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

  • Author(s): Contreras, C
  • Phillips, MM
  • Burns, CR
  • Piro, AL
  • Shappee, BJ
  • Stritzinger, MD
  • Baltay, C
  • Brown, PJ
  • Conseil, E
  • Klotz, A
  • Nugent, PE
  • Turpin, D
  • Parker, S
  • Rabinowitz, D
  • Hsiao, EY
  • Morrell, N
  • Campillay, A
  • Castellón, S
  • Corco, C
  • González, C
  • Krisciunas, K
  • Serón, J
  • Tucker, BE
  • Walker, ES
  • Baron, E
  • Cain, C
  • Childress, MJ
  • Folatelli, G
  • Freedman, WL
  • Hamuy, M
  • Hoeflich, P
  • Persson, SE
  • Scalzo, R
  • Schmidt, B
  • Suntzeff, NB
  • et al.

Published Web Location

https://arxiv.org/pdf/1803.10095
No data is associated with this publication.
Abstract

© 2018. The American Astronomical Society. All rights reserved.. 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 of56Ni 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 Moof56Ni 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.

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