Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360308h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #603.08
Astronomy and Astrophysics
Astronomy
Scientific paper
The photometric studies of Type Ia supernovae (SNe Ia) in the optical have demonstrated that they can be calibrated to be standard candles. More remarkably, they may be considered true standard candles in the near-infrared. An accurate set of spectral template time series and descriptions of their diversity are critical for these studies. We present a set of spectral templates produced by combining a large sample of observed spectra and light curves using methods developed by Hsiao et al. (2007). The method combines spectra in a consistent manner across wavelength and epoch. The current set of templates is extended to the near-infrared by including 51 near-infrared spectra. It ranges from 0.1 to 2.5 micron in wavelength and from -20 to 80 days with respect to time of maximum B band flux in epoch. The effect of the inhomogeneity in the spectral features is also quantified. As in the optical, the spectroscopic evolution of SNe Ia is shown to be quite uniform in the near-infrared. This uniformity further validates the use of near-infrared luminosity of SNe Ia as standard candles.
Boldt Luis
Hsiao Eric
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