Speaker:
Rui Pereira (Institut de Physique Nucléaire de Lyon)
Abstract:
During the 2004-2008 period the Nearby Supernova Factory discovered ~1000 supernovae,
and obtained detailed spectrophotometric time series of ~190 SNe Ia with the SuperNova
Integral Field Spectrograph. These supernovae are located in the nearby Hubble flow (0.03 < z < 0.08),
allowing relative distance measurements with minimal uncertainties from peculiar velocities and
bulk flows. Each supernova was spectrophotometrically observed over a period of ~50 days, with a median
number of 15 observations per target. The first spectrum is typically obtained at -4 days, and in some
instances as early as -14 days before maximum light. Each spectrum (3200A - 10000A) is photometrically
calibrated, with simultaneous observations of field stars used to correct for atmospheric extinction variability.
In this talk I will present the SNfactory project and dataset, as well as recent results impacting the use of
SNe Ia as dark energy probes, notably a new spectral indicator able to standardize SNe Ia with a better
accuracy than light curve width and colour.
Place:
Sala de Vídeo-conferência, Centro de Congressos do IST, Pavilhão de Civil, Piso 01 (-1)
IST, Campus da Alameda