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The Supernovae Integral Field Spectrograph: keys to high-precision spectro-photometry

Buton, C. / Copin, Y. / Gangler, E. / Smadja, G. / Pecontal, E. / Rigaudier, G. / Antilogus, P. / Bailey, S. / Pain, R. / Pereira, R. / Wu, C. / Aldering, G. / Aragon, C. / Bongard, S. / Childress, M. / Loken, S. / Nugent, P. / Perlmutter, S. / Runge, K. / Thomas, R.C. / Weaver, B.A. / Baltay, C. / Bauer, A. / Rabinowitz, D. / Scalzo, R. - 2007
The Supernovae Integral Field Spectrograph: keys to a better spectro-photometry The Nearby Supernova Factory aims at discovering and observing a sample of type Ia supernovae through the dedicated Supernovae Integral Field Spectrograph, currently in operation since 2004 on Mauna-Kea UH telescope. To reach the targeted spectro-photometric accuracy, attention has been focused on various aspects of the calibration procedure, including: estimate of the night photometricity, derivation of the mean atmospheric extinction over the extended optical domain (320-1000 nm), its modeling in terms of physical components (Rayleigh and aerosol scatterings, ozone absorption and telluric lines) and its variability within a given night. Point-source extraction from the IFS datacube also requires a detailed knowledge of the atmospheric-induced point spread function (PSF). The overall accuracy of the calibration chain is estimated on reference flux standard stars.

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