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Spectroscopic Observations of SN 2012fr: A Luminous Normal Type Ia Supernova with Early High Velocity Features and Late Velocity Plateau | | M. J. Childress
; R. A. Scalzo
; S. A. Sim
; B. E. Tucker
; F. Yuan
; B. P. Schmidt
; S. B. Cenko
; J. M. Silverman
; C. Contreras
; E. Y. Hsiao
; M. Phillips
; N. Morrell
; S. W. Jha
; C. McCully
; A. V. Filippenko
; J. P. Anderson
; S. Benetti
; F. Bufano
; T. de Jager
; F. Forster
; A. Gal-Yam
; L. Le Guillou
; K. Maguire
; J. Maund
; P. A. Mazzali
; G. Pignata
; S. Smartt
; J. Spyromilio
; M. Sullivan
; F. Taddia
; S. Valenti
; D. D. R. Bayliss
; M. Bessell
; D. J. Carson
; K. I. Clubb
; C. de Burgh-Day
; T. D. Desjardins
; J. J. Fang
; O. D. Fox
; E. L. Gates
; I-T. Ho
; S. Keller
; P. L. Kelly
; C. Lidman
; N. S. Loaring
; J. R. Mould
; M. Owers
; S. Ozbilgen
; L. Pei
; M. B. Pracy
; B. E. Schaefer
; N. Scott
; M. Stritzinger
; F. P. A. Vogt
; G. Zhou
; | | Date: |
12 Feb 2013 | | Abstract: | We present spectroscopic observations of the Type Ia supernova SN 2012fr,
comprising 50 optical spectra, of which 29 were obtained before maximum light,
and five near infrared spectra. At early times SN 2012fr shows clear evidence
of a high velocity feature (HVF) in the Si II 6355 line which can be cleanly
decoupled from the lower velocity photospheric component. This Si II 6355 HVF
fades by phase -5, then the photospheric component exhibits a very narrow
velocity width and remains at a nearly constant velocity of v~12,000 km/s until
at least 5 weeks post-maximum. The Ca II NIR triplet exhibits similar evidence
for both a photospheric component at v~12,000 km/s with narrow line width and
long velocity plateau, as well as a high velocity component beginning at
v~32,000 km/s two weeks before maximum. SN 2012fr resides on the border between
the "shallow silicon" and "core-normal" subclasses in the Branch et al. (2009)
classification scheme, and on the border between normal and "high-velocity" SNe
Ia in the Wang et al. (2009a) system. Though it is a clear member of the "low
velocity gradient" (LVG - Benetii et al., 2005) group of SNe Ia and exhibits a
very slow light curve decline, it shows key dissimilarities with the
overluminous SN 1991T or SN 1999aa subclasses of SNe Ia. SN 2012fr represents a
well observed SN Ia at the luminous end of the normal SN Ia distribution, and a
key transitional event between nominal spectroscopic subclasses of SNe Ia. | | Source: | arXiv, 1302.2926 | | Services: | Forum | Review | PDF | Favorites | |
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