SN 2012fr: Ultraviolet, Optical, and Near-infrared Light Curves of a Type Ia Supernova Observed within a Day of Explosion

• Autores: Contreras, Carlos; Phillips, M. M.; Burns, Christopher R.; Piro, Anthony L.; Shappee, B. J.; Stritzinger, Maximilian D.; Baltay, C.; Brown, Peter J.; Conseil, Emmanuel; Klotz, Alain; Nugent, Peter E.; Turpin, Damien; Parker, Stu; Rabinowitz, D.; Hsiao, Eric Y.; Morrell, Nidia Irene; Campillay, Abdo; Castellón, Sergio; Corco, Carlos; González, Consuelo; Krisciunas, Kevin; Serón, Jacqueline; Tucker, Brad E.; Walker, E.S.; Baron, E.; Cain, C.; Childress, Michael J.; Folatelli, Gaston; Freedman, Wendy L.; Hamuy, Mario; Hoeflich, P.; Persson, S. E.; Scalzo, Richard; Schmidt, Brian; Suntzeff, Nicholas B.
• Año de publicación: 2018
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: SUPERNOVAE: GENERAL; SUPERNOVAE: INDIVIDUAL (SN 2012FR)
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We 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 (). Supplementary imaging at the earliest epochs reveals an initial slow and nearly linear rise in luminosity with a duration of ∼2.5 days, followed by a faster rising phase that is well reproduced by an explosion model with a moderate amount of 56Ni 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 (λ > 1800) 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 o of 56Ni 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 λ6355 line at ∼12,000 that began ∼5 days before . 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.
Fil: Contreras, Carlos. Las Campanas Observatory; Chile. University Aarhus; Dinamarca
Fil: Phillips, M. M.. Las Campanas Observatory; Chile
Fil: Burns, Christopher R.. Carnegie Observatories; Chile
Fil: Piro, Anthony L.. Carnegie Observatories; Chile
Fil: Shappee, B. J.. Carnegie Observatories; Chile
Fil: Stritzinger, Maximilian D.. University Aarhus; Dinamarca
Fil: Baltay, C.. University of Yale; Estados Unidos
Fil: Brown, Peter J.. Texas A&M University; Estados Unidos
Fil: Conseil, Emmanuel. Association Francaise des Observateurs d’Etoiles Variables; Francia
Fil: Klotz, Alain. Université de Toulouse; Francia
Fil: Nugent, Peter E.. Lawrence Berkeley National Laboratory; Estados Unidos. University of California at Berkeley; Estados Unidos
Fil: Turpin, Damien. Université de Toulouse; Francia
Fil: Parker, Stu. Parkdale Observatory; Estados Unidos
Fil: Rabinowitz, D.. University of Yale; Estados Unidos
Fil: Hsiao, Eric Y.. Florida State University; Estados Unidos. Las Campanas Observatory; Chile. University Aarhus; Dinamarca
Fil: Morrell, Nidia Irene. Las Campanas Observatory; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Campillay, Abdo. Las Campanas Observatory; Chile. Universidad de La Serena; Chile
Fil: Castellón, Sergio. Las Campanas Observatory; Chile
Fil: Corco, Carlos. Las Campanas Observatory; Chile. Soar Telescope; Chile
Fil: González, Consuelo. Las Campanas Observatory; Chile
Fil: Krisciunas, Kevin. Texas A&M University; Estados Unidos
Fil: Serón, Jacqueline. Las Campanas Observatory; Chile. Cerro Tololo Inter American Observatory; Chile
Fil: Tucker, Brad E.. Australian National University; Australia
Fil: Walker, E.S.. Qriously Corporation; . University of Yale; Estados Unidos
Fil: Baron, E.. Homer L. Dodge Department Of Physics And Astronomy;
Fil: Cain, C.. Homer L. Dodge Department Of Physics And Astronomy;
Fil: Childress, Michael J.. University of Southampton; Reino Unido. Australian National University; Australia
Fil: Folatelli, Gaston. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Freedman, Wendy L.. University of Chicago; Estados Unidos
Fil: Hamuy, Mario. Universidad de Chile; Chile
Fil: Hoeflich, P.. Florida State University; Estados Unidos
Fil: Persson, S. E.. Carnegie Observatories; Chile
Fil: Scalzo, Richard. Australian National University; Australia. The University Of Sydney; Australia
Fil: Schmidt, Brian. Australian National University; Australia
Fil: Suntzeff, Nicholas B.. Texas A&M University; Estados Unidos