Summary: SF2A 2007
J. Bouvier, A. Chalabaev, C. Charbonnel (eds)
THE SUPERNOVAE INTEGRAL FIELD SPECTROGRAPH : KEYS TO
C. Buton1, on behalf of the Nearby Supernova Factory, Y. Copin1, E. Gangler1, G. Smadja1, E.
Pecontal2, G. Rigaudier2, P. Antilogus3, S. Bailey3, R. Pain3, R. Pereira3, C. Wu3, G. Aldering4, C.
Aragon4, S. Bongard4, M. Childress4, S. Loken4, P. Nugent4, S. Perlmutter4, K. Runge4, R. C.
Thomas4, B. A. Weaver4 , C. Baltay5, A. Bauer5, D. Rabinowitz5 and R. Scalzo5
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.
The Nearby Supernova Factory (SNfactory, Aldering et al. 2002) is an international project dedicated to the