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Optical and Near-Infrared Observations of the Highly Reddened, Rapidly Expanding Type Ia Supernova 2006X in M100 | | Xiaofeng Wang
; Weidong Li
; Alexei V. Filippenko
; Kevin Krisciunas
; Nicholas B. Suntzeff
; Junzheng Li
; Tianmeng Zhang
; Mohan Ganeshalingam
; Ryan J. Foley
; Tipei Li
; YuQing Lou
; Rencheng Shang
; Shuangnan Zhang
; Youhong Zhang
; | | Date: |
1 Aug 2007 | | Abstract: | We present extensive optical (UBVRI), near-infrared (JK) light curves and
optical spectroscopy of the Type Ia supernova (SN) 2006X in the nearby galaxy
NGC 4321 (M100). Our observations suggest that either SN 2006X has an
intrinsically peculiar color evolution, or it is highly reddened [$E(B -
V)_{host} = 1.41 pm 0.04$ mag] with $R_V = 1.48 pm 0.06$, much lower than the
canonical value of 3.1 for the average Galactic dust. SN 2006X also has one of
the highest expansion velocities ever published for a SN Ia. Compared with the
other SNe Ia we analyzed, SN 2006X has a broader light curve in the U band, a
more prominent bump/shoulder feature in the V and R bands, a more pronounced
secondary maximum in the I and near-infrared bands, and a remarkably smaller
late-time decline rate in the B band. The B-V color evolution shows an obvious
deviation from the Lira-Phillips relation at 1 to 3 months after maximum
brightness. At early times, optical spectra of SN 2006X displayed strong,
high-velocity features of both intermediate-mass elements (Si, Ca, and S) and
iron-peak elements, while at late times they showed a relatively blue
continuum, consistent with the blue U-B and B-V colors at similar epochs. A
light echo and/or the interaction of the SN ejecta and its circumstellar
material may provide a plausible explanation for its late-time photometric and
spectroscopic behavior. Using the Cepheid distance of M100, we derive a Hubble
constant of $72.7 pm 8.2$ km s^{-1} Mpc$^{-1}$ (statistical) from the
normalized dereddened luminosity of SN 2006X. We briefly discuss whether
abnormal dust is a universal signature for all SNe Ia, and whether the most
rapidly expanding objects form a subclass with distinct photometric and
spectroscopic properties. | | Source: | arXiv, 0708.0140 | | Services: | Forum | Review | PDF | Favorites | |
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