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