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 Å 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 Å, 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
Publisherdc.publisherThe American Astronomical Societyen_US
Type of licensedc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
Link to Licensedc.rights.uri*
Keywordsdc.subjectCircumstellar matteren_US
Keywordsdc.subjectDust, extinctionen_US
Keywordsdc.subjectGalaxies: ISMen_US
Keywordsdc.subjectSupernovae: generalen_US
Títulodc.titleOn the Source of the Dust Extinction in Type Ia Supernovae and the Discovery of Anomalously Strong Na I Absorptionen_US
Document typedc.typeArtículo de revistaen_US

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Atribución-NoComercial-SinDerivadas 3.0 Chile
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 Chile