Type Ia Supernova Spectral Line Ratios as Luminosity Indicators: "From Phenomenology to Radiative Transfer and Back Again"

Details Type Ia Supernova Spectral Line Ratios as Luminosity Indicators: "From Phenomenology to Radiative Transfer and Back Again" Type Ia Supernova Spectral Line Ratios as Luminosity Indicators: "From Phenomenology to Radiative Transfer and Back Again"

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20920001b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #200.01; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Type Ia supernovae have played a crucial role in the discovery of the dark energy, via the measurement of their light curves and the determination of the peak brightness via fitting templates to the observed lightcurve shape. Two spectroscopic indicators (RSi and RCa) are also known to be well correlated with peak luminosity. Since the spectroscopic luminosity indicators are obtained directly from observed spectra, they may emphasize different aspects on the intrinsic scatter and will have different systematic errors than do measurements using photometry. We present new variants of such spectroscopic indicators which are easy to automate and which minimize the effects of noise. Using the radiative transfer code PHOENIX, we isolate the main spectral contributions to the RSi wavelength region and propose an explanation for the counterintuitive correlation of this spectral indicator with luminosity. Based on these results we introduce RSiS, a new spectral indicator which correlation with luminosity is twice as good as RSi. Finally, we quantify the accuracy of the measure of SNeIa peak brightness with these indicators in the context of SNAP/JDEM.

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