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SN 2012fr: ultraviolet, optical, and near-infrared light curves of a type Ia supernova observed within a day of explosion

Autordc.contributor.authorContreras, Carlos 
Autordc.contributor.authorHamuy Wackenhut, Mario 
Fecha de publicació
Cita de ítemdc.identifier.citationThe Astrophysical Journal, 859:24 (41pp), 2018 May 20es_ES
Resumendc.description.abstractWe present detailed ultraviolet, optical, and near-infrared light curves of the Type Ia supernova (SN) 2012fr, which exploded in the Fornax cluster member NGC 1365. These precise high-cadence light curves provide a dense coverage of the flux evolution from -12 to +140 days with respect to the epoch of B-band maximum (t(Bmax)). Supplementary imaging at the earliest epochs reveals an initial slow and nearly linear rise in luminosity with a duration of similar to 2.5 days, followed by a faster rising phase that is well reproduced by an explosion model with a moderate amount of Ni-56 mixing in the ejecta. From our analysis of the light curves, we conclude that: (i) the explosion occurred <22 hr before the first detection of the supernova, (ii) the rise time to peak bolometric (lambda > 1800 angstrom) luminosity was 16.5 +/- 0.6 days, (iii) the supernova suffered little or no host-galaxy dust reddening, (iv) the peak luminosity in both the optical and near-infrared was consistent with the bright end of normal Type Ia diversity, and (v) 0.60 +/- 0.15 M-circle dot of Ni-56 was synthesized in the explosion. Despite its normal luminosity, SN 2012fr displayed unusually prevalent high-velocity Ca II and Si II absorption features, and a nearly constant photospheric velocity of the Si II lambda 6355 line at similar to 12,000 km s(-1) that began similar to 5 days before t(Bmax) We also highlight some of the other peculiarities in the early phase photometry and the spectral evolution. SN 2012fr also adds to a growing number of Type Ia supernovae that are hosted by galaxies with direct Cepheid distance measurements.es_ES
Patrocinadordc.description.sponsorshipl Science Foundation AST0306969 AST0607438 AST1008343 AST1613426 AST1613455 AST1613472 Danish Agency for Science and Technology and Innovation through a Sapere Aude Level 2 grant Florida Space Grant Consortium VILLUM FONDEN 13261es_ES
Publicadordc.publisherThe American Astronomical Societyes_ES
Tipo de licenciadc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link a Licenciadc.rights.uri*
Fuentedc.sourceThe Astrophysical Journales_ES
Palabras clavesdc.subjectSupernovae: generales_ES
Palabras clavesdc.subjectSupernovae: individual (SN 2012fr)es_ES
Títulodc.titleSN 2012fr: ultraviolet, optical, and near-infrared light curves of a type Ia supernova observed within a day of explosiones_ES
Tipo de documentodc.typeArtículo de revistaes_ES
Indizaciónuchile.indexArtículo de publicación ISIes_ES

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Attribution-NonCommercial-NoDerivs 3.0 Chile
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